[Ocfs2-users] CRS/CSS and OCFS2
Sunil Mushran
Sunil.Mushran at oracle.com
Tue May 27 13:07:25 PDT 2008
AFAIK:
a. There is no force umount in Linux.
b. There is no way to know whether a local fs is mounted on another node.
Luis Freitas wrote:
> Alexandra,
>
> You could use only CRS and ext3 instead of ocfs2 for this kind of
> use. You would need to register a script to force umount the
> filesystem on the primary node and mount it on the node you are
> failing over to, it would be nice to be able to check if the
> filesystem is mounted before atempting to mount it, but I am not sure
> on how to do this)
>
> Are you using a cross-over cable for the private interconnect?
>
> Regards,
> Luis
>
> --- On *Fri, 6/27/08, alexandra.strauss at bayerbbs.com
> /<alexandra.strauss at bayerbbs.com>/* wrote:
>
> From: alexandra.strauss at bayerbbs.com <alexandra.strauss at bayerbbs.com>
> Subject: [Ocfs2-users] CRS/CSS and OCFS2
> To: ocfs2-users at oss.oracle.com
> Date: Friday, June 27, 2008, 10:41 AM
>
>
> Hello,
>
> I refer to you hoping you may help me with my problem... We have
> got an issur here and opened a SR at Metalink but until now, we
> got no useful information in solving our problem. SR-Number is
> 6855815.994...
>
> We wanted to protect 9i Single-Instance Databases with 10g
> Clusterware following the third-party-tool approach. There are no
> RAC-databases involved. But we want to achieve high availability
> as the databases are business critical systems. We want to make
> the systems able to
> relocate to another machine in case of failure to keep downtimes
> low... To achieve this we want to use OCFS2 for the filesystem.
> Relocate is done by script with help of CRS.
>
> So we took two systems (byaz05 and byaz10) and installed the
> following software: 10g CRS (10.2.0.3) and Oracle Software 9.2.0.8
> and OCFS2 1.2.8
>
> We found the following Metalinknotes and adjusted the heartbeat
> and timeouts for OCFS2: Metalink Note 395878.1:
> Heartbeat/Voting/Quorum Related Timeout Configuration for Linux,
> OCFS2, RAC Stack to avoid unnessary node fencing, panic and reboot
> Metalink Note 391771.1: OCFS2 - FREQUENTLY ASKED QUESTIONS (hier
> insbesondere der Abschnitt zu Fencing und Quorum)
> Metalink Note 434255.1: Common reasons for OCFS2 Kernel Panic or
> Reboot Issues
> Metalink Note 457423.1: OCFS2 Fencing, Network, and Disk Heartbeat
> Timeout Configuration
>
> We did no changes to the CRS/CSS default settings until now.
>
> During HA-testing we watched unexpected behaviour of the system.
> We deactivated the bond for private interconnect and expected only
> one node to go down. But we faced both nodes going down. As it
> seems to me one node was rebooted from OCFS2 and the other one
> from CRS/CSS.
>
> Timestamp
> --------------------------------------------------------------------------------------------------------------
>
> 10:21:06 bond1 disabled (eth1)
> */var/log/messages byaz05*
> Apr 25 10:21:06 byaz05 kernel: bonding: bond1: link status
> definitely down for interface eth1, disabling it
> Apr 25 10:21:06 byaz05 kernel: bonding: bond1: making interface
> eth5 the new active one.
>
> 10:21:09 bond1 disabled (eth5)
> */var/log/messages byaz05*
> Apr 25 10:21:09 byaz05 kernel: bonding: bond1: link status
> definitely down for interface eth5, disabling it
> Apr 25 10:21:09 byaz05 kernel: bonding: bond1: now running without
> any active interface !
>
> 10:21:23 o2net – no longer connected
> */var/log/messages byaz05*
> Apr 25 10:21:23 byaz05 kernel: o2net: no longer connected to node
> byaz10.bayer-ag.com (num 1) at 10.190.59.6:7777
> */var/log/messages byaz10*
> Apr 25 10:21:23 byaz10 kernel: o2net: no longer connected to node
> byaz05.bayer-ag.com (num 0) at 10.190.59.5:7777
>
> 10:21:27 CSSD failure 134
> 10:21:29 Reboot initiated by CRS
> */var/log/messages byaz05*
> Apr 25 10:21:27 byaz05 logger: Oracle clsomon failed with fatal
> status 12.
> Apr 25 10:21:27 byaz05 logger: Oracle CSSD failure 134.
> Apr 25 10:21:27 byaz05 su(pam_unix)[25839]: session closed for
> user oracle
> Apr 25 10:21:27 byaz05 logger: Oracle CRS failure. Rebooting for
> cluster integrity.
> Apr 25 10:21:27 byaz05 kernel: md: stopping all md devices.
> Apr 25 10:21:27 byaz05 kernel: md: md0 switched to read-only mode.
> Apr 25 10:21:29 byaz05 logger: Oracle CRS failure. Rebooting for
> cluster integrity.
> Apr 25 10:21:29 byaz05 kernel: e1000: eth2: e1000_watchdog_task:
> NIC Link is Up 1000 Mbps Full Duplex
> Apr 25 10:21:29 byaz05 logger: Oracle init script ceding reboot to
> sibling 27383.
>
> 10:21:58 Reboot initiated by OCFS2(?)
> */var/log/messages byaz10*
> Apr 25 10:21:58 byaz10 su(pam_unix)[4595]: session opened for user
> oracle by (uid=0)
> Apr 25 10:21:58 byaz10 su(pam_unix)[4595]: session closed for user
> oracle
> Apr 25 10:25:58 byaz10 syslogd 1.4.1: restart.
> Apr 25 10:25:58 byaz10 syslog: syslogd startup succeeded
> Apr 25 10:25:58 byaz10 kernel: klogd 1.4.1, log source =
> /proc/kmsg started.
> Apr 25 10:25:58 byaz10 kernel: Bootdata ok (command line is ro
> root=/dev/vgroot/_)
>
>
> We supposed all the time this is a timing problem. But we don't
> know which settings raise the problem and which steps to do to to
> correct them. Otherwise we'll have to work over the complete
> concept for the business critical systems.
> Can anyone help me?
>
> Regards,
> Alexandra
>
>
>
>
>
>
>
>
>
>
>
>
>
> Freundliche Grüße / Best Regards
>
> Alexandra Strauss
> _________________________________________
>
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