Local disks detected as multipath device

Question

My local partitions are detected as multipath device

$multipath -l

mpathb (360014380125d90420000a000003e0000) dm-9 HP,HSV450
size=200G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
`- 3:0:0:1 sdb 8:16 active undef running
mpatha (3600508b1001c02143bc59c6862d97353) dm-0 HP,LOGICAL VOLUME
size=137G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
`- 0:0:0:1 sda 8:0  active undef running

I added the following lines in multipath.conf so that local partitions are not detected as multipath device

blacklist {
   wwid 3600508b1001c02143bc59c6862d97353
}

Executed the following commands after that .

#service multipathd reload

# multipath -F
Oct 22 12:10:42 | mpathb: map in use
Oct 22 12:10:42 | mpatha: map in use

Is reboot of the server will resolve the issue ? It is a production server , so I have to take downtime before going ahead with reboot.

Solution

I resolved the issue . Apart from blacklisting the device in multipath.conf , we had to recompile the RAMDISK so that during booting local disk is blacklisted . Simple excluding the disk and rebooting the server did not helped me to resolve the issue .

Steps are as follows:

Step 1.Blacklist local disk in /etc/multipath.conf by using WWID of the device

blacklist {
wwid 3600508b1001c02143bc59c6862d97353
}

Step 2.Create RAMDISK

1. cp  /boot/initramfs-<>.img /root/

2. mkinitrd -f /boot/initramfs-`uname -r`.img `uname -r`

Step 3. Reboot server and verify using multipath command

$multipath -l 

mpathb (360014380125d90420000a000003e0000) dm-9 HP,HSV450
 size=200G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
`- 3:0:0:1 sdb 8:16 active undef running

More of the issue is detailed here
http://yenonn.blogspot.in/2013/05/linux-dm-multipath-on-local-disk.html

Comments

[user3744406]

Tried rebooting the server by excluding the device by adding a blacklist entry for the device in multipath.conf as shown in original query but no luck . Am I missing anything ?