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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LEARN ABOUT DEBIAN
kpartx
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)