Hi,
Using the qla2xxx driver from Linux 3.10.1 (release), if a LUN from the
target side (multiple drives exported over a LIO IBlock qla2xxx export)
is removed at the LIO level, the initiator side will not automatically
detect that this LUN was removed.
All commands to this LUN will fail (sg_inq, read, writes) but the
qla2xxx will never kick the drive out.
If another drive was to be exported on the target side using the same
lun as the previously removed drive, commands sent to the same block id
would now work again but be sent to the new LUN.
I tried to echo "- - -" in the scsi_host sysfs "scan" file corresponding
to the FC port. This worked to detect new LUNs but not to "clear"
removed ones.
I tried issuing a lip_reset on both sides, but no change.
Looking through Google, I realized that, on RedHat, a /proc/scsi/qla2xxx
virtual FS exists which allows to send a "scsi-qlascan" command to the
driver that apparently can detect removed LUNs. Unfortunately I don't
have this FS visible on my Linux kernel, and I made sure /proc/scsi was
enabled.
The only way I found was to "echo 1 > /sys/block/sdX/device/delete" to
the stale device (that corresponds to the removed LUN from the target
side), then replace the removed LUN on the target side before finally
issuing a "scan" command on the initiator side.
Am I missing something here? Is there a way to rescan a Qlogic FC port
using the "qla2xxx" driver from the official, stock kernel?
Thank you very much in advance for your help!
Regards,
Ben - MPSTOR
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