LUN set offline

On Intel based hosts running the Linux operating system, in response to errors, the kernel might permanently disable a LUN and log a message that states both device set offline and the specific device.

The kernel typically sets a LUN offline to avoid a possible miscompare mechanism. The message is logged in the syslog, which is usually found in the /var/log/messages directory.

If you receive this message, try one of the following actions:
  • Remove the module.
  • Restart the host.

If you decide to remove the module or need more details for setting the LUN online, refer to Multipath Subsystem Device Driver (SDD) documentation for more information.