I am using LVM onto of this array.  As for the other part of your question here 
is the output from mdadm --detail.  I have 1 disk removed at the moment because 
I'm trying to reformat it with parted instead of fdisk to see if it makes a 
difference

[root@galactica ~]# mdadm --detail /dev/md127
/dev/md127:
        Version : 1.1
  Creation Time : Fri Feb  1 20:11:04 2013
     Raid Level : raid5
     Array Size : 4294704128 (4095.75 GiB 4397.78 GB)
  Used Dev Size : 2147352064 (2047.87 GiB 2198.89 GB)
   Raid Devices : 3
  Total Devices : 2
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Thu Sep 26 10:09:24 2013
          State : active, degraded
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 512K

           Name : galactica:0
           UUID : 6fb8be74:16a6952f:12ccd1c5:143166cf
         Events : 94287

    Number   Major   Minor   RaidDevice State
       4       8       33        0      active sync   /dev/sdc1
       5       8       49        1      active sync   /dev/sdd1
       2       0        0        2      removed




-----Original message-----
From: Gustin Johnson <gus...@meganerd.ca>
Sent: Thursday 26th September 2013 11:42
To: CLUG General <clug-talk@clug.ca>
Subject: Re: [clug-talk] software raid question

I forgot to ask some other relevant questions:
Are you using LVM on this array?  How are you not seeing the increase in space 
(are you using df or mdadm --detail to get this information)?


On Thu, Sep 26, 2013 at 11:36 AM, Dan Graham <graha...@gmail.com> wrote:
Hi Andrew, are you using the raid for boot and root?


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_partitions if 
anyone is curious to what I’ve done so far


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