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xen-users
Re: [Xen-users] Cheap and cheerful replication
Le 06/06/2011 17:00, msgbox450@xxxxxxxxx a écrit :
Hi guys,
I wonder if anyone has found any simple solution for cheap
and cheerful replication between two hosts (in this case for
XCP)?
Basically I have two machines (A and B). I want to run 8 VMs
on local storage on server A and 8 VMs on local storage on
server B. I want all the machines on server A to be backed up to
server B and vice versa. In the event of failure, I want to be
able to run all 16 VMs on one host.
My current thought is to just set up NFS on both hosts and
then set up nightly snapshots on each to copy to the other.
However, it would be nice to have some proper block level
replication going on instead so that live migration could be
used.
This is what DRBD is meant for: networked block level replication
But maybe it's not so easy and some users here reported (unverified)
issues. I f you don't feel confortable with cluster architectures
forget about drbd it wouls lead you to data loss pretty surely.
Also be aware that block level replication *won't* guarantee any
filesystem consistancy. In most cases it's not a problem but if you
have high rate IO (eg a busy postgresql or oracle sgbd) you may not
be able to mount the replicated filesystems.
Knowing that you may also consider exporting you block device using
nbd or gndb or aoe..., and mirror it to a local volumes using
mdadm... that should work too.
What ever solutions you choose I don't think any of them would be
"simple". Remote data replication *is* a complicated situation, and
of course it won't replace backup systems.
regards.
Has anyone got any good ideas for this (and before anyone
says it, I don't want to involve any separate machines or
network storage devices because that pushes the budget out of
window, I want to find a way to make it work with a mirrored
pair of hosts).
Thanks :D
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