About block changes tracking with vhdx, from qemu bugtracker:
VHDX (MS Hyper-V) image format has initial read-only support. Dynamic and fixed
sized disks are supported, but not differencing images (e.g. VHDX images with a
backing file). Read-only is strictly enforced, and the 'readonly=on' option
must be used for any VHDX images.
"Differencing images". That is what I guess is used by hyper-v to only
replicate changed blocks of a virtual machine to another host
Cheers,
Sébastien
On 10.07.2013 20:39, srinivas jonn wrote:
FYI
vhdx support -- planned - no date yet, may need some influence within
the community
http://xenorg.uservoice.com/forums/172169-xen-development/suggestions/3314266-xcp-support-vhdx-format-for-vdi
------------------------------------------------------------------------
*From:* Sébastien RICCIO <s...@swisscenter.com>
*To:* Dan Pollak <danpoll...@gmail.com>; "xen-api@lists.xen.org"
<xen-api@lists.xen.org>
*Sent:* Wednesday, 10 July 2013 12:21 AM
*Subject:* Re: [Xen-API] XenServer/XCP replication (block changes
tracking)
Hi,
Thanks for your reply. We already thought about using DRBD but if you
want to mirror a specific VM to a host and another VM on another
host., you'd have to set a drbd device at tapdisk level for each VM
disk and not on the entire SR and this look quite heavy to implement.
I was thinking about a way to keep track of the changes at block level
somewhere between the VM and the vdi.
I don't know how this is done on hyper-v, probably their new vhdx
format keep track of the changes. Xenserver actually badly lacks this
feature :(.
Cheers,
Sébastien
On 09.07.2013 20:19, Dan Pollak wrote:
I am interested in this topic as well. I believe that most people are
going to point you towards DRBD.
Regards,
Dan
On Tue, Jul 9, 2013 at 11:50 AM, Sébastien RICCIO <s...@swisscenter.com
<mailto:s...@swisscenter.com>> wrote:
Hi,
I would like to know if any of you know a solution to
periodically mirror a running (or not) VM from one XenServer host
to another, using some kind of block changes tracking on the
vbd's (vdi's?).
I know there are softwares available like PHD Virtual, SEP or
quartersoft alike that do this but:
1) they're quite expensive
2) they need a dedicated appliance (vm) on each host to handle
the mirroring
3) and most important they don't use any block change tracking in
order to read only the changed blocks when doing regulary mirrors.
This third point is really a pain as the whole vm image must be
read each time in order to compare what has to be transfered.
Is there any existing solutions, or any plans to bring this
feature to the next versions of XenServer.
I must admit that I was getting mad when I heard that Hyper-V 3
(I want to avoid using it) has this feature and having tried it
myself I must admit it works amazingly well.
Now that share-nothing migrations are available on XenServer
(since 6.1 i think), the lack of this capability is the missing
brick to make even more awesome it is already :)
Any suggestions?
Cheers,
Sébastien
_______________________________________________
Xen-api mailing list
Xen-api@lists.xen.org <mailto:Xen-api@lists.xen.org>
http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api
_______________________________________________
Xen-api mailing list
Xen-api@lists.xen.org <mailto:Xen-api@lists.xen.org>
http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api
_______________________________________________
Xen-api mailing list
Xen-api@lists.xen.org
http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api
