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We have recently upgraded to new hardware – IBM model 8203 with Power 6 processors – to support a failover configuration using two servers:
a primary and a secondary. We are running CIS 5.6 Rev2 on AIX5.3 TL8 SP3. We developed a procedure that includes unmounting and mounting a SAN pool of disks that contains all of our sites from the root. We use symbolic links from the root filesystem to each site that also resides on its own filesystem. Historically, this was done to reduce disk I/O demands and aid in site management in general.
We have observed that once we unmount our SAN from our primary box and then mount this SAN on our secondary box, we lose the message statistics. We assumed (!) that these statistics would be preserved across mount events. In doing some research, we know that a pipe file – monitorShmemfile – allows the monitor daemon to communicate with the processes/threads in the site and the “msi” region for the site. The identification of exactly where this region exists escapes us. Again, we do a totally manual failover for maintenance purposes mostly but also as an option in the event of a primary hardware failure. Note that for this failover, we did not perform any engine initializations or memory scrubs.
We have checked the posts in this forum regarding the MSI but have not come up with any answers.
Ok… short question:
is it possible to preserve the message statistics during a failover that involves an unmount/mount event?
Thanks in advance for any information on this question.
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