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From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: Managed storage with KVM
Date Wed, 18 Sep 2013 02:01:05 GMT
Plus, when you log in to a LUN, you need the CHAP info and this info is
required for each LUN (as opposed to being for the SAN).

This is how my createStoragePool currently looks, so I think we're on the
same page.


public KVMStoragePool createStoragePool(String name, String host, int port,
String path, String userInfo, StoragePoolType type) {

        iScsiAdmStoragePool storagePool = new iScsiAdmStoragePool(name,
host, port, this);

        _mapUuidToAdaptor.put(name, storagePool);

        return storagePool;

    }


On Tue, Sep 17, 2013 at 7:34 PM, Marcus Sorensen <shadowsor@gmail.com>wrote:

> What do you do with Xen? I imagine the user enter the SAN details when
> registering the pool? A the pool details are basically just instructions on
> how to log into a target, correct?
>
> You can choose to log in a KVM host to the target during createStoragePool
> and save the pool in a map, or just save the pool info in a map for future
> reference by uuid, for when you do need to log in. The createStoragePool
> then just becomes a way to save the pool info to the agent. Personally, I'd
> log in on the pool create and look/scan for specific luns when they're
> needed, but I haven't thought it through thoroughly. I just say that mainly
> because login only happens once, the first time the pool is used, and every
> other storage command is about discovering new luns or maybe
> deleting/disconnecting luns no longer needed. On the other hand, you could
> do all of the above: log in on pool create, then also check if you're
> logged in on other commands and log in if you've lost connection.
>
> With Xen, what does your registered pool   show in the UI for avail/used
> capacity, and how does it get that info? I assume there is some sort of
> disk pool that the luns are carved from, and that your plugin is called to
> talk to the SAN and expose to the user how much of that pool has been
> allocated. Knowing how you already solves these problems with Xen will help
> figure out what to do with KVM.
>
> If this is the case, I think the plugin can continue to handle it rather
> than getting details from the agent. I'm not sure if that means nulls are
> OK for these on the agent side or what, I need to look at the storage
> plugin arch more closely.
> On Sep 17, 2013 7:08 PM, "Mike Tutkowski" <mike.tutkowski@solidfire.com>
> wrote:
>
> > Hey Marcus,
> >
> > I'm reviewing your e-mails as I implement the necessary methods in new
> > classes.
> >
> > "So, referencing StorageAdaptor.java, createStoragePool accepts all of
> > the pool data (host, port, name, path) which would be used to log the
> > host into the initiator."
> >
> > Can you tell me, in my case, since a storage pool (primary storage) is
> > actually the SAN, I wouldn't really be logging into anything at this
> point,
> > correct?
> >
> > Also, what kind of capacity, available, and used bytes make sense to
> report
> > for KVMStoragePool (since KVMStoragePool represents the SAN in my case
> and
> > not an individual LUN)?
> >
> > Thanks!
> >
> >
> > On Fri, Sep 13, 2013 at 11:42 PM, Marcus Sorensen <shadowsor@gmail.com
> > >wrote:
> >
> > > Ok, KVM will be close to that, of course, because only the hypervisor
> > > classes differ, the rest is all mgmt server. Creating a volume is just
> > > a db entry until it's deployed for the first time. AttachVolumeCommand
> > > on the agent side (LibvirtStorageAdaptor.java is analogous to
> > > CitrixResourceBase.java) will do the iscsiadm commands (via a KVM
> > > StorageAdaptor) to log in the host to the target and then you have a
> > > block device.  Maybe libvirt will do that for you, but my quick read
> > > made it sound like the iscsi libvirt pool type is actually a pool, not
> > > a lun or volume, so you'll need to figure out if that works or if
> > > you'll have to use iscsiadm commands.
> > >
> > > If you're NOT going to use LibvirtStorageAdaptor (because Libvirt
> > > doesn't really manage your pool the way you want), you're going to
> > > have to create a version of KVMStoragePool class and a StorageAdaptor
> > > class (see LibvirtStoragePool.java and LibvirtStorageAdaptor.java),
> > > implementing all of the methods, then in KVMStorageManager.java
> > > there's a "_storageMapper" map. This is used to select the correct
> > > adaptor, you can see in this file that every call first pulls the
> > > correct adaptor out of this map via getStorageAdaptor. So you can see
> > > a comment in this file that says "add other storage adaptors here",
> > > where it puts to this map, this is where you'd register your adaptor.
> > >
> > > So, referencing StorageAdaptor.java, createStoragePool accepts all of
> > > the pool data (host, port, name, path) which would be used to log the
> > > host into the initiator. I *believe* the method getPhysicalDisk will
> > > need to do the work of attaching the lun.  AttachVolumeCommand calls
> > > this and then creates the XML diskdef and attaches it to the VM. Now,
> > > one thing you need to know is that createStoragePool is called often,
> > > sometimes just to make sure the pool is there. You may want to create
> > > a map in your adaptor class and keep track of pools that have been
> > > created, LibvirtStorageAdaptor doesn't have to do this because it asks
> > > libvirt about which storage pools exist. There are also calls to
> > > refresh the pool stats, and all of the other calls can be seen in the
> > > StorageAdaptor as well. There's a createPhysical disk, clone, etc, but
> > > it's probably a hold-over from 4.1, as I have the vague idea that
> > > volumes are created on the mgmt server via the plugin now, so whatever
> > > doesn't apply can just be stubbed out (or optionally
> > > extended/reimplemented here, if you don't mind the hosts talking to
> > > the san api).
> > >
> > > There is a difference between attaching new volumes and launching a VM
> > > with existing volumes.  In the latter case, the VM definition that was
> > > passed to the KVM agent includes the disks, (StartCommand).
> > >
> > > I'd be interested in how your pool is defined for Xen, I imagine it
> > > would need to be kept the same. Is it just a definition to the SAN
> > > (ip address or some such, port number) and perhaps a volume pool name?
> > >
> > > > If there is a way for me to update the ACL list on the SAN to have
> > only a
> > > > single KVM host have access to the volume, that would be ideal.
> > >
> > > That depends on your SAN API.  I was under the impression that the
> > > storage plugin framework allowed for acls, or for you to do whatever
> > > you want for create/attach/delete/snapshot, etc. You'd just call your
> > > SAN API with the host info for the ACLs prior to when the disk is
> > > attached (or the VM is started).  I'd have to look more at the
> > > framework to know the details, in 4.1 I would do this in
> > > getPhysicalDisk just prior to connecting up the LUN.
> > >
> > >
> > > On Fri, Sep 13, 2013 at 10:27 PM, Mike Tutkowski
> > > <mike.tutkowski@solidfire.com> wrote:
> > > > OK, yeah, the ACL part will be interesting. That is a bit different
> > from
> > > how
> > > > it works with XenServer and VMware.
> > > >
> > > > Just to give you an idea how it works in 4.2 with XenServer:
> > > >
> > > > * The user creates a CS volume (this is just recorded in the
> > > cloud.volumes
> > > > table).
> > > >
> > > > * The user attaches the volume as a disk to a VM for the first time
> (if
> > > the
> > > > storage allocator picks the SolidFire plug-in, the storage framework
> > > invokes
> > > > a method on the plug-in that creates a volume on the SAN...info like
> > the
> > > IQN
> > > > of the SAN volume is recorded in the DB).
> > > >
> > > > * CitrixResourceBase's execute(AttachVolumeCommand) is executed. It
> > > > determines based on a flag passed in that the storage in question is
> > > > "CloudStack-managed" storage (as opposed to "traditional"
> preallocated
> > > > storage). This tells it to discover the iSCSI target. Once discovered
> > it
> > > > determines if the iSCSI target already contains a storage repository
> > (it
> > > > would if this were a re-attach situation). If it does contain an SR
> > > already,
> > > > then there should already be one VDI, as well. If there is no SR, an
> SR
> > > is
> > > > created and a single VDI is created within it (that takes up about as
> > > much
> > > > space as was requested for the CloudStack volume).
> > > >
> > > > * The normal attach-volume logic continues (it depends on the
> existence
> > > of
> > > > an SR and a VDI).
> > > >
> > > > The VMware case is essentially the same (mainly just substitute
> > datastore
> > > > for SR and VMDK for VDI).
> > > >
> > > > In both cases, all hosts in the cluster have discovered the iSCSI
> > target,
> > > > but only the host that is currently running the VM that is using the
> > VDI
> > > (or
> > > > VMKD) is actually using the disk.
> > > >
> > > > Live Migration should be OK because the hypervisors communicate with
> > > > whatever metadata they have on the SR (or datastore).
> > > >
> > > > I see what you're saying with KVM, though.
> > > >
> > > > In that case, the hosts are clustered only in CloudStack's eyes. CS
> > > controls
> > > > Live Migration. You don't really need a clustered filesystem on the
> > LUN.
> > > The
> > > > LUN could be handed over raw to the VM using it.
> > > >
> > > > If there is a way for me to update the ACL list on the SAN to have
> > only a
> > > > single KVM host have access to the volume, that would be ideal.
> > > >
> > > > Also, I agree I'll need to use iscsiadm to discover and log in to the
> > > iSCSI
> > > > target. I'll also need to take the resultant new device and pass it
> > into
> > > the
> > > > VM.
> > > >
> > > > Does this sound reasonable? Please call me out on anything I seem
> > > incorrect
> > > > about. :)
> > > >
> > > > Thanks for all the thought on this, Marcus!
> > > >
> > > >
> > > > On Fri, Sep 13, 2013 at 8:25 PM, Marcus Sorensen <
> shadowsor@gmail.com>
> > > > wrote:
> > > >>
> > > >> Perfect. You'll have a domain def ( the VM), a disk def, and the
> > attach
> > > >> the disk def to the vm. You may need to do your own StorageAdaptor
> and
> > > run
> > > >> iscsiadm commands to accomplish that, depending on how the libvirt
> > iscsi
> > > >> works. My impression is that a 1:1:1 pool/lun/volume isn't how it
> > works
> > > on
> > > >> xen at the momen., nor is it ideal.
> > > >>
> > > >> Your plugin will handle acls as far as which host can see which luns
> > as
> > > >> well, I remember discussing that months ago, so that a disk won't be
> > > >> connected until the hypervisor has exclusive access, so it will be
> > safe
> > > and
> > > >> fence the disk from rogue nodes that cloudstack loses connectivity
> > > with. It
> > > >> should revoke access to everything but the target host... Except for
> > > during
> > > >> migration but we can discuss that later, there's a migration prep
> > > process
> > > >> where the new host can be added to the acls, and the old host can be
> > > removed
> > > >> post migration.
> > > >>
> > > >> On Sep 13, 2013 8:16 PM, "Mike Tutkowski" <
> > mike.tutkowski@solidfire.com
> > > >
> > > >> wrote:
> > > >>>
> > > >>> Yeah, that would be ideal.
> > > >>>
> > > >>> So, I would still need to discover the iSCSI target, log in to it,
> > then
> > > >>> figure out what /dev/sdX was created as a result (and leave it as
> is
> > -
> > > do
> > > >>> not format it with any file system...clustered or not). I would
> pass
> > > that
> > > >>> device into the VM.
> > > >>>
> > > >>> Kind of accurate?
> > > >>>
> > > >>>
> > > >>> On Fri, Sep 13, 2013 at 8:07 PM, Marcus Sorensen <
> > shadowsor@gmail.com>
> > > >>> wrote:
> > > >>>>
> > > >>>> Look in LibvirtVMDef.java (I think) for the disk definitions.
> There
> > > are
> > > >>>> ones that work for block devices rather than files. You can piggy
> > > back off
> > > >>>> of the existing disk definitions and attach it to the vm as a
> block
> > > device.
> > > >>>> The definition is an XML string per libvirt XML format. You may
> want
> > > to use
> > > >>>> an alternate path to the disk rather than just /dev/sdx like I
> > > mentioned,
> > > >>>> there are by-id paths to the block devices, as well as other ones
> > > that will
> > > >>>> be consistent and easier for management, not sure how familiar you
> > > are with
> > > >>>> device naming on Linux.
> > > >>>>
> > > >>>> On Sep 13, 2013 8:00 PM, "Marcus Sorensen" <shadowsor@gmail.com>
> > > wrote:
> > > >>>>>
> > > >>>>> No, as that would rely on virtualized network/iscsi initiator
> > inside
> > > >>>>> the vm, which also sucks. I mean attach /dev/sdx (your lun on
> > > hypervisor) as
> > > >>>>> a disk to the VM, rather than attaching some image file that
> > resides
> > > on a
> > > >>>>> filesystem, mounted on the host, living on a target.
> > > >>>>>
> > > >>>>> Actually, if you plan on the storage supporting live migration I
> > > think
> > > >>>>> this is the only way. You can't put a filesystem on it and mount
> it
> > > in two
> > > >>>>> places to facilitate migration unless its a clustered filesystem,
> > in
> > > which
> > > >>>>> case you're back to shared mount point.
> > > >>>>>
> > > >>>>> As far as I'm aware, the xenserver SR style is basically LVM
> with a
> > > xen
> > > >>>>> specific cluster management, a custom CLVM. They don't use a
> > > filesystem
> > > >>>>> either.
> > > >>>>>
> > > >>>>> On Sep 13, 2013 7:44 PM, "Mike Tutkowski"
> > > >>>>> <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>
> > > >>>>>> When you say, "wire up the lun directly to the vm," do you mean
> > > >>>>>> circumventing the hypervisor? I didn't think we could do that in
> > CS.
> > > >>>>>> OpenStack, on the other hand, always circumvents the hypervisor,
> > as
> > > far as I
> > > >>>>>> know.
> > > >>>>>>
> > > >>>>>>
> > > >>>>>> On Fri, Sep 13, 2013 at 7:40 PM, Marcus Sorensen <
> > > shadowsor@gmail.com>
> > > >>>>>> wrote:
> > > >>>>>>>
> > > >>>>>>> Better to wire up the lun directly to the vm unless there is a
> > good
> > > >>>>>>> reason not to.
> > > >>>>>>>
> > > >>>>>>> On Sep 13, 2013 7:40 PM, "Marcus Sorensen" <
> shadowsor@gmail.com>
> > > >>>>>>> wrote:
> > > >>>>>>>>
> > > >>>>>>>> You could do that, but as mentioned I think its a mistake to
> go
> > to
> > > >>>>>>>> the trouble of creating a 1:1 mapping of CS volumes to luns
> and
> > > then putting
> > > >>>>>>>> a filesystem on it, mounting it, and then putting a QCOW2 or
> > even
> > > RAW disk
> > > >>>>>>>> image on that filesystem. You'll lose a lot of iops along the
> > > way, and have
> > > >>>>>>>> more overhead with the filesystem and its journaling, etc.
> > > >>>>>>>>
> > > >>>>>>>> On Sep 13, 2013 7:33 PM, "Mike Tutkowski"
> > > >>>>>>>> <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>
> > > >>>>>>>>> Ah, OK, I didn't know that was such new ground in KVM with
> CS.
> > > >>>>>>>>>
> > > >>>>>>>>> So, the way people use our SAN with KVM and CS today is by
> > > >>>>>>>>> selecting SharedMountPoint and specifying the location of the
> > > share.
> > > >>>>>>>>>
> > > >>>>>>>>> They can set up their share using Open iSCSI by discovering
> > their
> > > >>>>>>>>> iSCSI target, logging in to it, then mounting it somewhere on
> > > their file
> > > >>>>>>>>> system.
> > > >>>>>>>>>
> > > >>>>>>>>> Would it make sense for me to just do that discovery, logging
> > in,
> > > >>>>>>>>> and mounting behind the scenes for them and letting the
> current
> > > code manage
> > > >>>>>>>>> the rest as it currently does?
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>> On Fri, Sep 13, 2013 at 7:27 PM, Marcus Sorensen
> > > >>>>>>>>> <shadowsor@gmail.com> wrote:
> > > >>>>>>>>>>
> > > >>>>>>>>>> Oh, hypervisor snapshots are a bit different. I need to
> catch
> > up
> > > >>>>>>>>>> on the work done in KVM, but this is basically just disk
> > > snapshots + memory
> > > >>>>>>>>>> dump. I still think disk snapshots would preferably be
> handled
> > > by the SAN,
> > > >>>>>>>>>> and then memory dumps can go to secondary storage or
> something
> > > else. This is
> > > >>>>>>>>>> relatively new ground with CS and KVM, so we will want to
> see
> > > how others are
> > > >>>>>>>>>> planning theirs.
> > > >>>>>>>>>>
> > > >>>>>>>>>> On Sep 13, 2013 7:20 PM, "Marcus Sorensen" <
> > shadowsor@gmail.com
> > > >
> > > >>>>>>>>>> wrote:
> > > >>>>>>>>>>>
> > > >>>>>>>>>>> Let me back up and say I don't think you'd use a vdi style
> on
> > > an
> > > >>>>>>>>>>> iscsi lun. I think you'd want to treat it as a RAW format.
> > > Otherwise you're
> > > >>>>>>>>>>> putting a filesystem on your lun, mounting it, creating a
> > > QCOW2 disk image,
> > > >>>>>>>>>>> and that seems unnecessary and a performance killer.
> > > >>>>>>>>>>>
> > > >>>>>>>>>>> So probably attaching the raw iscsi lun as a disk to the
> VM,
> > > and
> > > >>>>>>>>>>> handling snapshots on the San side via the storage plugin
> is
> > > best. My
> > > >>>>>>>>>>> impression from the storage plugin refactor was that there
> > was
> > > a snapshot
> > > >>>>>>>>>>> service that would allow the San to handle snapshots.
> > > >>>>>>>>>>>
> > > >>>>>>>>>>> On Sep 13, 2013 7:15 PM, "Marcus Sorensen" <
> > > shadowsor@gmail.com>
> > > >>>>>>>>>>> wrote:
> > > >>>>>>>>>>>>
> > > >>>>>>>>>>>> Ideally volume snapshots can be handled by the SAN back
> end,
> > > if
> > > >>>>>>>>>>>> the SAN supports it. The cloudstack mgmt server could call
> > > your plugin for
> > > >>>>>>>>>>>> volume snapshot and it would be hypervisor agnostic. As
> far
> > > as space, that
> > > >>>>>>>>>>>> would depend on how your SAN handles it. With ours, we
> carve
> > > out luns from a
> > > >>>>>>>>>>>> pool, and the snapshot spave comes from the pool and is
> > > independent of the
> > > >>>>>>>>>>>> LUN size the host sees.
> > > >>>>>>>>>>>>
> > > >>>>>>>>>>>> On Sep 13, 2013 7:10 PM, "Mike Tutkowski"
> > > >>>>>>>>>>>> <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> Hey Marcus,
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> I wonder if the iSCSI storage pool type for libvirt won't
> > > work
> > > >>>>>>>>>>>>> when you take into consideration hypervisor snapshots?
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> On XenServer, when you take a hypervisor snapshot, the
> VDI
> > > for
> > > >>>>>>>>>>>>> the snapshot is placed on the same storage repository as
> > the
> > > volume is on.
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> Same idea for VMware, I believe.
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> So, what would happen in my case (let's say for XenServer
> > and
> > > >>>>>>>>>>>>> VMware for 4.3 because I don't support hypervisor
> snapshots
> > > in 4.2) is I'd
> > > >>>>>>>>>>>>> make an iSCSI target that is larger than what the user
> > > requested for the
> > > >>>>>>>>>>>>> CloudStack volume (which is fine because our SAN thinly
> > > provisions volumes,
> > > >>>>>>>>>>>>> so the space is not actually used unless it needs to be).
> > > The CloudStack
> > > >>>>>>>>>>>>> volume would be the only "object" on the SAN volume
> until a
> > > hypervisor
> > > >>>>>>>>>>>>> snapshot is taken. This snapshot would also reside on the
> > > SAN volume.
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> If this is also how KVM behaves and there is no creation
> of
> > > >>>>>>>>>>>>> LUNs within an iSCSI target from libvirt (which, even if
> > > there were support
> > > >>>>>>>>>>>>> for this, our SAN currently only allows one LUN per iSCSI
> > > target), then I
> > > >>>>>>>>>>>>> don't see how using this model will work.
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> Perhaps I will have to go enhance the current way this
> > works
> > > >>>>>>>>>>>>> with DIR?
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> What do you think?
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> Thanks
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> On Fri, Sep 13, 2013 at 6:28 PM, Mike Tutkowski
> > > >>>>>>>>>>>>> <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>> That appears to be the way it's used for iSCSI access
> > today.
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>> I suppose I could go that route, too, but I might as
> well
> > > >>>>>>>>>>>>>> leverage what libvirt has for iSCSI instead.
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>> On Fri, Sep 13, 2013 at 6:26 PM, Marcus Sorensen
> > > >>>>>>>>>>>>>> <shadowsor@gmail.com> wrote:
> > > >>>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>>> To your question about SharedMountPoint, I believe it
> > just
> > > >>>>>>>>>>>>>>> acts like a
> > > >>>>>>>>>>>>>>> 'DIR' storage type or something similar to that. The
> > > end-user
> > > >>>>>>>>>>>>>>> is
> > > >>>>>>>>>>>>>>> responsible for mounting a file system that all KVM
> hosts
> > > can
> > > >>>>>>>>>>>>>>> access,
> > > >>>>>>>>>>>>>>> and CloudStack is oblivious to what is providing the
> > > storage.
> > > >>>>>>>>>>>>>>> It could
> > > >>>>>>>>>>>>>>> be NFS, or OCFS2, or some other clustered filesystem,
> > > >>>>>>>>>>>>>>> cloudstack just
> > > >>>>>>>>>>>>>>> knows that the provided directory path has VM images.
> > > >>>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>>> On Fri, Sep 13, 2013 at 6:23 PM, Marcus Sorensen
> > > >>>>>>>>>>>>>>> <shadowsor@gmail.com> wrote:
> > > >>>>>>>>>>>>>>> > Oh yes, you can use NFS, LVM, and iSCSI all at the
> same
> > > >>>>>>>>>>>>>>> > time.
> > > >>>>>>>>>>>>>>> > Multiples, in fact.
> > > >>>>>>>>>>>>>>> >
> > > >>>>>>>>>>>>>>> > On Fri, Sep 13, 2013 at 6:19 PM, Mike Tutkowski
> > > >>>>>>>>>>>>>>> > <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>>>>>>> >> Looks like you can have multiple storage pools:
> > > >>>>>>>>>>>>>>> >>
> > > >>>>>>>>>>>>>>> >> mtutkowski@ubuntu:~$ virsh pool-list
> > > >>>>>>>>>>>>>>> >> Name                 State      Autostart
> > > >>>>>>>>>>>>>>> >> -----------------------------------------
> > > >>>>>>>>>>>>>>> >> default              active     yes
> > > >>>>>>>>>>>>>>> >> iSCSI                active     no
> > > >>>>>>>>>>>>>>> >>
> > > >>>>>>>>>>>>>>> >>
> > > >>>>>>>>>>>>>>> >> On Fri, Sep 13, 2013 at 6:12 PM, Mike Tutkowski
> > > >>>>>>>>>>>>>>> >> <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> Reading through the docs you pointed out.
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> I see what you're saying now.
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> You can create an iSCSI (libvirt) storage pool
> based
> > on
> > > >>>>>>>>>>>>>>> >>> an iSCSI target.
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> In my case, the iSCSI target would only have one
> LUN,
> > > so
> > > >>>>>>>>>>>>>>> >>> there would only
> > > >>>>>>>>>>>>>>> >>> be one iSCSI (libvirt) storage volume in the
> > (libvirt)
> > > >>>>>>>>>>>>>>> >>> storage pool.
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> As you say, my plug-in creates and destroys iSCSI
> > > >>>>>>>>>>>>>>> >>> targets/LUNs on the
> > > >>>>>>>>>>>>>>> >>> SolidFire SAN, so it is not a problem that libvirt
> > does
> > > >>>>>>>>>>>>>>> >>> not support
> > > >>>>>>>>>>>>>>> >>> creating/deleting iSCSI targets/LUNs.
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> It looks like I need to test this a bit to see if
> > > libvirt
> > > >>>>>>>>>>>>>>> >>> supports
> > > >>>>>>>>>>>>>>> >>> multiple iSCSI storage pools (as you mentioned,
> since
> > > >>>>>>>>>>>>>>> >>> each one of its
> > > >>>>>>>>>>>>>>> >>> storage pools would map to one of my iSCSI
> > > targets/LUNs).
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> On Fri, Sep 13, 2013 at 5:58 PM, Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>> <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>> LibvirtStoragePoolDef has this type:
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>     public enum poolType {
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>         ISCSI("iscsi"), NETFS("netfs"),
> > > >>>>>>>>>>>>>>> >>>> LOGICAL("logical"), DIR("dir"),
> > > >>>>>>>>>>>>>>> >>>> RBD("rbd");
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>         String _poolType;
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>         poolType(String poolType) {
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>             _poolType = poolType;
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>         }
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>         @Override
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>         public String toString() {
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>             return _poolType;
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>         }
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>     }
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>> It doesn't look like the iSCSI type is currently
> > being
> > > >>>>>>>>>>>>>>> >>>> used, but I'm
> > > >>>>>>>>>>>>>>> >>>> understanding more what you were getting at.
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>> Can you tell me for today (say, 4.2), when someone
> > > >>>>>>>>>>>>>>> >>>> selects the
> > > >>>>>>>>>>>>>>> >>>> SharedMountPoint option and uses it with iSCSI, is
> > > that
> > > >>>>>>>>>>>>>>> >>>> the "netfs" option
> > > >>>>>>>>>>>>>>> >>>> above or is that just for NFS?
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>> Thanks!
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>> On Fri, Sep 13, 2013 at 5:50 PM, Marcus Sorensen
> > > >>>>>>>>>>>>>>> >>>> <shadowsor@gmail.com>
> > > >>>>>>>>>>>>>>> >>>> wrote:
> > > >>>>>>>>>>>>>>> >>>>>
> > > >>>>>>>>>>>>>>> >>>>> Take a look at this:
> > > >>>>>>>>>>>>>>> >>>>>
> > > >>>>>>>>>>>>>>> >>>>>
> > http://libvirt.org/storage.html#StorageBackendISCSI
> > > >>>>>>>>>>>>>>> >>>>>
> > > >>>>>>>>>>>>>>> >>>>> "Volumes must be pre-allocated on the iSCSI
> server,
> > > and
> > > >>>>>>>>>>>>>>> >>>>> cannot be
> > > >>>>>>>>>>>>>>> >>>>> created via the libvirt APIs.", which I believe
> > your
> > > >>>>>>>>>>>>>>> >>>>> plugin will take
> > > >>>>>>>>>>>>>>> >>>>> care of. Libvirt just does the work of logging in
> > and
> > > >>>>>>>>>>>>>>> >>>>> hooking it up to
> > > >>>>>>>>>>>>>>> >>>>> the VM (I believe the Xen api does that work in
> the
> > > Xen
> > > >>>>>>>>>>>>>>> >>>>> stuff).
> > > >>>>>>>>>>>>>>> >>>>>
> > > >>>>>>>>>>>>>>> >>>>> What I'm not sure about is whether this provides
> a
> > > 1:1
> > > >>>>>>>>>>>>>>> >>>>> mapping, or if
> > > >>>>>>>>>>>>>>> >>>>> it just allows you to register 1 iscsi device as
> a
> > > >>>>>>>>>>>>>>> >>>>> pool. You may need
> > > >>>>>>>>>>>>>>> >>>>> to write some test code or read up a bit more
> about
> > > >>>>>>>>>>>>>>> >>>>> this. Let us know.
> > > >>>>>>>>>>>>>>> >>>>> If it doesn't, you may just have to write your
> own
> > > >>>>>>>>>>>>>>> >>>>> storage adaptor
> > > >>>>>>>>>>>>>>> >>>>> rather than changing LibvirtStorageAdaptor.java.
> >  We
> > > >>>>>>>>>>>>>>> >>>>> can cross that
> > > >>>>>>>>>>>>>>> >>>>> bridge when we get there.
> > > >>>>>>>>>>>>>>> >>>>>
> > > >>>>>>>>>>>>>>> >>>>> As far as interfacing with libvirt, see the java
> > > >>>>>>>>>>>>>>> >>>>> bindings doc.
> > > >>>>>>>>>>>>>>> >>>>> http://libvirt.org/sources/java/javadoc/Normally,
> > > >>>>>>>>>>>>>>> >>>>> you'll see a
> > > >>>>>>>>>>>>>>> >>>>> connection object be made, then calls made to
> that
> > > >>>>>>>>>>>>>>> >>>>> 'conn' object. You
> > > >>>>>>>>>>>>>>> >>>>> can look at the LibvirtStorageAdaptor to see how
> > that
> > > >>>>>>>>>>>>>>> >>>>> is done for
> > > >>>>>>>>>>>>>>> >>>>> other pool types, and maybe write some test java
> > code
> > > >>>>>>>>>>>>>>> >>>>> to see if you
> > > >>>>>>>>>>>>>>> >>>>> can interface with libvirt and register iscsi
> > storage
> > > >>>>>>>>>>>>>>> >>>>> pools before you
> > > >>>>>>>>>>>>>>> >>>>> get started.
> > > >>>>>>>>>>>>>>> >>>>>
> > > >>>>>>>>>>>>>>> >>>>> On Fri, Sep 13, 2013 at 5:31 PM, Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>>>> <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>>>>>>> >>>>> > So, Marcus, I need to investigate libvirt more,
> > but
> > > >>>>>>>>>>>>>>> >>>>> > you figure it
> > > >>>>>>>>>>>>>>> >>>>> > supports
> > > >>>>>>>>>>>>>>> >>>>> > connecting to/disconnecting from iSCSI targets,
> > > >>>>>>>>>>>>>>> >>>>> > right?
> > > >>>>>>>>>>>>>>> >>>>> >
> > > >>>>>>>>>>>>>>> >>>>> >
> > > >>>>>>>>>>>>>>> >>>>> > On Fri, Sep 13, 2013 at 5:29 PM, Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>>>> > <mike.tutkowski@solidfire.com> wrote:
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >> OK, thanks, Marcus
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >> I am currently looking through some of the
> > classes
> > > >>>>>>>>>>>>>>> >>>>> >> you pointed out
> > > >>>>>>>>>>>>>>> >>>>> >> last
> > > >>>>>>>>>>>>>>> >>>>> >> week or so.
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >> On Fri, Sep 13, 2013 at 5:26 PM, Marcus
> Sorensen
> > > >>>>>>>>>>>>>>> >>>>> >> <shadowsor@gmail.com>
> > > >>>>>>>>>>>>>>> >>>>> >> wrote:
> > > >>>>>>>>>>>>>>> >>>>> >>>
> > > >>>>>>>>>>>>>>> >>>>> >>> Yes, my guess is that you will need the iscsi
> > > >>>>>>>>>>>>>>> >>>>> >>> initiator utilities
> > > >>>>>>>>>>>>>>> >>>>> >>> installed. There should be standard packages
> > for
> > > >>>>>>>>>>>>>>> >>>>> >>> any distro. Then
> > > >>>>>>>>>>>>>>> >>>>> >>> you'd call
> > > >>>>>>>>>>>>>>> >>>>> >>> an agent storage adaptor to do the initiator
> > > login.
> > > >>>>>>>>>>>>>>> >>>>> >>> See the info I
> > > >>>>>>>>>>>>>>> >>>>> >>> sent
> > > >>>>>>>>>>>>>>> >>>>> >>> previously about LibvirtStorageAdaptor.java
> and
> > > >>>>>>>>>>>>>>> >>>>> >>> libvirt iscsi
> > > >>>>>>>>>>>>>>> >>>>> >>> storage type
> > > >>>>>>>>>>>>>>> >>>>> >>> to see if that fits your need.
> > > >>>>>>>>>>>>>>> >>>>> >>>
> > > >>>>>>>>>>>>>>> >>>>> >>> On Sep 13, 2013 4:55 PM, "Mike Tutkowski"
> > > >>>>>>>>>>>>>>> >>>>> >>> <mike.tutkowski@solidfire.com>
> > > >>>>>>>>>>>>>>> >>>>> >>> wrote:
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> Hi,
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> As you may remember, during the 4.2 release
> I
> > > >>>>>>>>>>>>>>> >>>>> >>>> developed a SolidFire
> > > >>>>>>>>>>>>>>> >>>>> >>>> (storage) plug-in for CloudStack.
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> This plug-in was invoked by the storage
> > > framework
> > > >>>>>>>>>>>>>>> >>>>> >>>> at the necessary
> > > >>>>>>>>>>>>>>> >>>>> >>>> times
> > > >>>>>>>>>>>>>>> >>>>> >>>> so that I could dynamically create and
> delete
> > > >>>>>>>>>>>>>>> >>>>> >>>> volumes on the
> > > >>>>>>>>>>>>>>> >>>>> >>>> SolidFire SAN
> > > >>>>>>>>>>>>>>> >>>>> >>>> (among other activities).
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> This is necessary so I can establish a 1:1
> > > mapping
> > > >>>>>>>>>>>>>>> >>>>> >>>> between a
> > > >>>>>>>>>>>>>>> >>>>> >>>> CloudStack
> > > >>>>>>>>>>>>>>> >>>>> >>>> volume and a SolidFire volume for QoS.
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> In the past, CloudStack always expected the
> > > admin
> > > >>>>>>>>>>>>>>> >>>>> >>>> to create large
> > > >>>>>>>>>>>>>>> >>>>> >>>> volumes ahead of time and those volumes
> would
> > > >>>>>>>>>>>>>>> >>>>> >>>> likely house many
> > > >>>>>>>>>>>>>>> >>>>> >>>> root and
> > > >>>>>>>>>>>>>>> >>>>> >>>> data disks (which is not QoS friendly).
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> To make this 1:1 mapping scheme work, I
> needed
> > > to
> > > >>>>>>>>>>>>>>> >>>>> >>>> modify logic in
> > > >>>>>>>>>>>>>>> >>>>> >>>> the
> > > >>>>>>>>>>>>>>> >>>>> >>>> XenServer and VMware plug-ins so they could
> > > >>>>>>>>>>>>>>> >>>>> >>>> create/delete storage
> > > >>>>>>>>>>>>>>> >>>>> >>>> repositories/datastores as needed.
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> For 4.3 I want to make this happen with KVM.
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> I'm coming up to speed with how this might
> > work
> > > on
> > > >>>>>>>>>>>>>>> >>>>> >>>> KVM, but I'm
> > > >>>>>>>>>>>>>>> >>>>> >>>> still
> > > >>>>>>>>>>>>>>> >>>>> >>>> pretty new to KVM.
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> Does anyone familiar with KVM know how I
> will
> > > need
> > > >>>>>>>>>>>>>>> >>>>> >>>> to interact with
> > > >>>>>>>>>>>>>>> >>>>> >>>> the
> > > >>>>>>>>>>>>>>> >>>>> >>>> iSCSI target? For example, will I have to
> > expect
> > > >>>>>>>>>>>>>>> >>>>> >>>> Open iSCSI will be
> > > >>>>>>>>>>>>>>> >>>>> >>>> installed on the KVM host and use it for
> this
> > to
> > > >>>>>>>>>>>>>>> >>>>> >>>> work?
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> Thanks for any suggestions,
> > > >>>>>>>>>>>>>>> >>>>> >>>> Mike
> > > >>>>>>>>>>>>>>> >>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>> >>>> --
> > > >>>>>>>>>>>>>>> >>>>> >>>> Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>>>> >>>> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>>>> >>>>> >>>> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>>>> >>>>> >>>> o: 303.746.7302
> > > >>>>>>>>>>>>>>> >>>>> >>>> Advancing the way the world uses the cloud™
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >>
> > > >>>>>>>>>>>>>>> >>>>> >> --
> > > >>>>>>>>>>>>>>> >>>>> >> Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>>>> >> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>>>> >>>>> >> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>>>> >>>>> >> o: 303.746.7302
> > > >>>>>>>>>>>>>>> >>>>> >> Advancing the way the world uses the cloud™
> > > >>>>>>>>>>>>>>> >>>>> >
> > > >>>>>>>>>>>>>>> >>>>> >
> > > >>>>>>>>>>>>>>> >>>>> >
> > > >>>>>>>>>>>>>>> >>>>> >
> > > >>>>>>>>>>>>>>> >>>>> > --
> > > >>>>>>>>>>>>>>> >>>>> > Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>>>> > Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>>>> >>>>> > e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>>>> >>>>> > o: 303.746.7302
> > > >>>>>>>>>>>>>>> >>>>> > Advancing the way the world uses the cloud™
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>>
> > > >>>>>>>>>>>>>>> >>>> --
> > > >>>>>>>>>>>>>>> >>>> Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>>> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>>>> >>>> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>>>> >>>> o: 303.746.7302
> > > >>>>>>>>>>>>>>> >>>> Advancing the way the world uses the cloud™
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>>
> > > >>>>>>>>>>>>>>> >>> --
> > > >>>>>>>>>>>>>>> >>> Mike Tutkowski
> > > >>>>>>>>>>>>>>> >>> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>>>> >>> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>>>> >>> o: 303.746.7302
> > > >>>>>>>>>>>>>>> >>> Advancing the way the world uses the cloud™
> > > >>>>>>>>>>>>>>> >>
> > > >>>>>>>>>>>>>>> >>
> > > >>>>>>>>>>>>>>> >>
> > > >>>>>>>>>>>>>>> >>
> > > >>>>>>>>>>>>>>> >> --
> > > >>>>>>>>>>>>>>> >> Mike Tutkowski
> > > >>>>>>>>>>>>>>> >> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>>>> >> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>>>> >> o: 303.746.7302
> > > >>>>>>>>>>>>>>> >> Advancing the way the world uses the cloud™
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>>
> > > >>>>>>>>>>>>>> --
> > > >>>>>>>>>>>>>> Mike Tutkowski
> > > >>>>>>>>>>>>>> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>>> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>>> o: 303.746.7302
> > > >>>>>>>>>>>>>> Advancing the way the world uses the cloud™
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>>
> > > >>>>>>>>>>>>> --
> > > >>>>>>>>>>>>> Mike Tutkowski
> > > >>>>>>>>>>>>> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>>>>>> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>>>>>> o: 303.746.7302
> > > >>>>>>>>>>>>> Advancing the way the world uses the cloud™
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>>>> --
> > > >>>>>>>>> Mike Tutkowski
> > > >>>>>>>>> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>>>>> e: mike.tutkowski@solidfire.com
> > > >>>>>>>>> o: 303.746.7302
> > > >>>>>>>>> Advancing the way the world uses the cloud™
> > > >>>>>>
> > > >>>>>>
> > > >>>>>>
> > > >>>>>>
> > > >>>>>> --
> > > >>>>>> Mike Tutkowski
> > > >>>>>> Senior CloudStack Developer, SolidFire Inc.
> > > >>>>>> e: mike.tutkowski@solidfire.com
> > > >>>>>> o: 303.746.7302
> > > >>>>>> Advancing the way the world uses the cloud™
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> --
> > > >>> Mike Tutkowski
> > > >>> Senior CloudStack Developer, SolidFire Inc.
> > > >>> e: mike.tutkowski@solidfire.com
> > > >>> o: 303.746.7302
> > > >>> Advancing the way the world uses the cloud™
> > > >
> > > >
> > > >
> > > >
> > > > --
> > > > Mike Tutkowski
> > > > Senior CloudStack Developer, SolidFire Inc.
> > > > e: mike.tutkowski@solidfire.com
> > > > o: 303.746.7302
> > > > Advancing the way the world uses the cloud™
> > >
> >
> >
> >
> > --
> > *Mike Tutkowski*
> > *Senior CloudStack Developer, SolidFire Inc.*
> > e: mike.tutkowski@solidfire.com
> > o: 303.746.7302
> > Advancing the way the world uses the
> > cloud<http://solidfire.com/solution/overview/?video=play>
> > *™*
> >
>



-- 
*Mike Tutkowski*
*Senior CloudStack Developer, SolidFire Inc.*
e: mike.tutkowski@solidfire.com
o: 303.746.7302
Advancing the way the world uses the
cloud<http://solidfire.com/solution/overview/?video=play>
*™*

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