I configured RAID on our server and I installed Ubuntu 16.04. I want to know if I successfully use the RAID setup . How do I check this on our server ?

This is result of lsblk

Name Maj:min RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk | |--sda1 8:1 0 465.9G 0 part/ |--sda2 8:2 0 1k 0 part/ |--sda5 8:5 0 3.9G 0 part/[swap] sdb 8:16 0 465.8G 0 disk sdc 8:32 0 465.8G 0 disk sdd 8:48 0 465.8G 0 disk

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2 Answers

To check Software RAID status, run following command:

sudo cat /proc/mdstat

It will provide you out with three possible values as follows:

root@tmp:~$ cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb2[1]
116414912 blocks [2/1] [_U]
md0 : active raid1 sda1[0] sdb1[1]
803136 blocks [2/2] [UU]
unused devices: <none>

Personalities on this machine are "raid1" which means this machine is set-up to use raid devices configured in a raid1 configuration.

Here,

[UU] indicates a healthy RAID partition.

[_U] or

[U_] indicates a failed partition. You can read more on this at Installation/SoftwareRAID

To check Hardware RAID status,

sudo aptitude install mpt-status
sudo modprobe mptctl --Load the *mptctl* kernel module
sudo mpt-status -p --Find the SCSI ID for your disk array

To get RAID status report:

sudo mpt-status -i 2 --“2” is the SCSI ID from above step

1

Well it's relatively simple, let's say you have 10TB storage if you configured one volume in raid 10 you would have around 5TB left. When you come to install Ubuntu you should see the volume you created with 5TB available to use.

3

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