Getting this oddity when I try to add mpath0 as a physical volume:

[server][~]$ pvcreate /dev/mapper/mpath0
Can't open /dev/mapper/mpath0 exclusively. Mounted filesystem?



Here are some details:

[server][~]$ pvdisplay
--- Physical volume ---
PV Name /dev/cciss/c0d0p2
VG Name vg0
PV Size 819.91 GB / not usable 524.00 KB
Allocatable yes
PE Size (KByte) 32768
Total PE 26237
Free PE 189
Allocated PE 26048
PV UUID wXCE2M-vvmr-5TPH-lrDT-tHDT-ecLJ-EXkm4g



[server][~]$ multipath -ll
mpath0 (3600c0ff0000000000a7e4a7984106400)
[size=1395 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [prio=2][active]
\_ 0:0:0:0 sda 8:0 [active][ready]
\_ 1:0:0:0 sdb 8:16 [active][ready]



[server][~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg0-lvol01
20G 3.4G 16G 18% /
/dev/mapper/vg0-lvol05
690G 101M 654G 1% /app
/dev/cciss/c0d0p1 297M 28M 254M 10% /boot
none 7.9G 0 7.9G 0% /dev/shm
/dev/mapper/vg0-lvol02
40G 1.1G 37G 3% /home
/dev/mapper/vg0-lvol04
9.9G 55M 9.3G 1% /tmp
/dev/mapper/vg0-lvol03
20G 157M 19G 1% /var



Any thoughts?

Please advise,

Harison

what does fdisk -l show you about mpath0?
Is the path in fact /dev/mapper/mpath0 or is just /dev/mpath0 or something else?
For the sake of testing, can you create a primary partition on /dev/mapper/mpath0 using fdisk (take lvm out of the equation)?

User error--should have issued the following command:

pcvreate /dev/mapper/mpath0p1

Thanks