Adam Huffman wrote:
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
Adam,
I'm not sure of the why, but this link may help solve the problem. Maybe the initrd for the latest kernel was not built with the max_luns option.
http://publib.boulder.ibm.com/infocenter/dsichelp/ds8000ic/index.jsp?topic=/...
Read the man page on mkinitrd. I'd rename the originals before rebuilding. If you're daring, you'll the -f option to mkinitrd to rebuild over the originals.
Bob...