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Operating Systems Linux Red Hat device-mapper-multipath path [undef] Post 302337214 by manzier on Thursday 23rd of July 2009 04:02:38 PM
Old 07-23-2009
device-mapper-multipath path [undef]

I have an HP blade with Qlogic HBA's connected to an EVA8000. I have downloaded the latest multipath.conf from HP's website. The drive presented to the server appears to be configured and working except the output of "multipath -l" shows [undef] for all paths. What is causing this output?

mpath0 (3600508b400105ce40001800004210000) dm-4 HP,HSV210
[size=100G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
\_ 0:0:0:1 sda 8:0 [active][undef]
\_ 0:0:1:1 sdb 8:16 [active][undef]
\_ 1:0:0:1 sde 8:64 [active][undef]
\_ 1:0:1:1 sdf 8:80 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:2:1 sdc 8:32 [active][undef]
\_ 0:0:3:1 sdd 8:48 [active][undef]
\_ 1:0:2:1 sdg 8:96 [active][undef]
\_ 1:0:3:1 sdh 8:112 [active][undef]
 

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KPARTX(8)						   Linux Administrator's Manual 						 KPARTX(8)

NAME
kpartx - Create device maps from partition tables SYNOPSIS
kpartx [-a | -d | -l] [-v] wholedisk DESCRIPTION
This tool, derived from util-linux' partx, reads partition tables on specified device and create device maps over partitions segments detected. It is called from hotplug upon device maps creation and deletion. OPTIONS
-a Add partition mappings -r Readonly partition mappings -r Read-only partition mappings -d Delete partition mappings -u Update partition mappings -l List partition mappings that would be added -a -p set device name-partition number delimiter -f force creation of mappings; overrides 'no_partitions' feature -g force GUID partition table (GPT) -v Operate verbosely -s Sync mode. Don't return until the partitions are created EXAMPLE
To mount all the partitions in a raw disk image: kpartx -av disk.img This will output lines such as: loop3p1 : 0 20964762 /dev/loop3 63 The loop3p1 is the name of a device file under /dev/mapper which you can use to access the partition, for example to fsck it: fsck /dev/mapper/loop3p1 When you're done, you need to remove the devices: kpartx -d disk.img SEE ALSO
multipath(8) multipathd(8) hotplug(8) AUTHORS
This man page was assembled By Patrick Caulfield for the Debian project. From documentation provided by the multipath author Christophe Varoqui, <christophe.varoqui@opensvc.com> and others. July 2006 KPARTX(8)
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