Dell TL2000 - Manual (Page 240)

Red Hat Enterprise Linux
RHEL doesn’t automatically probe all LUNs on SCSI devices. The symptom shows
LUN 0, which would be the drive, but not the loader.
1. Type #cat /proc/scsi/scsi .
Attached devices:
Host: scsi0 Channel: 00 Id: 06 Lun: 00
Vendor: CERTANCE Model: ULTRIUM 2 Rev: 1826
Type: Sequential-Access ANSI SCSI revision: 03
2. You will need to add the following to /etc/modules.conf
options scsi_mod max_scsi_luns=255
Note: In RHEL 4, it is max_luns=255
3. Once that’s added, you will have to rebuild the initrd and reboot the server.
There is a way to test this before editing the files and rebooting, but there’s too
much of a risk of taking down other SCSI devices in the process. Rebuilding
the initrd will be the tricky part. You have to know exactly which kernel
version you want to use to do this properly. You can find out the kernel version
by using the uname command.
#uname -r
2.4.9-e.38
Note: There is a list of known kernel versions on the Red Hat Enterprise Linux
page.
4. So, given the version is 2.4.9-e.38
# cp /boot/initrd-2.4.9-e.38.img /boot/initrd-2.4.9-e.38.img.bak
# mkinitrd -f -v /boot/initrd-2.4.9-e.38.img 2.4.9-e.38
This should give some output, then go to a new prompt. If it gives any errors,
check the syntax you put into /etc/modules.conf or contact someone
knowledgeable with Linux.
5. If successful, the server WILL need to be rebooted. Once it comes back up,
check /proc/scsi/scsi again.
#cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 06 Lun: 00
Vendor: CERTANCE Model: ULTRIUM 2 Rev: 1826
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 06 Lun: 01
Vendor: DELL Model: PV-124T Rev: V31
Type: Medium Changer ANSI SCSI revision: 03
Enabling LUN Support in Netware
1. From the System Console, verify the LUN device is not being detected by using
the list storage adapters command. Typical output where only the tape drive is
being recognized:
0x08 [V321-A3] Adaptec SCSI Card 39160/3960D - Ultra160 SCSI [slot 201]
0x15 [V321-A3-D5:0] IBM ULTRIUM-TD3 5BG2
0x09 [V321-A4] Adaptec SCSI Card 39160/3960D - Ultra160 SCSI [slot 202]
2. From the System Console, type nwconfig .
3. Select NCF files Options from the Configuration Options screen.
4. Select Edit STARTUP.NCF from the Available NCF Files Options screen.
D-2 Dell PowerVault TL2000 Tape Library and TL4000 Tape Library User's Guide