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From Rajesh Battala <rajesh.batt...@citrix.com>
Subject RE: Change qcow disk cache=none
Date Wed, 20 Feb 2013 04:33:19 GMT
Hi Jason,
If cache=none on the disk then migration of the VM won't work right?.
I was going through RHEL link https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html-single/Virtualization_Host_Configuration_and_Guest_Installation_Guide/index.html

Migration restrictions
============================
Because device assignment uses hardware on the specific host where the guest was started,
migration and save/restore are not supported when device assignment is in use. If the guest
operating system supports hot-plugging, assigned devices can be removed prior to the migration
or save/restore operation to enable this feature.
Live migration is only possible between hosts with the same CPU type (that is, Intel to Intel
or AMD to AMD only).
For live migration, both hosts must have the same value set for the No eXecution (NX) bit,
either on or off.
For migration to work, cache=none must be specified for all block devices opened in write
mode.
Warning
Failing to include the cache=none option can result in disk corruption.

Enabling this feature will have issues with HA right?

Thanks
Rajesh Battala


> -----Original Message-----
> From: Rajesh Battala [mailto:rajesh.battala@citrix.com]
> Sent: Tuesday, February 19, 2013 7:43 PM
> To: cloudstack-dev@incubator.apache.org
> Subject: RE: Change qcow disk cache=none
>
> Great to hear it worked.
>
> From: Jason Villalta [mailto:jason@rubixnet.com]
> Sent: Tuesday, February 19, 2013 7:38 PM
> To: cloudstack-dev@incubator.apache.org
> Subject: Re: Change qcow disk cache=none
>
> Thanks for all of your help on this guys.  This worked like a charm!
> On Mon, Feb 18, 2013 at 5:30 AM, Wido den Hollander
> <wido@widodh.nl<mailto:wido@widodh.nl>> wrote:
> On 02/18/2013 05:49 AM, Rajesh Battala wrote:
> Sounds great.
> How are you planning to implement the cache config value.  From GC settings or
> as part of offering or a dynamic changeable param to the VM.
>
> This has been covered by this Jira issue:
> https://issues.apache.org/jira/browse/CLOUDSTACK-1302
>
> Wido
>
> Thanks
> Rajesh Battala
>
> From: Jason Villalta [mailto:jason@rubixnet.com<mailto:jason@rubixnet.com>]
> Sent: Monday, February 18, 2013 9:51 AM
> To: cloudstack-dev@incubator.apache.org<mailto:cloudstack-
> dev@incubator.apache.org>
> Subject: Re: Change qcow disk cache=none
>
> Yes I have gotten farther.  I have the hard coded parameter changed and the
> system Proxy VM is running now but I am running into issues with the secondary
> storage vm.  Troubleshooting that now.
>
> As for the cache setting, I think that still need to be setup as a configurable
> option without a rebuild.  Once I get the cloud fully functional I will have some
> time to contribute to this issue.  For now I just need to get this up and running.
>
> Thanks,
>
> On Sun, Feb 17, 2013 at 11:11 PM, Rajesh Battala
> <rajesh.battala@citrix.com<mailto:rajesh.battala@citrix.com><mailto:rajesh.ba
> ttala@citrix.com<mailto:rajesh.battala@citrix.com>>> wrote:
> Now you were able to build and run the cloud right.!
>
> Thanks
> Rajesh Battala
>
> From: Jason Villalta
> [mailto:jason@rubixnet.com<mailto:jason@rubixnet.com><mailto:jason@rubix
> net.com<mailto:jason@rubixnet.com>>]
> Sent: Monday, February 18, 2013 3:59 AM
> To: cloudstack-dev@incubator.apache.org<mailto:cloudstack-
> dev@incubator.apache.org><mailto:cloudstack-
> dev@incubator.apache.org<mailto:cloudstack-dev@incubator.apache.org>>
> Subject: Re: Change qcow disk cache=none Got it, wrong maven version..
> On Sun, Feb 17, 2013 at 4:54 PM, Jason Villalta
> <jason@rubixnet.com<mailto:jason@rubixnet.com><mailto:jason@rubixnet.co
> m<mailto:jason@rubixnet.com>><mailto:jason@rubixnet.com<mailto:jason@r
> ubixnet.com><mailto:jason@rubixnet.com<mailto:jason@rubixnet.com>>>>
> wrote:
> I tried this method to build 4.0.0 and I get 3 failed dependencies.  Does
> something in git need to be updated with different paths?
>
> error: error reading /home/sysadmin/.m2/repository/org/apache/axis2/axis2-
> kernel/1.5.1/axis2-kernel-1.5.1.jar; error in opening zip file
> error: error reading
> /home/sysadmin/.m2/repository/org/apache/axis2/mex/1.5.1/mex-1.5.1-
> impl.jar; error in opening zip file
> error: error reading /home/sysadmin/.m2/repository/org/apache/axis2/axis2-
> mtompolicy/1.5.1/axis2-mtompolicy-1.5.1.jar; error in opening zip file
>
> On Fri, Feb 15, 2013 at 10:16 AM, Marcus Sorensen
> <shadowsor@gmail.com<mailto:shadowsor@gmail.com><mailto:shadowsor@
> gmail.com<mailto:shadowsor@gmail.com>><mailto:shadowsor@gmail.com<m
> ailto:shadowsor@gmail.com><mailto:shadowsor@gmail.com<mailto:shadows
> or@gmail.com>>>> wrote:
> If you just want to change 'none' to 'writeback' or something like that:
>
> git clone https://git-wip-us.apache.org/repos/asf/incubator-cloudstack.git
> cd incubator-cloudstack
> git checkout 4.0
> vi
> ./plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtVMD
> ef.java
> # look for the one occurrence of 'none' in this file and change it as you see fit
>
> Then build your packages
> (https://cwiki.apache.org/CLOUDSTACK/building-with-
> maven.html#BuildingwithMaven-BuildingRPMpackages)
> mvn install -P deps && ./waf rpm
> or
> mvn package -P deb
>
> If you want the fully configurable experience from GUI, with per disk-offering
> settings, then you'd open the request, and it may make it into 4.2 in May. Or you
> could pull the git repo and see if the feature applies to 4.1 and build your own
> packages in a month or so when the feature branch is ready.
> On Fri, Feb 15, 2013 at 7:05 AM, Jason Villalta
> <jason@rubixnet.com<mailto:jason@rubixnet.com><mailto:jason@rubixnet.co
> m<mailto:jason@rubixnet.com>><mailto:jason@rubixnet.com<mailto:jason@r
> ubixnet.com><mailto:jason@rubixnet.com<mailto:jason@rubixnet.com>>>>
> wrote:
> So is there anyway to make this work today or will I have to wait until this is
> properly implemented?  This may mean I need to take another look at openstack
> or opennebula and switch back.
>
> On Fri, Feb 15, 2013 at 9:00 AM, Wido den Hollander
> <wido@widodh.nl<mailto:wido@widodh.nl><mailto:wido@widodh.nl<mailto:w
> ido@widodh.nl>><mailto:wido@widodh.nl<mailto:wido@widodh.nl><mailto:wi
> do@widodh.nl<mailto:wido@widodh.nl>>>> wrote:
> On 02/15/2013 02:31 PM, Jason Villalta wrote:
>
> Is there any way easy way to make this setting dependent on the storage
> definition?  For example some primary storage may need this set to one value
> such as cache=writeback such as with the case of ZFS, GlusterFS, CEPH.  Then
> other storage may want a different setting such as cache=writethough or none
> which is the case with a local ext4 storage or NFS.
>
> Exactly.
>
> I brought this up about a week ago, see this thread:
> http://markmail.org/thread/qmrod55gfmhwzot4
>
> It shouldn't be a global property, it should be defined per storage pool, or even
> better, per disk offering.
>
> Right now we are talking about the cache setting, but tomorrow it could be a
> different setting.
>
> Wido
>
>
>
> On Thu, Feb 14, 2013 at 11:08 PM, Rajesh Battala
> <rajesh.battala@citrix.com<mailto:rajesh.battala@citrix.com><mailto:rajesh.ba
> ttala@citrix.com<mailto:rajesh.battala@citrix.com>><mailto:rajesh.battala@cit
> rix.com<mailto:rajesh.battala@citrix.com><mailto:rajesh.battala@citrix.com<
> mailto:rajesh.battala@citrix.com>>>> wrote:
>
> Hi Jason Villalta,
> In LibvirtVmDef.java, there is DiskDef class ,  get the cache value from the Global
> config, while constructing the xml in the override method the class toString()
> specify the cache value, currently it is using "none".
>
> NOTE: whenever there is change in GC value, MS should restart for the value to
> take effect.
>
> Thanks
> Rajesh Battala
> -----Original Message-----
> From: Rajesh Battala
> [mailto:rajesh.battala@citrix.com<mailto:rajesh.battala@citrix.com><mailto:raj
> esh.battala@citrix.com<mailto:rajesh.battala@citrix.com>><mailto:rajesh.batt
> ala@citrix.com<mailto:rajesh.battala@citrix.com><mailto:rajesh.battala@citrix
> .com<mailto:rajesh.battala@citrix.com>>>]
> Sent: Friday, February 15, 2013 9:22 AM
> To: cloudstack-users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>>>; cloudstack-
> dev@incubator.apache.org<mailto:dev@incubator.apache.org><mailto:dev@in
> cubator.apache.org<mailto:dev@incubator.apache.org>><mailto:dev@incubat
> or.apache.org<mailto:dev@incubator.apache.org><mailto:dev@incubator.apac
> he.org<mailto:dev@incubator.apache.org>>>
> Subject: RE: Change qcow disk cache=none
>
> Hi Jason Villalta,
>
> Can you raise the ticket for the same. I can work on it if you assign to me.
>
> Thanks
> Rajesh Battala
> -----Original Message-----
> From: Edison Su
> [mailto:Edison.su@citrix.com<mailto:Edison.su@citrix.com><mailto:Edison.su
> @citrix.com<mailto:Edison.su@citrix.com>><mailto:Edison.su@citrix.com<mail
> to:Edison.su@citrix.com><mailto:Edison.su@citrix.com<mailto:Edison.su@citri
> x.com>>>]
> Sent: Friday, February 15, 2013 4:59 AM
> To: cloudstack-users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>>>
> Subject: RE: Change qcow disk cache=none
>
> The code is at https://git-wip-us.apache.org/repos/asf?p=incubator-
> cloudstack.git;a=blob;f=plugins/hypervisors/kvm/src/com/cloud/hypervis
> or/kv
> m/resource/LibvirtVMDef.java;h=acfd9cf1fe8eba217f09e20adf3101d1295d51d
>
> a;hb=HEAD, search "cache".
> you can add a global configuration in cloudstack, or add a configuration in
> agent.properties, to specify cache attribute.
> -----Original Message-----
> From: Jason Villalta
> [mailto:jason@rubixnet.com<mailto:jason@rubixnet.com><mailto:jason@rubix
> net.com<mailto:jason@rubixnet.com>><mailto:jason@rubixnet.com<mailto:jas
> on@rubixnet.com><mailto:jason@rubixnet.com<mailto:jason@rubixnet.com>>
> >]
> Sent: Thursday, February 14, 2013 2:16 PM
> To: cloudstack-users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>>>
> Subject: Re: Change qcow disk cache=none
>
> Ok, I see the folks at openstack ran into a similar issue.
> https://bugs.launchpad.net/nova/+bug/959637
>
> How can I contribute to this?  Can you recommend a part of the code to look at
> so I can build and test a patch?
>
> On Thu, Feb 14, 2013 at 5:13 PM, Edison Su
> <Edison.su@citrix.com<mailto:Edison.su@citrix.com><mailto:Edison.su@citrix.
> com<mailto:Edison.su@citrix.com>><mailto:Edison.su@citrix.com<mailto:Ediso
> n.su@citrix.com><mailto:Edison.su@citrix.com<mailto:Edison.su@citrix.com>>
> >>
> wrote:
>
> need to change cloudstack java code, right now, it's hard coded to
>
> "cache=none".
>
> -----Original Message-----
> From: Jason Villalta
> [mailto:jason@rubixnet.com<mailto:jason@rubixnet.com><mailto:jason@rubix
> net.com<mailto:jason@rubixnet.com>><mailto:jason@rubixnet.com<mailto:jas
> on@rubixnet.com><mailto:jason@rubixnet.com<mailto:jason@rubixnet.com>>
> >]
> Sent: Thursday, February 14, 2013 1:45 PM
> To: cloudstack-users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org><mailto:cloudstack-
> users@incubator.apache.org<mailto:cloudstack-
> users@incubator.apache.org>>>
> Subject: Change qcow disk cache=none
>
> Is there a way to change this kvm disk cache setting in Cloudstack or
>
> template?
>
> If so where is the setting applied?
>
> --
> --
> Jason Villalta
> Co-founder
> 800.799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>><tel:800
> .799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>>>
|
> www.RubixTechnology.com<http://www.RubixTechnology.com><http://www.
> RubixTechnology.com><http://www.RubixTechnology.com>
>
>
>
>
> --
> --
> Jason Villalta
> Co-founder
> 800.799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>><tel:800
> .799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>>>
|
> www.RubixTechnology.com<http://www.RubixTechnology.com><http://www.
> RubixTechnology.com><http://www.RubixTechnology.com>
>
>
>
>
>
>
>
> --
> --
> Jason Villalta
> Co-founder
> 800.799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>><tel:800
> .799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>>>
|
> www.RubixTechnology.com<http://www.RubixTechnology.com><http://www.
> RubixTechnology.com><http://www.RubixTechnology.com>
>
>
>
> --
> --
> Jason Villalta
> Co-founder
> [cid:ii_13a3276a82c64fe9]
> 800.799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>>
|
> www.RubixTechnology.com<http://www.RubixTechnology.com><http://www.
> RubixTechnology.com><http://www.rubixtechnology.com/>
>
>
>
> --
> --
> Jason Villalta
> Co-founder
> [cid:ii_13a3276a82c64fe9]
> 800.799.4407<tel:800.799.4407><tel:800.799.4407<tel:800.799.4407>>
|
> www.RubixTechnology.com<http://www.RubixTechnology.com><http://www.
> RubixTechnology.com><http://www.rubixtechnology.com/>
>
>
>
> --
> --
> Jason Villalta
> Co-founder
> [cid:ii_13a3276a82c64fe9]
> 800.799.4407<tel:800.799.4407> |
> www.RubixTechnology.com<http://www.RubixTechnology.com><http://www.r
> ubixtechnology.com/>
>
>
>
>
> --
> --
> Jason Villalta
> Co-founder
> [cid:ii_13a3276a82c64fe9]
> 800.799.4407 |
> www.RubixTechnology.com<http://www.rubixtechnology.com/>

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