[CentOS] HP SureStore 40x6e - Multiple LUN's problem on CentOS 4.4

Eric Solomon eric at clickability.com
Tue Jun 5 17:23:22 UTC 2007

This is one of those autoloaders where the tape drive and the library 
share a SCSI ID, but are on different LUN's - specifically the library 
should be on LUN 1.  Apparently since so many devices like this are 
broken,  recent kernels don't probe beyond the first LUN, so it's not 
detecting the library.

My /proc/scsi/scsi output:

Attached devices:
Host: scsi4 Channel: 01 Id: 00 Lun: 00
  Vendor: MegaRAID Model: LD 0 RAID1   70G Rev: 1L47
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi5 Channel: 00 Id: 05 Lun: 00
  Vendor: HP       Model: C5713A           Rev: H910
  Type:   Sequential-Access                ANSI SCSI revision: 02

I read somewhere that this shouldn't be a problem with RHEL 4, but I 
can't seem to get it detected.  I tried to add

options scsi_mod max_scsi_luns=6

to modprobe.conf and regenerated initrd - no change.  Tried adding

max_luns=6 max_report_luns=6

to the kernel line in grub.conf, no change.  I tried to manually add it 
by doing:

echo "scsi add-single-device 0 0 5 1" > /proc/scsi/scsi

but again, no change.

Any suggestions?  Am I on the right track and just doing something 
wrong?  I know recompiling the kernel is not the best thing, but not 
sure what to do here.  Thanks.

Eric Solomon
Senior Unix Engineer



Simplifying Content Management

130 Battery Street, Suite 300 San Francisco CA 94111
Tel  415-575-5125    eric at clickability.com
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