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.
Ah, answering my own question. Upgrading to CentOS 4.5 actually clears this up.
Also, someone e-mailed me saying the option should be "max_luns" instead of "max_scsi_luns", for anyone struggling with this in the future.
Eric Solomon wrote:
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