topic Re: pvdisplay -l /dev/disk/disk* not working properly in Operating System - HP-UX

pvdisplay -l /dev/disk/disk* not working properly

UniRock — Fri, 28 May 2010 03:04:14 GMT

Hi All,

# pvdisplay -l /dev/disk/disk*
pvdisplay: Couldn't open physical volume "/dev/disk/disk60": <<<<<<<< DVD

# pvdisplay -l /dev/disk/disk63_p2 <<<<< Works fine
/dev/disk/disk63_p2:LVM_Disk=yes

# strings /etc/lvmtab
/dev/vg00
/dev/disk/disk63_p2

# ll /dev/disk/disk*
brw-r----- 1 bin sys 3 0x000000 May 26 21:31 /dev/disk/disk60
brw-r----- 1 bin sys 3 0x000001 May 26 21:31 /dev/disk/disk61
brw-r----- 1 bin sys 3 0x000002 May 26 21:31 /dev/disk/disk62
brw-r----- 1 bin sys 3 0x000003 May 26 21:31 /dev/disk/disk63
brw-r----- 1 bin sys 3 0x00000c May 26 21:31 /dev/disk/disk63_p1
brw-r----- 1 bin sys 3 0x00000d May 26 21:31 /dev/disk/disk63_p2
brw-r----- 1 bin sys 3 0x00000e May 26 21:31 /dev/disk/disk63_p3
brw-r----- 1 bin sys 3 0x000005 May 26 21:31 /dev/disk/disk64
brw-r----- 1 bin sys 3 0x000006 May 26 21:31 /dev/disk/disk65
brw-r----- 1 bin sys 3 0x000007 May 26 21:31 /dev/disk/disk66
brw-r----- 1 bin sys 3 0x000008 May 26 21:31 /dev/disk/disk67
brw-r----- 1 bin sys 3 0x000009 May 26 21:31 /dev/disk/disk68
brw-r----- 1 bin sys 3 0x00000a May 26 21:31 /dev/disk/disk69
brw-r----- 1 bin sys 3 0x00000b May 26 21:31 /dev/disk/disk70

# vgdisplay -v | grep "PV Name"
PV Name /dev/disk/disk63_p2

Question is why "pvdisplay -l /dev/disk/disk*" is NOT working for all disks.

Note: This is a fresh system

Thanks..

Re: pvdisplay -l /dev/disk/disk* not working properly

Suraj K Sankari — Fri, 28 May 2010 03:46:50 GMT

Hi,

Please post "ioscan -fnC disk"

Suraj

Re: pvdisplay -l /dev/disk/disk* not working properly

UniRock — Fri, 28 May 2010 04:10:14 GMT

Attached "ioscan -fnC disk"

Re: pvdisplay -l /dev/disk/disk* not working properly

Torsten. — Fri, 28 May 2010 04:23:16 GMT

I would not expect to see this working with a DVD, even if a disk is loaded.

Re: pvdisplay -l /dev/disk/disk* not working properly

UniRock — Fri, 28 May 2010 04:31:50 GMT

>> I would not expect to see this working with a DVD, even if a disk is loaded.
Right, neither did I :-)

If "pvdisplay -l " is run individually on disks, it runs fine.
But the question is why is it NOT working for rest of the disks. It only reports error for DVD (disk60).

Re: pvdisplay -l /dev/disk/disk* not working properly

singh sanjeev — Fri, 28 May 2010 04:35:28 GMT

may diskinf work on the DVD device file :

diskinfo /dev/rdisk/disk60

to make it work try to execute via a script :

cat >dskfile
#entry device file entry like
/dev/disk/disk60

then

for i in `cat dskfile`
do
pvdisplay -l $i
done

this will let you know the desire output..

Re: pvdisplay -l /dev/disk/disk* not working properly

Torsten. — Fri, 28 May 2010 04:36:35 GMT

I never tried this, but I think if no disk is loaded, the open fails already, hence the error on open.

Re: pvdisplay -l /dev/disk/disk* not working properly

UniRock — Fri, 28 May 2010 04:56:45 GMT

@ Sanjeev
Thanks for the script. But, I know that the command is working fine when run for individual disk (hence works with script as well).

I was going through some doc which says that in 11.31 we can find disks that are NOT used by lvm by this command (with output):
# pvdisplay -l /dev/disk/disk*
/dev/disk/disk36:LVM_Disk=no
/dev/disk/disk36_p1:LVM_Disk=no
/dev/disk/disk36_p2:LVM_Disk=yes
/dev/disk/disk36_p3:LVM_Disk=no
/dev/disk/disk37:LVM_Disk=no
/dev/disk/disk38:LVM_Disk=no

But in my server above command is not working for disks.

So, wanted to divert your attention toward disks..I am hardly concerned about DVD's output.

Re: pvdisplay -l /dev/disk/disk* not working properly

TTr — Fri, 28 May 2010 11:11:56 GMT

Based on your ioscan output try

pvdisplay -l /dev/dsk/c9*
pvdisplay -l /dev/dsk/c9t0d?

I tried on hp-ux 11.11 "pvdisplay /dev/dsk/*" and it also exited after erroring out on the DVD drive.

But then I narrowed it down to "pvdisplay /dev/dsk/c2*" (the DVD drive is c0t0d0) and it showed all disks in the c2 path.

Apparently there may be something wrong with the error handling of the pvdisplay command.

Re: pvdisplay -l /dev/disk/disk* not working properly

Benoy Daniel — Sat, 29 May 2010 00:18:37 GMT

pvdisplay will work only if the disk is part of any VG.

Re: pvdisplay -l /dev/disk/disk* not working properly

Bill Hassell — Sat, 29 May 2010 00:40:53 GMT

pvdisplay is not a hardware command like diskinfo. It is part of the LVM collection and is designed to look for LVM header information on disks. A CD or DVD is not a disk at all. It may be treated as such at a high level but the tracks on the CD/DVD have nothing to do with LVM, nor are the driver interfaces the same as a disk. pvdisplay employs some lower level driver code to look at the tracks -- CD/DVD players don't respond in the same way.

If you want to look at every device file in /dev/disk, you'll first have to verify that the device file points to a working disk. Then use dd to read address 2000 and look for LVMREC. Once you have an LVM disk (whether recorded in lvmtab or not), you can then use pvdisplay.