topic Re: relation between disk device and lvol in Operating System - HP-UX

relation between disk device and lvol

Xavier BLANC — Wed, 20 Oct 2004 05:44:45 GMT

Hello
a sar -d produce something like
12:42:12 device %busy avque r+w/s blks/s avwait avserv
12:42:15 c1t2d0 0,66 0,50 1 11 0,31 12,06
in vgdisplay I have eventualy several lvol for a device.
in the example attached :
is /dev/dsk/c5t10d0 related to : /dev/vg04/lvol1 or /dev/vg04/lvol2

Re: relation between disk device and lvol

Slawomir Gora — Wed, 20 Oct 2004 05:55:26 GMT

Hi,

you have use lvdisplay command to check distribution over disks

ex:

lvdisplay -v /dev/vg04/lvol1

Re: relation between disk device and lvol

Chris Wilshaw — Wed, 20 Oct 2004 05:56:46 GMT

If you use

pvdisplay -v /dev/dsk/c5t10d0

you will get the details of the lvols that are located on that disk.

Re: relation between disk device and lvol

Hein van den Heuvel — Wed, 20 Oct 2004 06:45:57 GMT

You may want to create a little relationship table for dsk -> vg -> lv(s).
For example with the perl scripts below

cat dsk-to-lv

while (<>) {
if (/^VG Name\s+\/dev\/(\w+)/) { $vg=$1; $lv="" }
$lv .= " $1" if (/$vg\/(\w+)/);
printf "%-10s%-10s%s\n",$1,$vg,$lv if (/PV Name .*\/(\w+)$/);
}

vgdisplay -p | perl dsk-to-lv
c0t6d0s2 vg00 lvol1 lvol2 lvol3 lvol4 lvol5 lvol6 lvol7 lvol8 lvol9 lvol0
c73t0d1 vg_nfs lv_nfs
c73t0d2 vg_nfs lv_nfs
c73t0d0 vg_02...
:
:

hth,
Hein.

Re: relation between disk device and lvol

Sยภเl Kย๓คг — Wed, 20 Oct 2004 06:51:26 GMT

I would suggest u to follow the same order
#pvdisplay -v /dev/dsk/c5t10d0 to identify how many lvols are configured on that pv

#lvdisplay -v /dev/vg04/lvol1 to identify the PVs in lvol1
regards
SK

Re: relation between disk device and lvol

Xavier BLANC — Wed, 20 Oct 2004 11:20:43 GMT

Thanks to everybody
I do this script if it can help :
device=$1
pvdisplay -v /dev/dsk/$device | awk ' {
if ( ( NR == 2 ) || ( NR == 3 ) ) { print $0 }
if ( ( NR == 19 ) ) {cmd = "grep "$1" /etc/fstab | cut -d \" \" -f 1,2";lv
= system(cmd) }
}'
Xavier

Re: relation between disk device and lvol

Xavier BLANC — Wed, 20 Oct 2004 11:21:35 GMT

use this script :
device=$1
pvdisplay -v /dev/dsk/$device | awk ' {
if ( ( NR == 2 ) || ( NR == 3 ) ) { print $0 }
if ( ( NR == 19 ) ) {cmd = "grep "$1" /etc/fstab | cut -d \" \" -f 1,2";lv
= system(cmd) }
}'