Getting disk size info from iostat in Solaris/Using lsblk to find total size of disks allocated in Linux

I know the title of the post is long. With that out of the way lets get started.

Today I'll share a quick one liner to provide the size of attached disks in a neat format with iostat command in Solaris.

So, here's what the iostat -En command output looks like :

[ssuri@:~] $ sudo iostat -En
c21d0            Soft Errors: 0 Transport Errors: 0 Protocol Errors: 0
Vendor: SUN Product: VDSK Size: 137.67GB <137665445888 bytes>

c21d1            Soft Errors: 0 Transport Errors: 0 Protocol Errors: 0
Vendor: SUN Product: VDSK Size: 137.67GB <137665445888 bytes>

And this is the one liner to format it so that we get a two column output consisting of the disk name and disk size only.

sudo iostat -En | awk '{print $1, $6}' | tr -d "Errors:" | sed 's/Vend//g' | sed '$!N;$!N;s/\n/ /g'

Given below is the output of the above one liner:

c21d0   137.67GB

c21d1   137.67GB

c21d2   274.88GB

c21d11   34.36GB

c21d12   34.36GB

c21d13   34.36GB

c21d14   34.36GB

c21d15   34.36GB

c21d16   34.36GB

c21d17   34.36GB

c21d18   68.72GB

c21d19   274.88GB


Now coming to the Linux part.
I was recently tasked with getting information on total connected SAN storage excluding the root & swap disks for some Linux servers.
I could've used fdisk but I used lsblk instead.


Here is the default output of lsblk without any filters:

[ssuri@:~] $ lsblk
NAME                        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0                          11:0    1 1024M  0 rom
sdb                           8:16   0   32G  0 disk
`-grid_vg-grid_lv (dm-4)    253:4    0   32G  0 lvm  /grid
sdc                           8:32   0   24G  0 disk
`-kdump_vg-kdump_lv (dm-3)  253:3    0   24G  0 lvm
sdd                           8:48   0   32G  0 disk
`-elmerd5db_vg-lvol1 (dm-2) 253:2    0   32G  0 lvm  /elmerd5db/db
sde                           8:64   0   32G  0 disk
`-sde1                        8:65   0   32G  0 part
sdf                           8:80   0  256G  0 disk
`-sdf1                        8:81   0  256G  0 part
sdg                           8:96   0   32G  0 disk
`-sdg1                        8:97   0   32G  0 part
sda                           8:0    0   60G  0 disk
|-sda1                        8:1    0  512M  0 part /boot
`-sda2                        8:2    0 59.5G  0 part
  |-os_vg-root_lv (dm-0)    253:0    0   16G  0 lvm  /
  |-os_vg-swap_01_lv (dm-1) 253:1    0    4G  0 lvm  [SWAP]
  |-os_vg-tmp_lv (dm-5)     253:5    0    2G  0 lvm  /tmp
  |-os_vg-var_lv (dm-6)     253:6    0   10G  0 lvm  /var
  `-os_vg-hpds_lv (dm-7)    253:7    0   12G  0 lvm  /var/opt/perf/datafiles
sdi                           8:128  0   32G  0 disk
`-sdi1                        8:129  0   32G  0 part
sdh                           8:112  0   32G  0 disk

`-sdh1                        8:113  0   32G  0 part

I know that I'm using disk sda and sdc for root and swap space respectively.

So lets limit the output to disk devices and filter out disks /dev/sda and /dev/sdc.

[ssuri@:~] $ lsblk | egrep disk  | grep -v "sd[ac]"

sdb                           8:16   0   32G  0 disk

sdd                           8:48   0   32G  0 disk

sde                           8:64   0   32G  0 disk

sdf                           8:80   0  256G  0 disk

sdg                           8:96   0   32G  0 disk

sdi                           8:128  0   32G  0 disk

sdh                           8:112  0   32G  0 disk

Now, I'll use awk to calculate the total size of these disks:

[ssuri@:~] $ lsblk | egrep disk  | grep -v "sd[ac]" | tr -d "G" | awk '{sum+=$4} END {print sum}'

448

A quick and easy time saver.