On 12-12-26 10:24 PM, Miles Fidelman wrote:
Hi Folks,
I find myself trying to expand a 2-node high-availability cluster from
to a 4-node cluster. I'm running Xen virtualization, and currently
using DRBD to mirror data, and pacemaker to failover cleanly.
The thing is, I'm trying to add 2 nodes to the cluster, and DRBD
doesn't scale. Also, as a function of rackspace limits, and the
hardware at hand, I can't separate storage nodes from compute nodes -
instead, I have to live with 4 nodes, each with 4 large drives (but
also w/ 4 gigE ports per server).
The obvious thought is to use Gluster to assemble all the drives into
one large storage pool, with replication. But.. last time I looked at
this (6 months or so back), it looked like some of the critical
features were brand new, and performance seemed to be a problem in the
configuration I'm thinking of.
Which leads me to my question: Has the situation improved to the
point that I can use Gluster this way?
Thanks very much,
Miles Fidelman
Hi,
I have a XenServer pool (3 servers) talking to an GlusterFS replicate
server over NFS with uCARP for IP failover.
The system was put in place in May 2012, using GlusterFS 3.3. It ran
very well, with speeds comparable to my existing iSCSI solution
(http://majentis.com/2011/09/21/xenserver-iscsi-and-glusterfsnfs/
I was quite pleased with the system, it worked flawlessly. Until
November. At that point, the Gluster NFS server started stalling under
load. It would become unresponsive for a long enough period of time
that the VM's under XenServer would lose their drives. Linux would
remount the drives read-only and then eventually lock up, while Windows
would just lock up. In this case, Windows was more resilient to the
transient disk loss.
I have been unable to solve the problem, and am now switching back to a
DRBD/iSCSI setup. I'm not happy about it, but we were losing NFS
connectively nightly, during backups. Life was hell for a long time
while I was trying to fix things.
Gerald
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