GROWING RAID+LVM

GROWING RAID+LVM

Step by step howto:

Add Drive	mdadm --add /dev/md0 /dev/sdb3
Tunning	echo 50000 > /proc/sys/dev/raid/speed_limit_min echo 200000 > /proc/sys/dev/raid/speed_limit_max
Grow the Array	mdadm --grow /dev/md0 --raid-devices=4
Resize PV	# pvresize /dev/md1   Physical volume "/dev/md1" changed   1 physical volume(s) resized or updated / 0 physical volume(s) not resized
Extend LV	# lvextend -L +400G -n /dev/XXXX00/LV-HOME   Size of logical volume XXXX00/LV-HOME changed from 565.66 GiB (144809 extents) to 965.66 GiB (247209 extents).   Logical volume XXXX00/LV-HOME successfully resized.
Grow filesystem	# resize2fs /dev/mapper/XXXX00-LV--HOME resize2fs 1.44.5 (15-Dec-2018) Filesystem at /dev/mapper/XXXX00-LV--HOME is mounted on /home; on-line resizing required old_desc_blocks = 71, new_desc_blocks = 121 The filesystem on /dev/mapper/XXXX00-LV--HOME is now 253142016 (4k) blocks long.
Check	# df -h /home Filesystem                   Size  Used Avail Use% Mounted on /dev/mapper/XXXX00-LV--HOME  950G  431G  477G  48% /home