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xen-users
Re: [Xen-users] Re: Which distro to use for Dom0
in sles you have the following:
~ # xm --help | grep snap
snapshot-create Snapshot a running domain.
snapshot-list List available snapshots for a domain.
snapshot-apply Apply previous snapshot to domain.
snapshot-delete Delete snapshot of domain.
and to use such feature with your domU you have to start the vm in this way:
xm new dom1
xm start dom1
and then you can make
xm snapshot-create dom1 dom1-snap
I've not tried other image formats like vhd only qcow2
just a litte note qcow2 on OCFS2 is not very fast
Best regards,
Christian
Il 22/01/2011 20:18, Bart Coninckx ha scritto:
>
>
> Christian Zoffoli wrote:
>>
>> debian and xen are actually in different planets ...live migration is a
>> pain and there are many problems in general.
>>
>> If you whant something stable, updated and so on, suse sles 11 sp1 is
>> the way.
>>
>> Here are the main reasons:
>> - it's based on xen 4.0 + many interesting additions (for example
>> virtual machines snapshots --> **not only disk snapshots**)
>> - it's integrated with the new cluster stack (pacemaker and friends)
>> - it's integrated with OCFS2 (with many interesting patches in the tree)
>> - it's integrated with CLVM (on pacemaker & friends)
>> - it has pv over hvm drivers for linux and windows (in linux pv over hvm
>> for 64bit VMs is better performing)
>> - it has a fully working and certified infiniband stack
>> - it's more lightweight than redhat (it's possible to make very light
>> installations comparable in size/occupied resources to debian)
>> - suse xen kernel is also the starting point of the citrix xenserver
>> ...so it's not something different / unmaintained etc
>>
>> >From a performance perspective I suggest you to directly use CLVM for VM
>> images storage because I've seen poor performances in QCOW2 over OCFS2
>> setups.
>>
>> The only big problem I can see in the future of suse is the acquisition
>> by a microsoft controlled company of novell ...by the way also citrix is
>> very microsoft dependant ...so the soup is almost the same.
>>
>>
>> Best regards,
>> Christian
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-users
>>
>>
>
> Christian,
>
> I am particularly interested in the new snapshotting features you mention. I
> could not find anything in the SLES11SP1 Xen documentation about it though.
> Is this about the following out of the Xen 4.0 docs?:
>
> 114 Snapshots:
> 115
> 116 Pausing a guest will also plug the corresponding IO queue for
> blktap2
> 117 devices and stop blktap2 drivers. This can be used to implement a
> 118 safe live snapshot of qcow and vhd disks. An example script
> "xmsnap"
> 119 is shown in the tools/blktap2/drivers directory. This script will
> 120 perform a live snapshot of a qcow disk. VHD files can use the
> 121 "vhd-util snapshot" tool discussed above. If this snapshot command
> is
> 122 applied to a raw file mounted with tap:tapdisk:AIO, include the -m
> 123 flag and the driver will be reloaded as VHD. If applied to an
> already
> 124 mounted VHD file, omit the -m flag.
> 125
>
>
> thx,
>
> B.
>
--
Christian Zoffoli (XMerlin)
You never change things by fighting the existing reality. To change
something, build a new model that makes the existing model obsolete."
-- R. Buckminster Fuller
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