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I have a serious problem with a SAN storage array connected to a Linux box through Fibre Channel. Here is the configuration :

  • Debian with plain vanilla linux
  • Fibre controller QLogic 4Gb dual port ( ISP2432 based)

Basically the problem is: how to get this #?@!! FC controller/driver to recognize properly configuration changes (new or removed LUNs) of the storage array?

  1. when I create a new LUN on my array (typically a snapshot of some existing LUN) and map it to my HBA, I can't get it recognized properly : rescan-scsi-bus -l -w -r actually detects something ( a generic /dev/sgXX device) however no block device is created ( /dev/sdXX).
  2. same thing when issuing a LIP and rescan manually:

    echo 1 > /sys/class/fc_host/host6/issue_lip

    echo "- - -" > /sys/class/scsi_host/host6/scan

  3. if I remove an existing LUN, neither issuing LIPs and rescans or rescan-scsi-bus have any effect. The previous devices remain there and of course don't work ( "file -s /dev/sdXX -> I/O error").

  4. reloading the qla2xxx driver works. However it's completely unworkable in a production environment.

Apparently this is a very common problem with QLogic. Some sort of solution exists that works only when using the QLogic issued driver available only for RedHat and Suse enterprise distros : see this explanation.

Additional info :

Here is the scsi devices before LIP and rescan:

# sg_map -x
/dev/sg0  0 0 0 0  0  /dev/sda
/dev/sg1  0 0 1 0  5  /dev/scd0
/dev/sg2  1 0 0 0  0  /dev/sdb
/dev/sg3  6 0 0 0  0  /dev/sdc
/dev/sg4  6 0 0 1  0  /dev/sdd
/dev/sg5  6 0 0 2  3

After a LIP and rescan, I have a new sg device, but no matching drive. If I reload the driver, a drive appear:

# sg_map -x
/dev/sg0  0 0 0 0  0  /dev/sda
/dev/sg1  0 0 1 0  5  /dev/scd0
/dev/sg2  1 0 0 0  0  /dev/sdb
/dev/sg3  6 0 0 0  0  /dev/sdc
/dev/sg4  6 0 0 1  0  /dev/sdd
/dev/sg5  6 0 0 2  3
/dev/sg6  6 0 0 3  3

~# sg_map -x
/dev/sg0  0 0 0 0  0  /dev/sda
/dev/sg1  0 0 1 0  5  /dev/scd0
/dev/sg2  1 0 0 0  0  /dev/sdb
/dev/sg3  8 0 0 0  0  /dev/sdc
/dev/sg4  8 0 0 1  0  /dev/sdd
/dev/sg5  8 0 0 2  0  /dev/sde
/dev/sg6  8 0 0 3  3

Edit: OK, obviously this is a tough nut to crack. I'll ask the LKML and report here.

share|improve this question
That QLogic issued driver you're talking about can be compiled for other distros too -- it isn't a binary blob. – Captain Segfault Aug 14 '09 at 17:15
Fine, where can I find it then? I compiled the whole kernel, one more driver isn't a problem at all. – wazoox Aug 14 '09 at 20:08
I'm having this problem, did you manage to find out anything? – ThatGraemeGuy Jun 13 '12 at 11:21
Sorry, no info yet. – wazoox Jun 15 '12 at 15:30

In the off chance that the block device is being detected, but no /dev/ device is being created, you can manually create the device. This isn't optimal, but might limp you along. The major and minor numbers are presented in /proc/partitions, and you can create your own block devices through the mknod command.

 # mknod /dev/sdg4 104 17

However, I feel your pain. QLogic offers driver download for RHEL and SUSE but it seems no other distros. OpenSUSE just might have the QLogic-branded drivers but I can't be certain of it. I'll check closer when I get to work.

Edit: I'm at work, and it does seem that the QLogic drivers on my SLES boxes are all the QLogic supplied one. Their OS support grid:

And yet, when I download the bog-standard kernel and look in the ./drivers/scsi/qla2xxx/qla_version.h file it is nearly the same version numbers as I have on my Novell distros (both SLES, and the free openSUSE). Which suggests that the solution you found for SLES/RHEL may actually work with a standard kernel.

share|improve this answer
Unfortunately it can't work, because it mention using a file that is non existent ( /proc/scsi/qla2xxx/...) and a command (scsi-qlascan) that doesn't appear in the driver source code. – wazoox Aug 14 '09 at 20:11

Hey Wazoox I was faceing same pro with my SAN box i have google and some tips which follow if can try i think it will start working 1 there is one tools call emcgrab tools u can run this tool to find out the driver of your qlogic driver is working or not.

which san box r u using?

there are some tips as follow..

share|improve this answer
Yes, lots of tips on google but most if not all of them are about RedHat/SuSe and the Qlogic proprietary driver... However one of your links gave me an idea, I'll be back :) – wazoox Aug 14 '09 at 20:15
Well, uh, I tried with the latest firmware, but no luck... – wazoox Aug 14 '09 at 20:59

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