Red Hat Bugzilla – Bug 177896
no output from multipath with qla2312 hba
Last modified: 2007-11-30 17:11:21 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050922 Fedora/1.0.7-1.1.fc4 Firefox/1.0.7 Description of problem: multipathing doesn't work at all on my system and I have no glue why: I can't get multipath to show a single line of output - not even the complain when the dm_multipath module is not loaded. kernel: kernel-smp-2.6.14-1.1656_FC4 HBA: qla2312, one Volume assigned in the SAN and present as sdb and sdc on the Host, please see below. Qlogic FC Driver: 8.01.00-k Version-Release number of selected component (if applicable): device-mapper-multipath-0.4.4-2.3 How reproducible: Always Steps to Reproduce: 1. boot system 2. make sure dm_multipath and other dm modules are loaded 3. run multipath -v4 -d 4. or run multipath -v2 -l 5. or run multipath -v10 6. or run multipath -<any other option> Actual Results: nothing happens. Expected Results: multipath should display some sort of status information. I.e. the devices it detected, which ones are blacklisted, ... etc. Depending on the given options. Just anyhing that is more than 'nothing'. ;-) Ideally it should assemble a device named by WWID in /dev/mapper. Additional info: disks are present i.e. in /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: LSILOGIC Model: 1030 IM IM Rev: 1000 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: IBM Model: 1722-600 Rev: 0520 Type: Direct-Access ANSI SCSI revision: 03 Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: IBM Model: 1722-600 Rev: 0520 Type: Direct-Access ANSI SCSI revision: 03 the first device (LSILOGIC) is the internal disk. The two other disks (IBM 1722-600) are one SAN volume seen twice through the two QLA2312 HBAs.
one more thing: I tried with and without the /etc/multipath.conf file. The one I have used was gathered from a RHEL4 System on the very same SAN, where multipath works fine. It's only purpose is actually to blacklist the internal disk (sda): devnode_blacklist { wwid 26353900f02796769 devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*" devnode "^hd[a-z][[0-9]*]" devnode "^cciss!c[0-9]d[0-9]*[p[0-9]*]" # the internal disk devnode "^sda" } multipaths { multipath { wwid 3600a0b800017cc2400001b6d43beb16a alias fc101 } } BTW: why is no default multipath.conf file included in FC4? There should be a rough skeleton file to quickly setup aliases. Or did I miss something here?
ok, I just upgraded to kernel 2.6.15-1.1831_FC4smp (plus all other available FC patches) and tried the same thing again. I still can not get multipath to output anything. I have attached the strace output of 'multipath -v4'. It doesn't tell me much. All I can see is that it seems to exit right after /etc/multipath.conf was read.
Created attachment 124673 [details] strace output of 'multipath -v4'
This problem is fixed in fc5