SCSI
Resetting/Rescanning
Say you've got a tape drive and it wanders off into oblivion (as mine seem to do quite often), this might work.
- find the wacky 4 number code that denotes the device in question. The wacky number is the host, channel, id and lun.
Either look for a line like this:
st 1:0:6:0: Attached scsi tape st0
in the output from dmesg.
Or look in /proc/scsi/scsi for the host, channel, id and lun.
Host: scsi1 Channel: 00 Id: 06 Lun: 00 Vendor: HP Model: Ultrium 1-SCSI Rev: E21V Type: Sequential-Access ANSI SCSI revision: 03
The magic number we want is 1 0 6 0.
- remove the device from the kernel like this...
echo "scsi remove-single-device 1 0 6 0" > /proc/scsi/scsi
- re-add the device to the kernel like this...
echo "scsi add-single-device 1 0 6 0" > /proc/scsi/scsi
Check Consistency
I was having a lot of trouble with Zephir. New kernels seemed to hate the Megaraid drive. I tried booting to the raid card interface and running the consistency check. This took a long time, but after it was over it said "Corrected" and Zephir stopped complaining. CONCLUSION! Run that feature every now and again...