From: Mark Fasheh <mark.fasheh@oracle.com>
To: ocfs2-devel@oss.oracle.com
Subject: [Ocfs2-devel] heartbeat.
Date: Wed Sep 6 09:15:11 2006 [thread overview]
Message-ID: <20060906161507.GD8792@ca-server1.us.oracle.com> (raw)
In-Reply-To: <44FE73D5.2020602@seanodes.com>
Hi Mathieu,
On Wed, Sep 06, 2006 at 09:08:05AM +0200, Mathieu Avila wrote:
> Hello OCFS2 team,
>
> I'm currently looking at the OCFS2 code in linux-2.6.17.11, and i wander
> why OCFS2 performs its heartbeat on a disk region unlike on the network
> like many clustered services stack do. What is the requirement for a
> disk heartbeat ? Is there any way to tune this behaviour and change it
> into a network heartbeat ?
The OCFS2 cluster stack heartbeats on both disk and network. Disk is
generally thought to have the final say as to whether a node is alive or
not. The reason we heartbeat on disk is because we want to be sure a
connection to the disk is maintained. Otherwise, the cluster could hang
indefinitely if the disk cable from one mounted node is unplugged - it
wouldn't be able to write out shared meta data for other nodes to read.
That all said, we're likely to remove the disk heartbeat in favor of a read
only mechanism in a future release of OCFS2.
--Mark
--
Mark Fasheh
Senior Software Developer, Oracle
mark.fasheh@oracle.com
prev parent reply other threads:[~2006-09-06 9:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-06 0:12 [Ocfs2-devel] heartbeat Mathieu Avila
2006-09-06 9:15 ` Mark Fasheh [this message]
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