I have a bare metal server running on Softlayer. It has many Consistent Performance iSCSI storage devices attached in a multipath configuration.
One of the devices, represented by /dev/sdaa1 and /dev/sdab1, is not showing up as a multipath device under /dev/mapper.
How can I make it show up?
Answer
The problem was that the multipath blacklist in /etc/multipath.conf had been amended to exclude /dev/sda1:
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda|sdb|sdc)[0-9]*"
The regex above catches /dev/sda1 as intended, but it also catches /dev/sdaa1 and /dev/sda_foobar. To fix, amend the blacklist to include the end of the device name:
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st|sda|sdb|sdc)[0-9]*$"
After amending the blacklist, reload the configuration:
service multipathd reload
Attribution
Source : Link , Question Author : Leo , Answer Author : Leo
