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[dm-devel] Multipath / iSCSI issues




I am running Oracle Enterprise Linux 5.8 (which is really just Redhat). I am using Multipath and I have LUNS presented to me via iSCSI from a Hitachi SAN. I have the NICS bonded using the Linux bonding driver and using Active-Backup mode. I notice that when I loose a switch or connection to one of the switches that multipath freezes for at least 60 seconds before it starts to respond again. Also it appears that IO being generated freezes until multipath responds again, this pause up to 60 seconds is causing my Oracle instances to crash.

I have not been able to easily find what settings i could possibly change to make it fail to a new path faster. It almost seems like it's taking multipath a bit to fail all IO to a new path that is working.

Is there any information that might be useful for me that I can check on either the multipath side or the iSCSI side to see what is causing the issue???


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