[CentOS-virt] Can I use direct attached storage as a shared filesystem in Xen
rhdyes at gmail.com
Tue Feb 9 18:45:34 UTC 2010
I am doing rsync now. What is the difference between ocf2 and gfs?
On Tue, Feb 9, 2010 at 1:28 PM, Adam Adamou <adam0x54 at gmail.com> wrote:
> Keep it simple. ocfs2 - very easy to configure clustered filesystem
> and drbd for replication or rsync them nightly(depending how much data
> you can afford to lose). Something to keep in mind for drbd - You must
> have backups! - Your second server will be replicating what you have
> on your primary. For example, you accidentally remove some files and
> it gets synced to the backup you get screwed.
> my .02
> On Tue, Feb 9, 2010 at 12:46 PM, Christopher G. Stach II <cgs at ldsys.net>
> > ----- "Rich" <rhdyes at gmail.com> wrote:
> >> I think the better question is this. How can I make my 2 physical
> >> servers that are identical into the best clustered solution sharing
> >> the storage between the 2.
> > Do you want the storage to be redundant between the two like RAID 1 or
> just all of it accessible to any guest on either machine like a JBOD? For
> either, you can use a suitable mix of drbd, iSCSI, GNBD, LVM, heartbeat,
> keepalived, and a clustered filesystem. If you do the latter, remember that
> this squares your risk. If you want a simple A/B failover setup where the
> second physical host is idle until the first physical host fails, you can
> just use drbd and heartbeat or RHCS.
> >> They all use xfs.
> >> I want to keep the guests the same on each server.
> >> I will start with the backup server. I will go on each vm and delete
> >> this FS and block device.
> >> I then want make that whole 10 terabyte raid into one gfs and then
> >> re-attach it back to each guest.
> >> Is that possible or do I have to start all over again? If it can be
> >> done I then will sync the date from the mainserver to this backup
> >> server and then switch them and do the same to the mainserver.
> > That sounds about right. You need to make your backups (!), destroy the
> data on of your servers by creating the new clustered filesystem, copy the
> data from the other server, and then share it with your reconfigured guests.
> So, basically what you said.
> >> I have one more question which is another whole thread.
> >> I am using rsync to sync the 2 physical boxes now. Is there a better
> >> way to do this?
> > drbd, but rsync does a pretty good job in a lot of use cases. I wouldn't
> say that it fits this one, though.
> > --
> > Christopher G. Stach II
> > http://ldsys.net/~cgs/ <http://ldsys.net/%7Ecgs/>
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