nTh among all

Followed the guide here: ubuntuforums.org/showthread.php?t=713936

Once again, LVM is awesome.

Reproduced:

1. install your disk into the system.
2. Get the name of the disk you want to add:

Quote:

[root@e6400:/home/moon/ 519]$lshw -C disk *-disk:0 description: SCSI Disk product: ST3320620AS vendor: ATA physical id: 0 bus info: scsi@0:0.0.0 logical name: /dev/sda version: 3.AA serial: 3QF0AL47 size: 298GB capabilities: partitioned partitioned:dos configuration: ansiversion=5 *-disk:1 description: SCSI Disk product: ST3320620AS vendor: ATA physical id: 1 bus info: scsi@1:0.0.0 logical name: /dev/sdb version: 3.AA serial: 5QF0PEWW size: 298GB capabilities: partitioned partitioned:dos configuration: ansiversion=5 *-disk:2 description: SCSI Disk product: ST3320620AS vendor: ATA physical id: 2 bus info: scsi@4:0.0.0 logical name: /dev/sdc version: 3.AA serial: 5QF0DMH5 size: 298GB capabilities: partitioned partitioned:dos configuration: ansiversion=5 *-disk:3 description: SCSI Disk product: ST3320620AS vendor: ATA physical id: 3 bus info: scsi@5:0.0.0 logical name: /dev/sdd version: 3.AA serial: 5QF0S6XE size: 298GB capabilities: partitioned partitioned:dos configuration: ansiversion=5

So the disk i want to add in is /dev/sdd

2. Partion this disk based on an existing disk in the array assuming /dev/sdb is already in the array:

Copy the partition from the existing drive in the raid.

Quote:

sfdisk -d /dev/sdb > partitions.sdb

edit the partitions.sdb file and change all the references to sdb to sdd

Now we partition the new drive

Quote:

sfdisk /dev/sdd < partitions.sdb

note:
I have 2 partition on my drive
/dev/sdd1 – Raid 0 on /dev/md0
/dev/sdd2 – Raid 5 on /dev/md1

3. Clean the superblock on the new drive partitions (In case it was in another Raid) either way it won’t hurt.

Quote:

mdadm –zero-superblock /dev/sdd1 mdadm –zero-superblock /dev/sdd2

4. Add the new drives to the arry, i have a Raid 0 for partition /dev/sdd1 and a Raid 5 for partition /dev/sdd2
Set raid-devices to the new number of devices in your array, i previously had 3.

Quote:

mdadm –add /dev/md0 /dev/sdd1 mdadm –grow /dev/md0 –raid-devices=4  mdadm –add /dev/md1 /dev/sdd2 mdadm –grow /dev/md1 –raid-devices=4

5. My Raid 0 (/dev/md0) is done, this is my /boot.

6. WAIT a long time for the Raid to rebuild itself. To check the progress run this command:

Quote:

cat /proc/mdstat

7. When it is finally done you should be able to see the new size of the Raid arry:

Quote:

[root@e6400:/home/moon/ 503]$mdadm -D /dev/md1 /dev/md1: Version : 00.90.03 Creation Time : Sat Mar 1 06:36:40 2008 Raid Level : raid5 Array Size : 937488768 (894.06 GiB 959.99 GB) Used Dev Size : 312496256 (298.02 GiB 320.00 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 1 Persistence : Superblock is persistent  Update Time : Mon Mar 3 09:39:06 2008 State : active Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 64K UUID : 6edd19d2:6bc3e59d:ce21a63d:f12f7b33 Events : 0.208309 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 1 8 18 1 active sync /dev/sdb2 2 8 34 2 active sync /dev/sdc2 3 8 50 3 active sync /dev/sdd2

8. Now we have to make changes to our LVM.

Resize our physical volume

Quote:

[root@e6400:~/ 499]$pvresize /dev/md1 Physical volume “/dev/md1” changed 1 physical volume(s) resized / 0 physical volume(s) not resized [root@e6400:~/ 500]$pvdisplay — Physical volume — PV Name /dev/md1 VG Name VG_E6400 PV Size 894.06 GB / not usable 192.00 KB Allocatable yes PE Size (KByte) 4096 Total PE 228879 Free PE 76293 Allocated PE 152586 PV UUID dw0IGv-j1WA-hd63-mY3K-i6mJ-4yX6-MQftH8

9. Resize our logical volume:

Quote:

[root@e6400:/home/moon/ 503]$lvresize -l 95%VG /dev/VG_E6400/LV_E6400

For some reason it would not let me use 100%, so i had to add the rest of the free disk (38.7GB) space using the resize command again:

Quote:

[root@e6400:/home/moon/ 503]$lvresize -L +38.7G /dev/VG_E6400/LV_E6400

10. Check that your LV was resized correctly:

Quote:

[root@e6400:/home/moon/ 503]$lvdisplay — Logical volume — LV Name /dev/VG_E6400/LV_E6400 VG Name VG_E6400 LV UUID JIdQXg-C6Rv-WLq9-I61F-Foss-N8jE-wG13IQ LV Write Access read/write LV Status available # open 1 LV Size 888.06 GB Current LE 227343 Segments 1 Allocation inherit Read ahead sectors 0 Block device 254:1

11. If everything looks good, resize your file system (i use ext 3 you may have to run a different cmd if you run a differnt FS). My volume was mouted as the root filesystem, so it did an online resize. This is probably dangerous.

Quote:

[root@e6400:/home/moon/ 503]$resize2fs /dev/VG_E6400/LV_E6400

12. CHeck your disk space:

Quote:

[root@e6400:/home/moon/ 503]$df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VG_E6400-LV_E6400
875G 267G 564G 33% /