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[Qemu-devel] Selective block migration (still on 0.13)
From: |
Christian Theune |
Subject: |
[Qemu-devel] Selective block migration (still on 0.13) |
Date: |
Thu, 13 Sep 2012 16:58:23 +0200 |
User-agent: |
Unison/2.1.9 |
Hi,
we're currently still on 0.13, looking forward to a large update soon. :)
We haven't been using live migration up until now, but are
investigating it to multiple downtimes (restarting updated hosts and
restarting updated guests) when doing system updates. So, we're trying
to find out whether we can get this into a usable shape while still
running 0.13.
I saw that 0.13 does have block migration available. However, looking
at the code, it's an "either or" situation: migrate all block devices
or none.
In our case we have the root disks on iSCSI (through virtio-blk) and
two additional local disks (for /tmp and swp).
Now, the iSCSI shouldn't be migrated but the local disks should.
Reading up in the current code, it doesn't look like this would be
feasable. Can someone prove me wrong? Please? :)
Even the earlier discussion regarding live block copy which included a
reference to using libvirt sounds like it would have a problem
instrumenting the live migration correctly: how do you get the
migration atomic if you need to copy the block devices independent of
the VM migration? Maybe, I'm missing something.
Cheers,
Christian
- [Qemu-devel] Selective block migration (still on 0.13),
Christian Theune <=