On 02/24/2013 01:15 PM, Devin wrote: > > 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??? > What iscsi driver are you using? If you are using software iscsi that comes with OEL 5.8 what are our node.session.timeo.replacement_timeout, .timeo.noop_out_timeout and .timeo.noop_out_interval. And what is your scsi command timeout. You can see that by doing: cat /sys/block/sdX/device/timeout -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
