4 Drive raid setup – 2 SSD raid 1 for system setup and 2 HDD another raid 1 to /storage
First setup the ssd with raid 1 and comment the 2 hdd.
Then
Add a software RAID array
In our example scenario, the drives /dev/sda
and /dev/sdb
are already combined in multiple RAID1 arrays, which hold the operating system:
cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sda3[2] sdb3[1]
234405504 blocks super 1.2 [2/2] [UU]
bitmap: 0/2 pages [0KB], 65536KB chunk
md1 : active raid1 sda2[2] sdb2[1]
523712 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda1[2] sdb1[1]
33521664 blocks super 1.2 [2/2] [UU]
unused devices: <none>
But we have two more drives (/dev/sdc
and /dev/sdd
), which we would like to setup as a data storage with RAID1 array as well. Therefore, the RAID array has to be added first:
mdadm --create --verbose /dev/md3 --level=1 --raid-devices=2 /dev/sdc /dev/sdd
The RAID configuration should now look as follows:
cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sdc1[0] sdd1[1]
2095040 blocks super 1.2 [2/2] [UU]
[====>................] resync = 32.7% (418656/2095040) finish=4.2min speed=131219K/sec
md2 : active raid1 sda3[2] sdb3[1]
234405504 blocks super 1.2 [2/2] [UU]
bitmap: 0/2 pages [0KB], 65536KB chunk
md1 : active raid1 sda2[2] sdb2[1]
523712 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda1[2] sdb1[1]
33521664 blocks super 1.2 [2/2] [UU]
unused devices: <none>
Now the new partition can be formatted (here with EXT4) and mounted:
mkfs.ext4 /dev/md3
mount /dev/md3 /mnt
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