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How to convert controller disk naming to SSD on Solaris ?

Have you ever been analysed the SAR(System activity reporter) reports on Solaris server for the disk performance issues  ?  If you would have done that , you might noticed that all the disks & LUN’s will be shown as “ssdXXX” names instead of  cXtXdXs2. If you run “iostat” command without “n” option,  you can see that LUNS/Disks will be displaying with sdd names.  In this article ,we will see that how to map the controller wise disk names to ssd names on oracle Solaris operating system.

Let’s see that how to map the controller wise disk names to SSD names manually.

1. List the disk device file from the device tree.

root@UA-GBL:~# ls -lrt /dev/rdsk/c0t60060E80166D5F9800016D5F000000B3d0s2
lrwxrwxrwx   1 root     root          67 Sep 25  2014 /dev/rdsk/c0t60060E80166D5F9800016D5F000000B3d0s2 -> ../../devices/scsi_vhci/ssd@g60060e80166d5f0008716d5f000000b3:c,raw

Here we just need the unique id of the disk . (which start after “@” and ends before “:” ) . Let me use some filters to trim the above output.

root@UA-GBL:~# ls -lrt /dev/rdsk/c0t60060E80166D5F9800016D5F000000B3d0s2 |awk ' { print $11 }' |cut -d "@" -f2 |cut -d ":" -f1

2. Use the “grep” function to find the sdd number from the /etc/path_to_inst file.

root@UA-GBL:~# grep g60060e80166d5f0008716d5f000000b3 /etc/path_to_inst
"/scsi_vhci/ssd@g60060e80166d5f0008716d5f000000b3" 285 "ssd"

If you just would like to know the ssd number for the disk , use awk command to filter it .

root@UA-GBL:~# grep g60060e80166d5f0008716d5f000000b3 /etc/path_to_inst |awk ' { print $2 } '

From the above analysis , we have found that LUN “c0t60060E80166D5F9800016D5F000000B3d0s2” SSD number is 285. The same way you can map for the all the LUNS.

Let’s see how we can map all the disks/LUN’s SSD number using below script.


echo "==============================="
echo "= UnixArena - LUN Name to SSD ="
echo "==============================="
/usr/bin/iostat -E | grep Soft | awk '{ print $1}' > /tmp/a; iostat -En | grep Soft|awk '{ print $1 }' > /tmp/b; paste /tmp/a /tmp/b
/usr/bin/rm /tmp/a /tmp/b
echo "==========="
echo "Thank you"
echo "==========="

1. Copy the above mentioned script as “lun_to_ssd.sh” and make it as executable.

# chmod +x lun_to_ssd.sh

2. Execute the script like below. Hope you will like the script output.

root@UA-GBL:/export/home/UnixArena# ./lun_to_ssd.sh
= UnixArena - LUN Name to SSD =

sd0     c3t5000CCA01637C7ADd0
sd1     c9t5000CCA01637C795d0
sd5     c2t0d0
ssd97   c0t60060E80177D5F0000016D5F00000063d0
ssd98   c0t60060E80177D5F0000016D5F00000062d0
ssd99   c0t60060E80177D5F0000016D5F00000061d0
ssd100  c0t60060E80177D5F0000016D5F00000060d0
ssd101  c0t60060E80177D5F0000016D5F0000005Fd0
ssd102  c0t60060E80177D5F0000016D5F0000005Ed0
ssd103  c0t60060E80177D5F0000016D5F0000005Dd0
ssd104  c0t60060E80177D5F0000016D5F0000005Cd0
ssd105  c0t60060E80177D5F0000016D5F0000005Bd0
ssd106  c0t60060E80177D5F0000016D5F0000005Ad0
ssd107  c0t60060E80177D5F0000016D5F00000065d0
ssd108  c0t60060E80177D5F0000016D5F00000038d0
ssd109  c0t60060E80177D5F0000016D5F00000037d0
ssd110  c0t60060E80177D5F0000016D5F00000036d0
ssd111  c0t60060E80177D5F0000016D5F00000035d0
ssd112  c0t60060E80177D5F0000016D5F00000034d0
ssd113  c0t60060E80177D5F0000016D5F00000033d0
ssd114  c0t60060E80177D5F0000016D5F00000032d0
ssd115  c0t60060E80177D5F0000016D5F00000031d0

Thank you

The above script will shows only for the DISK/LUN’s which are shown in format command. If you would like to know the ssd number for multi-paths , use the below perl script which i found in internet.

#!/usr/bin/env perl
use strict;

my @path_to_inst = qx#cat /etc/path_to_inst#;
map {s/"//g} @path_to_inst;
my ($device, $path, @instances);

for my $line (qx#ls -l /dev/dsk/*s2#) {
    ($device, $path) = (split(/\s+/, $line))[-3, -1];
    $path =~ s#.*/devices(.*):c#$1#;

    @instances =
        map {join("", (split /\s+/)[-1, -2])}
            grep {/$path/} @path_to_inst;
#*emphasized text*
    for my $instance (@instances) {
        print "$device $instance\n";

1. Copy the above script as “lun_to_ssd_perl.sh” and make it executable.

2. Execute the script. You will get the output like below.

root@UA-GBL:/export/home/lrangasa# ./lun_to_ssd_perl.sh
/dev/dsk/c0t5000CCA01637C794d0s2 sd6
/dev/dsk/c0t5000CCA01637C7ACd0s2 sd4
/dev/dsk/c0t60060E80166D5F0008716D5F00000019d0s2 ssd139
/dev/dsk/c0t60060E80166D5F0000016D5F0000001Ad0s2 ssd138
/dev/dsk/c0t60060E80166D5F0000016D5F0000001Bd0s2 ssd137
/dev/dsk/c0t60060E80166D5F0000016D5F0000001Cd0s2 ssd136
/dev/dsk/c0t60060E80166D5F0000016D5F0000001Dd0s2 ssd135
/dev/dsk/c0t60060E80166D5F0000016D5F000002DEd0s2 ssd331
/dev/dsk/c0t60060E80166D5F0000016D5F000002DFd0s2 ssd330
/dev/dsk/c2t0d0s2 sd5
/dev/dsk/c3t5000CCA01637C7ADd0s2 sd0
/dev/dsk/c5t50060E80166D5F56d79s2 ssd154
/dev/dsk/c5t50060E80166D5F56d7s2 ssd24
/dev/dsk/c5t50060E80166D5F56d80s2 ssd153
/dev/dsk/c5t50060E80166D5F56d81s2 ssd152
/dev/dsk/c5t50060E80166D5F56d82s2 ssd151
/dev/dsk/c5t50060E80166D5F56d96s2 ssd243
/dev/dsk/c5t50060E80166D5F56d97s2 ssd242
/dev/dsk/c5t50060E80166D5F56d98s2 ssd241
/dev/dsk/c5t50060E80166D5F56d99s2 ssd240
/dev/dsk/c5t50060E80166D5F56d9s2 ssd22
/dev/dsk/c7t50060E80166D5F46d0s2 ssd63
/dev/dsk/c7t50060E80166D5F46d100s2 ssd253
/dev/dsk/c7t50060E80166D5F46d101s2 ssd252
/dev/dsk/c7t50060E80166D5F46d102s2 ssd251
/dev/dsk/c7t50060E80166D5F46d103s2 ssd250
/dev/dsk/c7t50060E80166D5F46d104s2 ssd249
/dev/dsk/c7t50060E80166D5F46d105s2 ssd248
/dev/dsk/c7t50060E80166D5F46d106s2 ssd247
/dev/dsk/c7t50060E80166D5F46d107s2 ssd246
/dev/dsk/c7t50060E80166D5F46d10s2 ssd53
/dev/dsk/c7t50060E80166D5F46d11s2 ssd52
/dev/dsk/c7t50060E80166D5F46d94s2 ssd259
/dev/dsk/c7t50060E80166D5F46d95s2 ssd258
/dev/dsk/c7t50060E80166D5F46d96s2 ssd257
/dev/dsk/c7t50060E80166D5F46d97s2 ssd256
/dev/dsk/c7t50060E80166D5F46d98s2 ssd255
/dev/dsk/c7t50060E80166D5F46d99s2 ssd254
/dev/dsk/c7t50060E80166D5F46d9s2 ssd54
/dev/dsk/c9t5000CCA01637C795d0s2 sd1

The above output matches the each device file with it’s sdd names.  If you have multiple paths to the LUN’s, the above script can provide the ssd numbers for each path with associated disks.

Hope this article is informative to you .


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