Re: [Xen-users] EVMS or GFS

[Karsten Nielsen <karsten-xen@xxxxxxxxxx>]

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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