On 3/15/2018 10:28 AM, Gary Stainburn wrote:
On Thursday 15 March 2018 13:59:39 Juan Martinez wrote:
Hi Gary,

You should use parted instead of fdisk to create the GPT and its
partitions. It should be able to handle larger partitions than fdisk.

Are you using mdadm for the RAID1 array?
I ended up using the following to clone the GPT table, and checked using
parted and it looked correct (sda and sdb match)

Yes I am using mdadm to control the RAID1 array. From all of the pages that I
have found, it should now be a case of going through each of my 'md' devices
and removing the dead partition and adding a new one.  What I'm not sure
about is how to remove the 'removed' entries, or whether they'll just
disappear once I add the replacement.

For example I have:

[root@lou log]# mdadm --detail /dev/md124
/dev/md124:
         Version : 1.2
   Creation Time : Thu Jun  5 11:16:44 2014
      Raid Level : raid1
      Array Size : 2770227008 (2641.89 GiB 2836.71 GB)
   Used Dev Size : 2770227008 (2641.89 GiB 2836.71 GB)
    Raid Devices : 2
   Total Devices : 1
     Persistence : Superblock is persistent

   Intent Bitmap : Internal

     Update Time : Wed Mar 14 21:37:24 2018
           State : active, degraded
  Active Devices : 1
Working Devices : 1
  Failed Devices : 0
   Spare Devices : 0

            Name : var_bacula
            UUID : 2d9ba248:b6d1236a:cf9ebd49:918bad94
          Events : 1275274

     Number   Major   Minor   RaidDevice State
        0       8        2        0      active sync   /dev/sda2
        1       0        0        1      removed
[root@lou log]#

To add the replacement device I should enter

 From everything I know I think I should enter

mdadm /dev/md124 --manage --add /dev/sdb2

as the two drives have identical partition tables, so sdb2 would match the
existing /dev/sda2.

An I correct, and will that replace the 'removed' line?

Presumably, I then simply follow the same rule for my remaining md devices?

/dev/md125
/dev/md126
/dev/md127
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If that doesn't work try: 'mdadm /dev/md124 --re-add /dev/sdb2'.

Bill

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