[Ocfs-users] I'd like to stop the OCSF2_disk_heart_beat.

[ohue.hidetoshi at jp.fujitsu.com]

To Sunil. 
This is Hide.

Thank you for a quick reply. 

I understood that the function that I hoped for was already shown. 
I examine it about userspace clusterstacks,pacemaker and cman. 

And I understood the mailing list mistake. 
(I mail only this reply in this mailing list.) 

Thank you.

>Date:    Wed, 15 Apr 2009 11:30:37 -0700
>From:    Sunil Mushran <sunil.mushran at oracle.com>
>Subject: Re: [Ocfs-users] I'd like to stop the OCSF2_disk_heart_beat.

>The disk heartbeat is the node liveness detection component in o2cb
>(ocfs2's native cluster stack). If you want to run it like a local fs,
>say ext3, then you can use tunefs.ocfs2 to change the mount type to local.
>That will disable the hb thread.
>
>But that's not what you want. You want to run in clustered mode, but
>only disable the hb thread when one node is active. If I am understanding
>you correctly.
>
>If so, then the solution maybe found in one of the userspace clusterstacks,
>pacemaker or cman. In 2.6.26 or so, we added support for userspace cluster
>stacks. Novell is about to ship SLES11 HA that will showcase ocfs2 with
>pacemaker (novell's cluster stack). Sometime next year, we'll have the same
>on (rh)el6 - ocfs2 with cman. These two cluster stacks have been known to
>have config setting that does not require disk heartbeat. Or atleast allows
>users to setup one disk as the quorum disk and not have the hb on all disks.
>That may satisfy your requirements.
>
>BTW, the correct mailing list is ocfs2-users at oss.oracle.com.
>
>Sunil
>
>ohue.hidetoshi at jp.fujitsu.com wrote:
>> This is Hide. 
>> This is the first contribution. 
>>
>> I'd like to configure cluster file system by OCFS2.
>> The number of nodes are two.
>> CompactFlash card(CF) is used as shared DISK.
>> Guarantees of the writing frequency to CF are up to 100,000 times.
>> However, it exceed in two day, due to the disk_heart_beat executed every two seconds.
>>
>> I tried following procedures to solve that. It seems solved.
>>  1. O2HB_DEFAULT_DEAD_THRESHOLD changed larger than previous value. It's defined in hearbeat.h.
>>  2. The Skip_flag defined as a global parameter.
>>  3. When the number of connected nodes becomes two , skip_flag is turned on by dlmdomain.c
>>  4. If the skip_flag is ON, the o2hb_do_disk_hearbeat is not executed.
>>  5. When the number of connected nodes becomes below two, skip_flag is turned off by dlmdomain.c.
>>  6. If the skip_flag is OFF, the o2hb_do_disk_hearbeat is executed.
>>
>> If one node is active, the o2hb_do_disk_hearbeat is executed in any condition.
>> I wouldn't like to execute the o2hb_do_disk_hearbeat, even if one node is active.
>> Because to take away writing frequency problem.
>> However, if the o2hb_do_disk_hearbeat is not executed, I can't supervision
>> when the other node is active.
>> So, I'd like to know that how can I supervision it without o2hb_do_disk_hearbeat.
>>
>> I think one of plan is supervision by IP communication.
>> Is there any effective source in tcp.c?
>> Do you have any other plan?
>>
>> *The version is the following. 
>>  Linux-2.6.21.7
>>  ocfs2-tools-1.2.3
>>
>> If you have any good idea, please give it for me.