31 May
2007
31 May
'07
3:45 p.m.
After updating to Centos 4.5, I found that one of the LUNs on an external SCSI array wasn't being detected. If I add the device manually after boot
echo "scsi add-single-device 0 0 1 1" > /proc/scsi/scsi
it is detected. I can then use the LVM tools to activate it and then mount the LV on the device.
It doesn't seem to be kernel related as I rebooted into a 4.4 kernel and the same thing happened. There's no error message I can see at boot, it just doesn't see the device.
It's using a QLogic HBA but with the upstream module, not the out-of-tree QLogic one. It worked fine under 4.4.
I suspect changes to dmsetup and/or multipath. Has anyone else seen something similar?
Adam