On 10/30/11 19:35, Trey Dockendorf wrote:
Hello, I'm looking to use DRBD for the first time with my existing KVM
servers to facilitate live migrations, and had a few questions. I've
seen lots of documentation on using DRBD with LVM based virtual machine
disks, but I prefer to use qcow2 images. Is it possible to have DRBD
replicate the volume all the images are stored on rather than each
individual VM LVM block device? What would be used to ensure that only
one KVM node is accessing the disks at a time until migration is needed?
If anyone has any advice or suggestions please let me know. This is
my first time using anything for file system replication.
Also, due to limitations of my current network I will not have a private
or public network dedicated to the traffic of replication. Is it
possible to use a cross-over cable between my two nodes to facilitate
the DRBD function? Would I still be able to monitor and control DRBD
via the node's public port using a different server?
Thanks
- Trey
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Hi,
a cluster software like Pacemaker could serve your purpose very well. Do
incorporate STONITH though, as you will need dual primary DRBD.
Mind you Pacemaker is NOT easy, requires a lot of study and reading.
Share image files could be done with OCFS2 for example (or any
clustering file system). You then need to create a Pacemaker resource
handling this. Personally I never used OCFS2, but there are lots of
eaxmples around.
HTH,
B.
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