bridge fc/scsi

[Denis Goffinet]

Hello,

I am trying to use SAN backup on RedHat 7.3. Drives are connected on the SAN through a fc/scsi bridge. On boot, I only detect the bridges and not the drives connected behind ( bridges should be invisible as is on HP-UX, Suse LES8)

Here is a part of dmesg:

scsi3 : QLogic QLA2200 PCI to Fibre Channel Host Adapter: bus 2 device 5 irq 24
Firmware version: 2.02.03, Driver version 6.04.02
Vendor: HP Model: A4689A Rev: 008r
Type: Processor ANSI SCSI revision: 00
Vendor: HP Model: A4689A Rev: 008r
Type: Processor ANSI SCSI revision: 00
Vendor: HP Model: A4689A Rev: 008r
Type: Processor ANSI SCSI revision: 00

Does anybody already encounter this problem?

[Paulo A G Fessel]

What are your LUN ID's?

Linux will not detect by default any LUN ID > 8.

In order to do this, you must have this enabled on your kernel:

CONFIG_SCSI_MULTI_LUN=y

which translates to "SCSI support/Probe all LUN's in each SCSI device" in make menuconfig.

HTH
Paulo Fessel

[Stuart Browne]

This thread came up recently, have a look at this thread:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=229986

[Denis Goffinet]

As the box doesn't exist anymore ( we switched it in suse linux enterprise server 8), the problem does not occurs anymore.

Paulo > I think that this was not our problem. The kernel was already modified to allow us to use multiple luns on a path, we were using multiple SAN storage disks over this fiber through the same fiber of an EMC array so we had at least five differents luns from the same host/target.

Stuart > Same response than Paulo, but thank you for the link who is really interesting