Dell POWERVAULT MD3620I Manuel d'utilisateur télécharger pdf (Page 142)

142 Configuration: Disk Groups and Virtual Disks

[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

Flush 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.

Delete 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

Remove mapping from MDSM, or delete the LUN if necessary.

If 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.

If a new LUN is mapped or volume capacity is changed, run the following

command:

# rescan_dm_devs

Use the

multipath -ll

command to verify that:

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Dell POWERVAULT MD3620I Manuel d'utilisateur Page 142