On 07/04/2015 08:41 AM, SATHEESARAN wrote:
On 07/02/2015 03:32 PM, Gregor Burck wrote:
Hi,
I would like to ade some test with glusterfs and virtualbox.
The goal is to store the virtualbox files in a glusterfs store and
access it from to machines.
In my setup, the servers are the clients too. I hope you could
understand my description:
I remount the share back to the single machines
two machines:
gf001 and gf002
Both:
debian 8
glusterfs 3.7
/dev/sda - root
/dev/sdb - /export/vbstore
My volume info:
root@gf001 :~# gluster volume info vbstore
Volume Name: vbstore
Type: Replicate
Volume ID: 7bf8aa42-8fd9-4535-888d-dacea4f14a83
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: gf001.mvz.ffm:/export/vbstore
Brick2: gf002.mvz.ffm:/export/vbstore
Options Reconfigured:
cluster.server-quorum-type: server
cluster.quorum-type: auto
network.remote-dio: enable
cluster.eager-lock: enable
performance.stat-prefetch: off
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
performance.readdir-ahead: on
mounting on gf001:
mount -t glusterfs gf001:/vbstore /import/vbstore
or via fstab:
gf001:/vbstore /import/vbstore glusterfs defaults 0 0
The same on gf002 with gf002 as server.
Creating an virtualbox VM in /import/vbstore.
Starting VM on gf001 OR gf002 work right.
But when running VM on one AND shut down the opposit, the VM crash
with ATA failure.
Maybe mount or gluster setting options?
Thank you for help,
Gregor
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Hi Gregor,
Volume info shows that server-side quorum and client-side quorum are
enabled.
Missed a clear description here - When you shutdown one of the node in a
2 node cluster with quorums enabled,
you will face the following situation.
If there are only 2 nodes ( gf001 & gf002 ) are there in the cluster,
then
server-side quorum is not met, which would result in killing bricks of
the volumes.
You can check this from 'gluster volume status <vol-name>'
Also client-side quorum has a limitation with replica 2 volume, that
the first brick of the replicate
should always be up. In your case, if you shutdown gf001, then the
client-side quorum will not be met and
that would result in gluster volume becoming read-only
Under these situation, VM should not crash, but will go paused as the
storage is inaccessible ( read-only in the case of client quorum not
met )
Hope that helps.
Thanks,
Satheesaran S
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http://www.gluster.org/mailman/listinfo/gluster-users
