RAID Cheatsheet

RAID Cheetsheet

# RAID Cheatsheet

Findings along my way of managing my own NAS and RAID

1. Re-Assembling a RAID when the disks are avaiable but not active

```sh
mdadm --assemble --scan --verbose --force
```
Generally if it thinks everythings a space it will try and fail to start up the RAID,
adding force ensures that all found disks get addedto the RAID

## Increase RAID size

1. Add the drive to the ARRAY

```sh
mdadm /dev/md127 --add /dev/sdd1
```

2. Grow the array

```sh
mdadm --grow --raid-devices=<num devices> --spares=<num spares> --backup-file=/root/md127_grow.bak /dev/md127
```

3. Wait until the raid finishes 

```sh
watch cat /prod/mdstat
```

4. Grow the PV

```sh
pvresize /dev/md127
```

5. Grow the LV

```sh
lvexend -l +100%FREE /dev/<pv>/<lv>
```

6. Increae the LUKS partiition

```sh
cryptsetup resize <crypt> -d /path/too/file.key
```

7. Increase BTRFS size

```sh
btrfs filesystem resize max /path/to/fs
```