From: Sunil Mushran <sunil.mushran@oracle.com>
To: ocfs2-devel@oss.oracle.com
Subject: [Ocfs2-devel] Global heartbeat - drop#1
Date: Thu, 29 Jul 2010 10:28:09 -0700 [thread overview]
Message-ID: <4C51BA29.5080506@oracle.com> (raw)
In-Reply-To: <20100729030845.GA2591@laptop.jp.oracle.com>
On 07/28/2010 08:08 PM, Wengang Wang wrote:
>
>> One case I can see happening is if the journal op fail (say commit
>> triggered by downconvert). In that case, the fs will fence the box.
>>
>> Do you have a specific example?
>>
> I have no good example, but just thinking about this case:
>
> A two nodes HA cluster, node A is active and node B is backup.
> If the non-hb device fails on node A, since no failover will happen in this
> case, the app will keep getting the EIOs on the active node. User maybe
> complain with that? With lhb, node A will be restarted and failover will happen
> so that user app won't keep getting EIOs.
>
> Or all nodes are active nodes, but they all get EIOs since no fence in this case.
>
> It is just a question, not a big problem for the helpful ghb :)
>
>
o2hb is meant only for ocfs2. If one wants app failover, then one
can use clusterware or rgmanager or pacemaker. Or one can hand
craft app failover on ocfs2 using dlmfs. I know users that are doing so.
next prev parent reply other threads:[~2010-07-29 17:28 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-23 23:55 [Ocfs2-devel] Global heartbeat - drop#1 Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 1/8] ocfs2/cluster: Add heartbeat mode configfs parameter Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 2/8] ocfs2: Add an incompat feature flag OCFS2_FEATURE_INCOMPAT_CLUSTERINFO Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 3/8] ocfs2: Add support for heartbeat=global mount option Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 4/8] ocfs2/dlm: Expose dlm_protocol in dlm_state Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 5/8] ocfs2/cluster: Get all heartbeat regions Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 6/8] ocfs2/dlm: Add message DLM_QUERY_HBREGION Sunil Mushran
2010-07-28 16:21 ` Wengang Wang
2010-07-28 16:47 ` Sunil Mushran
2010-07-29 5:03 ` Wengang Wang
2010-07-29 17:22 ` Sunil Mushran
2010-07-30 1:55 ` Wengang Wang
2010-07-29 5:08 ` Wengang Wang
2010-07-29 17:24 ` Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 7/8] ocfs2: Print message if user mounts without starting global heartbeat Sunil Mushran
2010-07-23 23:55 ` [Ocfs2-devel] [PATCH 8/8] ocfs2/dlm: Add message DLM_QUERY_NODEINFO Sunil Mushran
2010-07-29 6:49 ` Wengang Wang
2010-07-29 18:59 ` Sunil Mushran
2010-07-28 14:45 ` [Ocfs2-devel] Global heartbeat - drop#1 Wengang Wang
2010-07-28 16:40 ` Sunil Mushran
2010-07-29 3:08 ` Wengang Wang
2010-07-29 17:28 ` Sunil Mushran [this message]
2010-07-30 1:58 ` Wengang Wang
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