Did you resize the file system? I have two 5.5 TB arrays (one 4 disk RAID
5 and one 5 disk RAID 6) both built via mdadm. One of the arrays has been
resized 4 times over the years.
What distro and kernel are you running? I seem to remember there being a
kernel parameter for large block devices (config_lbd IIRC) back in the
earlier 2.6.xx days (that parameter does not seem to be present on on my
3.5.xx+ kernels).
My RAID 6 array:
sudo mdadm --detail /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Sat Aug 25 23:02:27 2012
Raid Level : raid6
Array Size : 5860125696 (5588.65 GiB 6000.77 GB)
Used Dev Size : 1953375232 (1862.88 GiB 2000.26 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Thu Sep 26 08:07:02 2013
State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : cygnus:md-backup0 (local to host cygnus)
UUID : bd5bb90e:853a22ab:1dcc9120:9f320b29
Events : 65908
Number Major Minor RaidDevice State
0 8 98 0 active sync /dev/sdg2
1 8 66 1 active sync /dev/sde2
2 8 50 2 active sync /dev/sdd2
3 8 82 3 active sync /dev/sdf2
5 65 18 4 active sync /dev/sdr2
One quick note, RAID 5 is actually dangerous and not something I would
recommend if you care about the data. If you lose one device you are at a
higher risk when the array rebuilds and you are thrashing the remaining
disks.
On Thu, Sep 26, 2013 at 7:52 AM, Andrew Robinson
<and...@boohahaonline.com>wrote:
> Hey has anyone run into issues with trying to grow a Linux software raid?
> I’ve just finished syncing all of my data from 3x2TB (in raid 5) to 3x3TB
> (still raid 5). The raid array should show a capacity of approx. 5.5 TB,
> but instead shows only 4. I’ve tried re running the mdadm –grow command
> but with no success. Is there are a hard limit to the size of the array in
> Linux?****
>
> ** **
>
> I should mention that each of these drives are formatted as GTP drives,
> with 1 partition of type FD that consumes the entire 2.79 TB of space on
> each drive.****
>
> ** **
>
> I’ve been using he instructions located at
> https://raid.wiki.kernel.org/index.php/Growing#Expanding_existing_partitionsif
> anyone is curious to what I’ve done so far
> ****
>
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