How to find out which filesystems belongs to which disk or I/O controller

[ezhilarasan_1]

Hi,

How to find out which filesystems belongs to which disk or I/O controller
This info will be useful to distribute I/O load evenly by scattering the datafiles
among filesystems.


Thanks
Ezhil

[Onur Karakan]

hi ezhilarasan,

I think the following command will be userful for you.

lvdisplay -v |more

Best Regards,

Onur

--- Logical volumes ---
LV Name /dev/vg01/lvorasoft
VG Name /dev/vg01
.........................

--- Distribution of logical volume ---
PV Name LE on PV PE on PV
/dev/dsk/c0t3d0 813 813

--- Logical extents ---
LE PV1 PE1 Status 1
00000 /dev/dsk/c0t3d0 00000 current
00001 /dev/dsk/c0t3d0 00001 current
00002 /dev/dsk/c0t3d0 00002 current
00003 /dev/dsk/c0t3d0 00003 current
00004 /dev/dsk/c0t3d0 00004 current
..............................
..............................

[RAC_1]

lvdisplay will tell you the about which FS is on which disk.
For i/o controller information, you need to give us more infomration. It depends on what type of SAN/NAS you use. You will have to relate the disks to controller and in turn relate those lvols to controllers. Check primary and alternate paths for lvols.

[Rajeev Shukla]

with the bdf get the logical volume corresponding to the filesystem you are looking and then lvdisplay on that logical volume with -v option will give you the disk on which that LV is spread. Now you can then do a ioscan -fn and get the disk and controllers in the system and try to map the controller on which that disk resides.
You could also do a pvdisplay on each disk to see what LV are created on those disks (this is the backward method to go)

[Frank de Vries]

Hi Ezhil

I usually do it the other way around.
I mean, I do a vgdisplay first to get the
disks in the volumegroup.

Then I use pvdisplay -v /dev/dsk/cxtxdx |more
to get the list of logical volumes on that disk:
--- Distribution of physical volume ---
LV Name LE of LV PE for LV
/dev/vg00/lvol1 11 11
/dev/vg00/lvol2 128 128
/dev/vg00/lvol3 18 18
/dev/vg00/lvol4 38 38
/dev/vg00/lvol5 3 3
/dev/vg00/lvol6 175 175
/dev/vg00/lvol7 150 150
/dev/vg00/lvol8 200 200
/dev/vg00/lvol9 1000 1000
/dev/vg00/lvorasys 938 938
/dev/vg00/temp 250 250
-
This way you can see if there are more things
going on like mirrorring, striping etc..
The patterns is clearer

[Ninad_1]

Hi,

Try this script

for i in `vgdisplay | grep 'VG Name' | awk '{print $NF}'`
do
for j in `vgdisplay -v $i | grep 'LV Name' | awk '{print $NF}'`
do
echo "$j \c"
lvdisplay -v $j | awk '/Distribution/,/Logical extents/ {print $1}' | grep '/dev/dsk' | cut -f 4 -d "/" | awk 'ORS=" ";{print $0}'
echo "\r"
done
done


This will give you which disks are used by each logical volume. You can develop on this script to get what you want.

Regards,
Ninad

[Raj D.]

Hi ezhilarasan ,

1. Do a bdf and check the lvols that refering to to that Filesystem.

Then use lvdisplay -v lvname to check the disk belongs to.

# echo "lvolname \c" ; lvdisplay -v lvolname | grep -v current | grep dsk | awk '{print $1}'

2. Do a ioscan -fnC disk , to check which controller that disk belongs to.


Cheers,
Raj.

[ezhilarasan_1]

Hi Unix experts,

Thanks for your knowledge update in this topic.

I need this also for Sun Solaris and Linux.

Please help. thanks a lot.

Regards
Ezhil

[Prasad Joshi]

The script given by Ninad is very good.

But the only thing is it will display each device twice, as the rule is matched twice.

Replace this command

lvdisplay -v $j | awk '/Distribution/,/Logical extents/ {print $1}' | grep '/dev/dsk' | cut -f 4 -d "/" | awk 'ORS=" ";{print $0}'

with

lvdisplay -v $j | awk '/Distribution/,/Logical extents/ {print $1}' | grep '/dev/dsk' | cut -f 4 -d "/" | awk 'BEGIN { ORS=" "} ; {print $0}'

[ezhilarasan_1]

Hi Unix gurus,

Thanks once again.

Please see my previous update.

Also I need this for Sun Solaris and Linux.

Please help with commands for these Unix.

Regards
Ezhil