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How to Manually Refresh Multipath Write Protection Status from "wp=ro" to "wp=rw" (Doc ID 2660512.1)

Last updated on APRIL 23, 2020

Applies to:

Linux OS - Version Oracle Linux 6.0 and later
Linux x86-64


Normally multipath will refersh the write protection status automatically.

In some rare cases when multipath is reporting write protection as "wp=ro" for some certain dm-mp devices, we could do a manual refresh without a reboot.

Most times, the device is actually writable even if it shows as "wp=ro".

For example:

# multipath -l 
360000000000000000000000000000001 dm-16 EMC,SYMMETRIX
size=200G features='1 queue_if_no_path' hwhandler='0' wp=ro  <<=== write protection shows as "wp=ro" for this disk
`-+- policy='round-robin 0' prio=0 status=active
  |- 0:0:0:8 sde 16:111 active undef unknown
  `- 2:0:0:8 sdf 17:222 active undef unknown


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