We're having a problem with recent (linux-2.4.0-test2) scsi_scan.c,
centered around this change:
/*
* We used to do a TEST_UNIT_READY before the INQUIRY but that was
* not really necessary. Spec recommends using INQUIRY to scan for
* devices (and TEST_UNIT_READY to poll for media change). - Paul G.
*/
This change has caused additional "ghost" LUNs to be seen by linux.
We have a RAID subsystem that happens to return (e.g.):
SCSI Error Report =-=-= (ioc0,scsi0:4)
SCSI_Status=02h (CHECK CONDITION)
Original_CDB[]: 00 80 00 00 00 00 - "TEST UNIT READY"
SenseData[A0h]: 70 00 05 00 00 00 00 98 00 00 00 00 25 00 00 00 00 00 ...
SenseKey=5h (ILLEGAL REQUEST); FRU=00h
ASC/ASCQ=25h/00h "LOGICAL UNIT NOT SUPPORTED"
to TEST_UNIT_READY (and READ_CAPACITY, et al), which *used* to cause linux
to ignore the LUN.
We kindly request that TEST_UNIT_READY *before* INQUIRY be reinstated.
Thanks,
-SteveR
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