Red Hat ENTERPRISE LINUX 4 - DM MULTIPATH Guía de usuario descargar pdf (Pagina 18)

# multipath -ll

mpath19 (360001ff0721160000000002688e10002) dm-2 DDN,S2A 6620

[size=21T][features=1 queue_if_no_path][hwhandler=0][rw]

\_ round-robin 0 [prio=50][active]

\_ 1:0:0:2 sdg 8:96 [active][ready]

\_ round-robin 0 [prio=10][enabled]

\_ 2:0:0:2 sdf 8:80 [active][ready]

Path Group 2

\_ round-robin 0 [prio=10][enabled]

\_ 2:0:0:2 sdf 8:80 [active][ready]

The example above shows a second path group to the same device (referenced in Path Group

1) within the Priority Group. This path group has a lower priority (prio=10) than path group 1

(prio=50). The path group state of this path group is “enabled”, meaning it is ready to service

IO, but is not the optimal path to send IO requests through. The physical path state is “ready”

to accept IO requests and the device mapper path state is “active”, which infers the path was

last tested successfully.

8. S2A 6620 EXAMPLE

The figure below identifies the relationships between linux SCSI devices, S2A 6620 virtual disks,

presentations, and dm-multipath devices.

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Red Hat ENTERPRISE LINUX 4 - DM MULTIPATH Guía de usuario Pagina 18