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тАО11-03-2009 01:40 AM
тАО11-03-2009 01:40 AM
SAN mounts connection problem
i have RHEL AS 4.8 server connected to DMX4 EMC SAN storage through dual switches and dual fibre cards and dual connections, if anyone of these connections lost these file systems will be mount in read only mode, how to change this option to be mounted as a read/write mode, as in hp-ux , i hear that tune2fs could do this , but i do not get the exact suitable option , kindly advice.
BR;
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тАО11-03-2009 03:01 AM
тАО11-03-2009 03:01 AM
Re: SAN mounts connection problem
hope that helps
regards
Matt
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тАО11-03-2009 03:05 AM
тАО11-03-2009 03:05 AM
Re: SAN mounts connection problem
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тАО11-03-2009 04:27 AM
тАО11-03-2009 04:27 AM
Re: SAN mounts connection problem
The system remembers that an error has been detected on a filesystem and will not let you mount it read/write until you run a fsck on that filesystem.
The root cause of your read-only problem is a failure of your multipath configuration.
If you are familiar with PowerPath in HP-UX, be aware that works very differently in Linux. You *must* use the /dev/emcpower* device names to get the benefit of PowerPath multipathing: if you use /dev/sd* devices, PowerPath is completely bypassed and it cannot help you when a path fails.
If you use traditional partitions, are the disks mounted using /dev/emcpower* device names?
If you use LVM, does the command
vgdisplay -v | grep "PV Name"
list /dev/emcpower* device names for all SAN PVs?
(If you haven't already done so, you may have to write a custom filter statement in /etc/lvm/lvm.conf to make the LVM use /dev/emcpower* devices and ignore the respective /dev/sd* devices.)
MK
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тАО11-03-2009 04:52 AM
тАО11-03-2009 04:52 AM
Re: SAN mounts connection problem
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тАО11-03-2009 04:55 AM
тАО11-03-2009 04:55 AM
Re: SAN mounts connection problem
which FC HBAs are you using? I have had problems with the FC adapter trying to manage the failover instead of MPIO when using Qlogic cards.
regards
Matt
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тАО11-03-2009 04:59 AM
тАО11-03-2009 04:59 AM
Re: SAN mounts connection problem
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тАО11-03-2009 05:07 AM
тАО11-03-2009 05:07 AM
Re: SAN mounts connection problem
have you checked in the logs that the powerpath licence doesnt have an issue. I found the following resource on the web:
http://blog.thilelli.net/post/2009/02/09/Comparison:-EMC-PowerPath-vs-GNU/Linux-dm-multipath
"Keep in mind that without purchasing an appropriate EMC license, PowerPath can only be used in failover mode (active-passive mode). Multiple paths accesses are not supported in this case: no round-robin, and no I/O load balancer for example."
regards
Matt
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тАО11-03-2009 06:37 AM
тАО11-03-2009 06:37 AM
Re: SAN mounts connection problem
Have you verified that PowerPath really can access the LUNs through both fibre cards?
What does "powermt display dev=all" say?
MK