[CentOS-virt] GFS2 hangs after one node going down
zoltan at frombach.com
Thu Mar 21 23:50:13 UTC 2013
It's not related to your problem. Just a note: when you use the noatime
mounting option in fstab then you do not need to use nodiratime because
noatime takes care of both.
On 3/21/2013 6:48 PM, Maurizio Giungato wrote:
> Il 21/03/2013 18:14, Digimer ha scritto:
>> On 03/21/2013 01:11 PM, Maurizio Giungato wrote:
>>> Hi guys,
>>> my goal is to create a reliable virtualization environment using CentOS
>>> 6.4 and KVM, I've three nodes and a clustered GFS2.
>>> The enviroment is up and working, but I'm worry for the reliability, if
>>> I turn the network interface down on one node to simulate a crash (for
>>> example on the node "node6.blade"):
>>> 1) GFS2 hangs (processes go in D state) until node6.blade get fenced
>>> 2) not only node6.blade get fenced, but also node5.blade!
>>> Help me to save my last neurons!
>> DLM, the distributed lock manager provided by the cluster, is
>> designed to block when a known goes into an unknown state. It does
>> not unblock until that node is confirmed to be fenced. This is by
>> design. GFS2, rgmanager and clustered LVM all use DLM, so they will
>> all block as well.
>> As for why two nodes get fenced, you will need to share more about
>> your configuration.
> My configuration is very simple I attached cluster.conf and hosts files.
> This is the row I added in /etc/fstab:
> /dev/mapper/KVM_IMAGES-VL_KVM_IMAGES /var/lib/libvirt/images gfs2
> defaults,noatime,nodiratime 0 0
> I set also fallback_to_local_locking = 0 in lvm.conf (but nothing change)
> PS: I had two virtualization enviroments working like a charm on
> OCFS2, but since Centos 6.x I'm not able to install it, there is same
> way to achieve the same results with GFS2 (with GFS2 sometime I've a
> crash after only a "service network restart" [I've many interfaces
> then this operation takes more than 10 seconds], with OCFS2 I've never
> had this problem.
> CentOS-virt mailing list
> CentOS-virt at centos.org
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