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xen-users
Re: [Xen-users] EVMS or GFS
Javier Guerra wrote:
On Thursday 25 May 2006 10:55 am, Karsten Nielsen wrote:
I have a lot of troble to get the GFS to work on xenified kernel 2.6.16.
Whereas I have no problem patching the xenified kernel with the evms
patches. I haven't tryed booting the kernel yet but it compiled fine.
the choice isn't between GFS and EVMS, because they are at different levels of
any solution. EVMS is a volume manager, like LVM; while GFS is a filesystem
(like ext3 or reiser, but cluster-aware)
Is it important to use a cluster-aware filesystem in my case. I can
imagine that the setup, at some point, may have heartbeat implementet
between so if one domU on fx. domO-1 gets inrespontant the domU gets
started on dom0-2. But at no point will more than one of the same domU
will be running.
How flexible is this setup ? Can I create a cluster from this setup ?
And does that apply GFS ?
in your case, i would use a volume manager (CLVM or EVMS) to manage the
storage and split into logical volumes, and give them to the Xen domUs. no
need to use any filesystem layer between the VBDs and the storage server.
Which volume manager is perferable to the other ? CLVM implies locking
mekanisme ? Can EVMS do the same ?
Can I change the setup to allow more storage servers for HA ?
using DRBD you can mirror the storage server transparently to the app servers.
if you add more storage servers (or DRBD pairs of servers), just add to the
volume group and all app servers would get more storage to either add more
logical volumes or extend existing ones.
If I want to use DRBD can I start out with only 1 storage server or do I
need 2 storage servers ?
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