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From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: CloudStack Storage Question
Date Mon, 14 Jan 2013 03:55:33 GMT
Another thing I was curious about (and perhaps someone on this list can
answer) is if, say, Xen is running one VM from one virtual volume (equal to
a LUN, in this scenario), can an app running in this VM access a data
volume from a different virtual volume?

So, the VM is running off of one virtual volume and the VM has access to
another virtual volume that one of its apps is using?

Does CloudStack support this model?

What this question comes down to is my company, SolidFire, offers a
sophisticated feature called hard quality of service.  One a
volume-by-volume basis (which we think of as being equal to a LUN), you
"dial in" the performance (IOPS) you need for the volume in question (not
"high, medium, and low," but the actual max and min IOPS).

I'm under the impression CloudStack is not exactly geared up at the moment
to support such a model.  Is that a true assessment?

Thanks!


On Sun, Jan 13, 2013 at 11:02 AM, Sebastien Goasguen <runseb@gmail.com>wrote:

>
> On Jan 13, 2013, at 6:56 PM, Wido den Hollander <wido@widodh.nl> wrote:
>
> >
> >
> > On 01/13/2013 06:47 PM, Sebastien Goasguen wrote:
> >>
> >> On Jan 11, 2013, at 9:22 PM, Marcus Sorensen <shadowsor@gmail.com>
> wrote:
> >>
> >>> On the KVM side, you can do NFS, Local disk storage, CLVM (shared block
> >>> device that has Clustered LVM on top of it, a primary pool is a
> particular
> >>> volume group and cloudstack carves out logical volumes out of it as
> >>> needed), and RBD (RADOS Block devices, Ceph shared storage. You point
> it at
> >>> your cluster and cloudstack creates RBD devices as needed). Also
> >>> SharedMountPoint for something like GFS,OCFS or some shared filesystem.
> >>>
> >>> Xen has NFS, a 'PreSetup' where you create an SR in your Xen cluster
> and
> >>> pass the SR to it (I think), and iSCSI (I'm not clear on how this
> works,
> >>> but I'm sure its in the docs)
> >>
> >> Hi Marcus, that's a nice summary.
> >>
> >> Can't we do any of the distributed file systems for primary storage
> with Xen ?
> >>
> >
> > I've been trying to convince the people from Xen to implement RBD into
> the blktap driver, but that hasn't been done.
> >
> > The people from Ceph also have had some conversations with Citrix, but
> so far nothing has come out of it.
> >
> > KVM seems to be the winner here if it comes down to distributed storage
> since it's open source and stuff can be implemented very quickly.
> >
> > If we want to get this into Xen, it's up to Citrix to implement it. They
> just might need a little extra push.
> >
> > If Citrix gets RBD into blktap, I'll make sure CloudStack knows how to
> work with it :)
>
> I will ping some of the xen open source developers I know.
>
> Any of you guys know of a good presentation on cloudstack storage support ?
>
> We have lots of things like caringo, swift, gluster etc…that don't seem to
> be very well documented. Is there an exhaustive list and some documentation
> somewhere ?
>
> thanks
>
>
> >
> > Wido
> >
> >> -Sebastien
> >>
> >>>
> >>> On Fri, Jan 11, 2013 at 1:14 PM, Mike Tutkowski <
> >>> mike.tutkowski@solidfire.com> wrote:
> >>>
> >>>> So, being new to CloudStack, I'm not sure what kind of storage
> protocols
> >>>> are currently supported in the product.  To my knowledge, NFS shares
> are
> >>>> what CloudStack has only supported in the past.  Does CloudStack
> support
> >>>> iSCSI targets at present?
> >>>>
> >>>> Thanks!
> >>>>
> >>>>
> >>>> On Thu, Jan 10, 2013 at 3:58 PM, Mike Tutkowski <
> >>>> mike.tutkowski@solidfire.com> wrote:
> >>>>
> >>>>> Thanks, Edison!
> >>>>>
> >>>>> That's very helpful info.
> >>>>>
> >>>>>
> >>>>> On Thu, Jan 10, 2013 at 3:49 PM, Edison Su <Edison.su@citrix.com>
> wrote:
> >>>>>
> >>>>>>
> >>>>>>
> >>>>>>> -----Original Message-----
> >>>>>>> From: Mike Tutkowski [mailto:mike.tutkowski@solidfire.com]
> >>>>>>> Sent: Thursday, January 10, 2013 2:22 PM
> >>>>>>> To: cloudstack-dev@incubator.apache.org
> >>>>>>> Subject: CloudStack Storage Question
> >>>>>>>
> >>>>>>> Hi everyone,
> >>>>>>>
> >>>>>>> I'm new to CloudStack and am trying to understand how it
works with
> >>>>>>> regards to storage exposed to hypervisors.
> >>>>>>>
> >>>>>>> For example:
> >>>>>>>
> >>>>>>> My company, SolidFire, has a feature that exists at the
> virtual-volume
> >>>>>> (for us,
> >>>>>>> equivalent to a LUN) layer:  Hard Quality of Service.  So,
for each
> >>>>>> volume in
> >>>>>>> one of our clusters, you can specify a minimum and maximum
number
> of
> >>>>>>> IOPS (beneficial to Cloud Service Providers who want to
write hard
> >>>> SLAs
> >>>>>>> around performance).
> >>>>>>>
> >>>>>>> We have a potential customer who is using CloudStack currently
with
> >>>>>> another
> >>>>>>> vendor (via NFS shares).  They asked me today how a hypervisor
run
> >>>> under
> >>>>>>> CloudStack would see the iSCSI storage exposed to them in
one of
> our
> >>>>>>> volumes.  More specifically, can the hypervisor see a volume
per
> VM or
> >>>>>> is the
> >>>>>>> hypervisor forced to create all of its VMs off of the same
volume?
>  If
> >>>>>> the
> >>>>>>> hypervisor is forced to create all of its VMs off of the
same
> volume,
> >>>>>> then this
> >>>>>>> would significantly reduce the value of our hard quality
of service
> >>>>>> offering
> >>>>>>> since all of these VMs would have to run at the same performance
> SLA.
> >>>>>>
> >>>>>>
> >>>>>> It depends on hypervisor, for KVM, per VM per LUN will work,
> xenserver
> >>>>>> doesn't work. For Vmware, it will work, but with a limitation(one
> ESXi
> >>>> host
> >>>>>> can only have 256 LUN at max).
> >>>>>>
> >>>>>>>
> >>>>>>> Can anyone help me better understand how this would work?
> >>>>>>>
> >>>>>>> Thanks so much!!
> >>>>>>>
> >>>>>>> --
> >>>>>>> *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>
> >>>>>>> *(tm)*
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> --
> >>>>> *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>
> >>>> *™*
> >>>>
> >>
>
>


-- 
*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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