Dell PowerVault MD3200i - Manual (Page 194)

192 Configuration: Device Mapper Multipath for Linux
Display the multipath device topology using the multipath command
The multipath command adds newly scanned and mapped virtual disks to the
Device Mapper tables and creates entries for them in the /dev/mapper
directory on the host server. These devices are the same as any other block
devices in the host.
To list all the multipath devices, run the following command:
# multipath –ll
The output must be similar to this example, which shows the output for one
mapped virtual disk.
mpath1 (3600a0b80005ab177000017544a8d6b92) dm-0 DELL,
MD32xxi
[size=5.0G][features=3 queue_if_no_path
pg_init_retries 50][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=6][active]
\_ 5:0:0:0 sdc 8:32 [active][ready]
\_ round-robin 0 [prio=1][enabled]
\_ 4:0:0:0 sdb 8:16 [active][ghost]
where:
mpath1
is the name of the virtual device created by device mapper. It is
located in the /dev/mapper directory.
DELL
is the vendor of the device
MD3200i
is the model of the device
Sdc
is the physical path to the owning controller for the device
Sdb
is the physical path to the non-owning controller for the device
The following is an example of SLES output:
mpathb(360080e500017b2f80000c6ca4a1d4ab8) dm-21
DELL,MD32xxi
[size=1.0G][features=3 queue_if_no_path
pg_init_retries 50][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=6][active]
\_ 4:0:0:22 sdx 65:112 [active][ready]
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