KfWiki: Linux RAID

Storage » SoftwareRAID

# Scan existing raid config
mdadm --detail --scan
# Scan existing raid volumes and perform assembly
mdadm -A --scan

Create a volume with missing drive

mdadm --create /dev/md3 --level=1 --raid-devices=2 /dev/sdb6 missing

Add a device to a raid volume

mdadm /dev/md3 --add /dev/sda6

If you are running raid4,5,6, setting a higher stripe cache may boost write performance signficantly

echo 8192 > /sys/block/md2/md/stripe_cache_size

KfWiki : SoftwareRAID