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Multi_path_Usage_Guide.txt
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http://www.sourceware.org/lvm2/wiki/MultipathUsageGuide
Standard output of multipath command:
# multipath -ll
mydev1 (3600a0b800011a1ee0000040646828cc5) dm-1 IBM,1815 FAStT
[size=512M][features=1 queue_if_no_path][hwhandler=1 rdac]
\_ round-robin 0 [prio=6][active]
\_ 29:0:0:1 sdf 8:80 [active][ready]
\_ 28:0:1:1 sdl 8:176 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 28:0:0:1 sdb 8:16 [active][ghost]
\_ 29:0:1:1 sdq 65:0 [active][ghost]
Annotated output of multipath command:
mydev1 (3600a0b800011a1ee0000040646828cc5) dm-1 IBM,1815 FAStT
------ --------------------------------- ---- --- ---------------
| | | | |-------> Product
| | | |------------------> Vendor
| | |-----------------------> sysfs name
| |-------------------------------------------------> WWID of the device
|------------------------------------------------------ ----------> User defined Alias name
[size=512M][features=1 queue_if_no_path][hwhandler=1 rdac]
--------- --------------------------- ----------------
| | |--------------------> Hardware Handler, if any
| |---------------------------------------------> Features supported
|---------------------------------------------------------------> Size of the DM device
Path Group 1:
\_ round-robin 0 [prio=6][active]
-- ------------- ------ ------
| | | |----------------------------------------> Path group state
| | |-----------------------------------------------> Path group priority
| |--------------------------------------------------------------> Path selector and repeat count
|-------------------------------------------------------------------> Path group level
First path on Path Group 1:
\_ 29:0:0:1 sdf 8:80 [active][ready]
-------- --- ---- ------ -----
| | | | |---------------------------------> Physical Path state
| | | |----------------------------------------> DM Path state
| | |-------------------------------------------------> Major, minor numbers
| |-------------------------------------------------------> Linux device name
|--------------------------------------------------------------> SCSI information: host, channel, scsi_id and lun
Second path on Path Group 1:
\_ 28:0:1:1 sdl 8:176 [active][ready]
Path Group 2:
\_ round-robin 0 [prio=0][enabled]
\_ 28:0:0:1 sdb 8:16 [active][ghost]
\_ 29:0:1:1 sdq 65:0 [active][ghost]