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Re: RHEL3 dynamically rescan scsi bus to mount cluster luns



Hi,

This may end up as a double post as my first attempt appears to be caught in
limbo ­ so my apologies now if that is the case.

I¹m currently in the process of setting up a 2 node cluster but have run
into a few problems.
The nodes are in different sites running RHEL3 AS and connected by fibre to
EMC Clarion arrays with PowerPath doing the multipathing - the cluster
software being used is Legato AAM.
The arrays are running MirrorView to replicate the data between each array
with one a primary and the other a secondary.

At the moment I can attach the luns to the first node and mount the ext3
filesystem, but when attempting to failover to the secondary node I¹m unable
to mount the filesystem ­ if the secondary node is rebooted it can then
mount the filesystem. I think this may be related to how MirrorView manages
the primary and secondary arrays. For example if the primary node is active
the secondary node is unable to access the lun.
So when failover occurs I don¹t believe the secondary node has the luns
loaded into the kernel, which means I need to somehow rescan the luns before
they can be mounted (I guess the equivalent command in Solaris would be
devfsadm).

Does anyone have any ideas whether this is possible and how I would go about
doing it?
Thanks for you time.

Simon



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