Re: [Xen-users] Live Migration of a Virtual Machine without a Shared Storage

[Nick Katsipoulakis <popanik@xxxxxxxxx>]

Niels thank you for your immediate answer and concern.

Actually my FUSE Filesystem works as an abstraction layer between Xen and the underlying Filesystem (i.e. ext3). Everytime an I/O is performed by the VM, whose disk image is stored under my filesystem's mount point and is about to be migrated, the I/O is intercepted and actions are taken in order to ensure the consistency of the migrated disk image. It also manages to hand-over the VM and start its operation on the destination machine, before the whole disk image is migrated.

The DRBD setup is complex and I do not think I need it.

Cheers,

Nick

2013/5/29 Niels Dettenbach <nd@xxxxxxxxxxxx>

Am 29.05.2013 um 16:26 schrieb Nick Katsipoulakis:

I am aware of the fact that the live migration feature of Xen needs to have shared storage for the disk images. In my case, the disk image is moved to the destination machine, so that Xen can access it from its local Filesystem. How can I command Xen to live migrate the VM and look for the disk image in the local repository of the Destination Machine? Is there a tutorial (or guide) that indicates how this can be done?

not shure, but if your filesystem does the correct sync it might work like with i.e. DRBD setups:

http://backdrift.org/live-migration-and-synchronous-replicated-storage-with-xen-drbd-and-lvm

except your filesystem "copy" is not there att of migration. Depending from your filesystem implementation it could be necessary to hack within the migration code of xen - afaik there is no full scripting possibility or similiar to do such things like "do that before taking over a migration" or similiar. 

You filesystem implementation sounds interesting - do you have any details about it? If i understand right it is NOT intended for HA replication (where both hosts requires full copies of full current filesystem) but i.e. for load management in a cluster.

cheerioh,

Niels.

---

Niels Dettenbach

Syndicat IT & Internet

http://syndicat.com

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