pvcreate fails while using multipath device
I am trying to use a multpath device (SAN) to create a logical volume using LVM. But the pvcreate fails to initialize the disk
# pvcreate /dev/mapper/mpathb
Device /dev/mapper/mpathb not found (or ignored by filtering).
So then I tried adding a partition and re-attempted to initialize the disk. It still failed.
~~~
# parted /dev/mapper/mpathb print
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/mpathb: 22.0TB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Number Start End Size File system Name Flags
1 2097kB 22.0TB 22.0TB primary lvm
# pvcreate -v /dev/mapper/mpathbp1
Device /dev/mapper/mpathbp1 not found (or ignored by filtering).
Status of mulitpath device:
# multipath -l mpathb
mpathb (36000d31000afae00000000000000000e) dm-2 COMPELNT,Compellent Vol
size=20T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
|- 1:0:0:1 sdc 8:32 active undef running
|- 3:0:0:1 sdb 8:16 active undef running
|- 1:0:3:1 sdh 8:112 active undef running
`- 3:0:3:1 sdi 8:128 active undef running
Any help/advice is appreciated?
Responses
this is because of device exclusion in /etc/lvm/lvm.conf file.. check if you see an entry like this:
filter = [ "r|/dev/mapper|" ]
If so, then either comment out that line or modify it so that any lvm operation would include your multipath devices as well.
What does "ls -l /dev/mapper/mpathb*" show?
Typically the mpath device in /dev/mapper is a symbolic link to a dm-* device. When I had this issue long ago I was able to do pvcreate on the linked dm-* device to solve the issue.
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