Expanding storage

2017-02-21 23:00

Never thought I could fill out 2TB of local storage (I am not a multimedia person), but I finally did. Most of space is used by virtual machines and various lab setups. So, had to go shopping, and found out WD Red NAS 2TB HDDs are still most silent and price/performance option, so, bought x2.

Short log of expanding existing sw RAID1 + LVM setup with these:

Create second md mirror out of two new disks:

$ sudo mdadm --create --verbose /dev/md1 --level=1 --raid-devices=2 /dev/sdd /dev/sde

in separate terminal watch it sync (you can continue while it does):

$ watch -n 2 cat /proc/mdstat
Personalities : [raid1] 
md1 : active raid1 sde[1] sdd[0]
      1953383488 blocks super 1.2 [2/2] [UU]
      [===>.................]  resync = 18.7% (365601920/1953383488) finish=1210.4min speed=21860K/sec
      bitmap: 13/15 pages [52KB], 65536KB chunk
...

add md1 as a new physycal volume for LVM:

$ sudo pvcreate /dev/md1

extend existing volume group with a new volume:

$ sudo vgextend vg1 /dev/md1

check for logical volume mountpoint usage, stop services and umount:

$ sudo lsof /data
$ sudo /etc/init.d/samba stop
$ sudo /etc/init.d/headlessVM stop
$ sudo umount /data

extend logical volume:

$ sudo lvextend -l +100%FREE /dev/vg1/data

extend partition:

$ sudo e2fsck -f /dev/vg1/data
$ sudo resize2fs /dev/vg1/data

remount (it's in /etc/fstab), and start services:

$ sudo mount /data
$ sudo /etc/init.d/samba start
$ sudo /etc/init.d/headlessVM start

that's it:

$ df -h /data
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg1-data  3.4T  1.2T  2.1T  36% /data