Dell MD3220, MD3200 owner manual 125

Note the virtual disk that you want to delete from the mapping. For example, the following information may be displayed:

mpath6 (3600a0b80000fb6e50000000e487b02f5) dm-10 DELL, MD32xx

[size=1.6T][features=3 queue_if_no_path pg_init_retries 50][hwhandler=1 rdac]

\_ round-robin 0 [prio=6][active]

\_ 1:0:0:2 sdf 8:80 [active][ready] \_ round-robin 0 [prio=1][enabled]

\_ 0:0:0:2 sde 8:64 [active][ghost] In this example, the mpath6 device contains two paths:

--/dev/sdf at Host 1, Channel 0, Target 0, LUN 2 --/dev/sde at Host 0, Channel 0, Target 0, LUN 2

3Flush the multi-pathing device mapping using the following command:

# multipath -f /dev/mapper/mapth_x

where mapth_x is the device you want to delete.

4Delete the paths related with this device using the following command:

# echo 1 > /sys/block/sd_x/device/delete

where sd_x is the SD node (disk device) returned by the multipath command. Repeat this command for all paths related to this device.

For example:

#echo 1 > /sys/block/sdf/device/delete #echo 1 > /sys/block/sde/device/delete

5Remove mapping from c, or delete the LUN if necessary.

6If you want to map another LUN or increase volume capacity, perform this action from MDSM.

NOTE: If you are only testing LUN removal, you can stop at this step.

Configuration: Disk Groups and Virtual Disks

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