Comments on: What’s in a voting disk?

By: naveen

naveen — Fri, 26 Apr 2013 14:13:41 +0000

hi if voting disk misses instance will work or not tell me plzzzzzzzzzzzzzz

By: PC

PC — Sat, 09 Feb 2013 16:55:29 +0000

Hi Riyaj,

You mention that “It is preferable to have at least 3 voting disks or odd number of voting disks greater than or equal to 3.” So is it correct to say that having odd number of VD is NOT mandatory?

Also, pls help understand as to what would happen if 1 of the 3 VD is lost (but there is no other failure).

Thanks

By: Riyaj Shamsudeen

Riyaj Shamsudeen — Wed, 20 Jun 2012 15:04:42 +0000

Hello Yuri
Note 294430.1 discusses in detail. I will summarize to answer your question.
css misscount parameter determines network heartbeat, defaults to 30 seconds. disk timeout is 200 seconds.
If network heartbeat is missed after a timeout of 30 seconds, reboot is initiated (approximately, it is 34 seconds). It doesn’t matter what happens with disk heartbeat.
For the disk heartbeat (voting disk): If the heartbeat did not complete in 200 seconds then the node will be rebooted.
If the disk heartbeat completes under 200 seconds,then the reboot will not happen as long as network heartbeat is successful.
This is little bit different at cluster reconfiguration time. Also, if there is a vendor clusterware in play, then misscount is set to 600 seconds.

Cheers
Riyaj

By: Yuri Pudovchenko

Yuri Pudovchenko — Wed, 20 Jun 2012 11:41:44 +0000

Hi, Ryaj,

Excellent post !
but what occurs if

- Network heart beat is successful, but disk heart beat is missed.
- Disk heart beat is successful, but network heart beat is missed.

I long time seek answer for these questions.

Thanks !

By: Aman....

Aman.... — Sun, 14 Aug 2011 16:43:23 +0000

Riaz,

Can you shed some more light on the part where you mentioned that teh nodes are divided into groups?

Aman….

By: Anand

Anand — Fri, 21 Jan 2011 15:56:19 +0000

Hi Sir,

I had read this article the day you had posted it, but forgot to ask who to check the pread/pwrite contents of the voting disk?

Regards,
Anand

By: Log Buffer #205, A Carnival of the Vanities for DBAs | The Pythian Blog

Log Buffer #205, A Carnival of the Vanities for DBAs | The Pythian Blog — Fri, 05 Nov 2010 13:46:17 +0000

[...] It’s always very informative and exciting to know about internals of RAC Stuff like what actually is maintained in the Voting Disk . Riyaj has it here. [...]

By: bernard polarski

bernard polarski — Fri, 05 Nov 2010 08:28:20 +0000

Many thanks for sharing this. The hazards of assignments put me away from RAC so articles like this are important to keep in touch with a feature I will certainly meet again.

By: Greg

Greg — Sat, 30 Oct 2010 09:21:53 +0000

Hi,
very informative as always .
Thank You.
GregG