Error with trying to resize software raid device

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# 1  
Old 01-05-2014
[SOLVED] Error with trying to resize software raid device


I have a failed raid array that is mismatched in size of the entire hard drives. The portions that are shared are, of course, the same. The smaller drive failed. Here is the working drive setup (a picture is worth 1000 words).


As you can see, I would like to grow sdb6 into the unallocated area.

This is my /proc/mdstat file

Personalities : [raid1] 
md0 : active raid1 sdb6[1]
      717040448 blocks super 1.2 [2/1] [_U]
unused devices: <none>

This is my fdisk -l
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00011318

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048    41945087    20971520   83  Linux
/dev/sdb2        41945088  1953523711   955789312    5  Extended
/dev/sdb5        41947136    54530047     6291456   82  Linux swap / Solaris
/dev/sdb6       519178240  1953523711   717172736   fd  Linux raid autodetect

Disk /dev/md0: 734.2 GB, 734249418752 bytes
2 heads, 4 sectors/track, 179260112 cylinders, total 1434080896 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

Disk /dev/md0 doesn't contain a valid partition table

And this is the saved error from gparted when I try to resize that partition.

GParted 0.12.1 --enable-libparted-dmraid

Libparted 2.3
Move /dev/sdb6 to the left and grow it from 683.95 GiB to 905.50 GiB  00:00:00    ( ERROR )
calibrate /dev/sdb6  00:00:00    ( SUCCESS )
path: /dev/sdb6
start: 519,178,240
end: 1,953,523,711
size: 1,434,345,472 (683.95 GiB)
check file system on /dev/sdb6 for errors and (if possible) fix them  00:00:00    ( ERROR )
e2fsck -f -y -v /dev/sdb6
ext2fs_check_desc: Corrupt group descriptor: bad block for block bitmap
e2fsck: Group descriptors look bad... trying backup blocks...
e2fsck: Bad magic number in super-block while using the backup blockse2fsck: going back to original superblock

Linux_HomeR2: ********** WARNING: Filesystem still has errors **********

e2fsck 1.42.5 (29-Jul-2012)
e2fsck: A block group is missing an inode table while checking ext3 journal for Linux_HomeR2


Of note, I am following the directions from a website

I got an error at this step:

#> mdadm --fail /dev/md0 /dev/sda1

With the error that it couldn't faulty the drive as the device or resource was busy. However, the device wasn't in use at all, so I'm not sure why it was saying that.

I tried the resize after successfully doing:

mdadm -S /dev/md0

This is when I tried the resize using gparted with the above error.

Any help is appreciated.

Last edited by Narnie; 01-11-2014 at 11:44 PM..
# 2  
Old 01-11-2014
It turns out that the directions actually left out steps. For anyone reading this thread, the step is after removing the offending drive by failing it first with:

# mdadm /dev/md0 --fail /dev/sda6

where /dev/md0 needs changed to your device as does /dev/sda6.

Then remove it with:

# mdadm /dev/md0 --remove /dev/sda6

changing the devices to meet your system.

What is left out I'm sure is that the partition needs erased. Then it needs rebuilt with the larger partition. Then added to the array.

# mdadm /dev/md0 --add /dev/sda6

Let it resync, then repeat on the other array member. I was trying to resize it and keep the info, which was a dumb thought.

I didn't get to follow this procedure because my array wouldn't sync due to a bad sector unrecoverable I/O error, so I had to backup, copy to a brand newly built array which I just created with the partition expanded in the first place.
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