# This is the expansion of the partition and filesystem onto the already
# expanded RAID5 array.
# Comments are added later to explain what is going on
# Note that the RAID expansion shown in the previous pictures took about 36
# hours but ran in the background.

Script started on Sun Jul  6 11:49:28 2008
asylum# cd
/root

# this is the before

asylum# df -hTP /home/asylum/kmk/media
Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/sda1      xfs    2.8T  2.7T   54G  99% /home/asylum/kmk/media
asylum# umount -v /home/asylum/kmk/media
/dev/sda1 umounted

# This is to force the kernel to notice that the disk is now bigger.  It will
# not actually touch the disk as we can't use *fdisk for much else.
# Of course you could reboot for the same effect but that would suck.
asylum# sfdisk -R /dev/sda

# this is just to show the existing GPT table.  Because the array is >2TB GPT
# and parted must be used instead of fdisk.

asylum# parted /dev/sda
Warning: GNU Parted has detected libreiserfs interface version mismatch.  Found 1-1, required 0. ReiserFS support will be disabled.
GNU Parted 1.8.8
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) p

Warning: Not all of the space available to /dev/sda appears to be used, you can fix the GPT to
use all of the space (an extra 1953124864 blocks) or continue with the current setting?
Fix/Ignore? i

Model: Areca Asylum Media R5 (scsi)
Disk /dev/sda: 4000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  3000GB  3000GB  xfs                     

(parted) quit

# This is the very scarry part....

asylum# parted /dev/sda
Warning: GNU Parted has detected libreiserfs interface version mismatch.  Found 1-1, required 0. ReiserFS support will be disabled.
GNU Parted 1.8.8
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) p

Warning: Not all of the space available to /dev/sda appears to be used, you can fix the GPT to
use all of the space (an extra 1953124864 blocks) or continue with the current setting? 
Fix/Ignore? f
Model: Areca Asylum Media R5 (scsi)
Disk /dev/sda: 4000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  3000GB  3000GB  xfs                     

(parted) resize 1 0 100%
No Implementation: Support for opening xfs file systems is not implemented yet.

# Unfortunately parted wants to control both the partition table and the
# filesystem instead of just doing the partition table like fdisk does.
# Because it insists on doing filesystem operations but cannot support XFS
# resizing (since XFS filesystems must be mounted to be resized) it can't just
# do a resize.  Instead we must delete the existing partition (YIKES!) and
# create a new one that starts in the same place.

(parted) rm 1
(parted) mkpart 1 0 100%
(parted) p

Model: Areca Asylum Media R5 (scsi)
Disk /dev/sda: 4000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  4000GB  4000GB  xfs                     

(parted) quit
Information: You may need to update /etc/fstab.

asylum# mount -v /home/asylum/kmk/media
/dev/sda1 on /home/asylum/kmk/media type xfs (rw,noatime,nodiratime)
asylum# df -hTP /home/asylum/kmk/media
Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/sda1      xfs    2.8T  2.7T   54G  99% /home/asylum/kmk/media

# Note that the df still looks the same because we forced parted to only
# operate on the partition table.  That means we still have to expand the
# filesystem.  Luckily with XFS that is fast and simple...

asylum# time xfs_growfs /home/asylum/kmk/media
meta-data=/dev/sda1              isize=256    agcount=32, agsize=22888181 blks
         =                       sectsz=512   attr=0
data     =                       bsize=4096   blocks=732421792, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096  
log      =internal               bsize=4096   blocks=32768, version=1
         =                       sectsz=512   sunit=0 blks, lazy-count=0
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 732421792 to 976562423
0.000u 0.012s 0:00.46 2.1%	0+0k 0+0io 2pf+0w

# Less than half a second!

asylum# df -hTP /home/asylum/kmk/media
Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/sda1      xfs    3.7T  2.7T  985G  74% /home/asylum/kmk/media

# It worked!!!!!!

Script done on Sun Jul  6 11:54:31 2008