====== Resize_raid_array_and_create_second_array ======

Misc commands to resize raid array and create a second array

 parted /dev/sda
 #resize 3
 #gave out an error saying unsupported features. It showed what features were supported with resize. I needed to see what features were been used on the partition:
 dumpe2fs /dev/sda3
 debugfs -w /dev/sda3 -R "features ^ext_attr"
 debugfs -w /dev/sda3 -R "features ^resize_inode"
 parted was then able to resize the partitions.

 mdadm --create /dev/md3 --level 1 --raid-devices=2 /dev/sda3 /dev/sdb3
 #I tried to assemble the md2 array using mdadm --assemble /dev/md2 /dev/sda3 /dev/sdb3 but it said that there was no superblock found. 
 #mdadm examine and detail of md2 and the individual partitions showed no superblock either. 
 #As a result the array had to be created with the above command. It also resynced itself ok.

 mdadm --create /dev/md3 --level 1 --raid-devices=2 /dev/sda4 /dev/sdb4
 pvcreate /dev/md3
 vgcreate mainvol /dev/md3

**Make sure to update /etc/mdadm/mdadm.conf with the correct UUID (mdadm --examine --scan) otherwise the mdadm wont auto assembly on boot.**

Links:
http://kevin.deldycke.com/2007/03/how-to-recover-a-raid-array-after-having-zero-ized-superblocks/
http://wiki.kartbuilding.net/index.php/RAID_1_and_Xen_(dom0)
http://wiki.kartbuilding.net/index.php/LVM_on_XEN_(dom0)
http://serverfault.com/questions/43897/how-do-i-get-mdadm-to-auto-assemble-my-raid-array

====== Old / Not used ======
The following below didn't work. It is just here for reference.

 e2fsck -f /dev/md2
 resize2fs /dev/md2 300G
 mdadm --grow /dev/md2 --size=335544320  (use 320GB to be save. 320 x 1024 x 1024)
 resize2fs /dev/md2
 e2fsck -f /dev/md2
 Link: http://www.howtoforge.com/how-to-resize-raid-partitions-shrink-and-grow-software-raid