Mdraid

Prepare the hard drives

In this example we create a RAID just for storage, so we only have one Partition on each drive.

Code: GPT partition layout for RAID

/dev/sdb 2.7 TiB FD00 Linux RAID /dev/sdc 2.7 TiB FD00 Linux RAID

# gdisk /dev/sdb

We leave 100M of free space on the end of the device, just to be on the safe side if we have to replace a drive and won't be able to get an identical one which has the exact same amount of sectors.

Code: gdisk commands

Command (? for help): p Disk /dev/sdb: 5860533168 sectors, 2.7 TiB [...] n 1 enter -100M fd00 p w Y

Create the RAID array

RAID 1

# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1

RAID 5

# mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sd[b-d]1

Checking the progress

# cat /proc/mdstat

# mdadm --detail /dev/md0

# mdadm --examine /dev/sdb1

fstab

Code: /etc/fstab

UUID=b036ad79-939f-d4ae-e2c0-2f3f5c2e7087 /mnt/raid ext4 defaults,noatime