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The New Disk
Disk /dev/sdd: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x638212f6

Device Boot Start End Blocks Id System
/dev/sdd1 1 30401 244196001 fd Linux raid autodetect


The Old Disk(s)
Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sda1 1 30401 244196001 fd Linux raid autodetect


They Match!

Time to add the new drive
mdadm --add /dev/md0 /dev/sdd1
mdadm: added /dev/sdd1

Now to grow the array
mdadm --grow /dev/md0 --raid-devices=4
mdadm: Need to backup 768K of critical section..
mdadm: ... critical section passed.


The growing/reshaping took 9 hours.

Time to check the integrity of the filesystem

fsck -f /dev/md0
fsck 1.40.8 (13-Mar-2008)
e2fsck 1.40.8 (13-Mar-2008)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
RAID: 96834/61063168 files (31.4% non-contiguous), 104634355/122097920 blocks


Now to resize the filesystem

resize2fs /dev/md0
resize2fs 1.40.8 (13-Mar-2008)
Resizing the filesystem on /dev/md0 to 183146880 (4k) blocks.
The filesystem on /dev/md0 is now 183146880 blocks long.


Whoohoo!