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Re: [Xen-users] Re: Which distro to use for Dom0

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Subject: Re: [Xen-users] Re: Which distro to use for Dom0
From: Christian Zoffoli <czoffoli@xxxxxxxxxxx>
Date: Mon, 24 Jan 2011 22:47:58 +0100
Cc: Bart Coninckx <bart.coninckx@xxxxxxxxxx>
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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,

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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