Dell TL2000 manual Red Hat Enterprise Linux, Enabling LUN Support in Netware

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.

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