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Changing My RAID Array, Add A Device And Resync

My previous post discussed removing a block device and partitioning it. 

After creating the 2TB partition I can now add it to the existing array.

$mdadm /dev/md127 --add /dev/sda2        ##to add the 2TB partition (block device) to the array

$mdadm --detail /dev/md127        ##to check status of the array and component device

/dev/md127:
        Version : 1.2
  Creation Time : Tue Sep  6 02:59:21 2016
     Raid Level : raid5
     Array Size : 2929890816 (2794.16 GiB 3000.21 GB)
  Used Dev Size : 976630272 (931.39 GiB 1000.07 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sat Dec  2 10:00:56 2017
          State : clean, degraded, recovering
 Active Devices : 3
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 512K

 Rebuild Status : 24% complete

           Name : desktop:0
           UUID : e3284314:1258cac3:1b6c243c:748be2fe
         Events : 8551

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1
       3       8       64        2      active sync   /dev/sde
       4       8        2        3      spare rebuilding   /dev/sda2    ==>> note that mdadm added it as a spare first, with status "rebuilding".

Also check with command,

$sudo less /proc/mdstat

Personalities : [raid6] [raid5] [raid4]
md127 : active raid5 sda2[4] sdd1[1] sdc1[0] sde[3]
      2929890816 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_]
      [=====>...............]  recovery = 26.8% (262702200/976630272) finish=102.1min speed=116481K/sec
      bitmap: 0/8 pages [0KB], 65536KB chunk

unused devices: <none>
 
I like this command because it gives me recovery/rebuilding time and progress. I forgot how to execute it in real time. Also, I found out I could type /proc/mdstat on Firefox address bar and it will show my machine's file up on the tab. I can just refresh the page. Nice.

The resync begins automatically after I added the block device. This is all hot-plugging. I have not removed or added a physical device in actual terms.


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