From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Smith <andy@strugglers.net>
Subject: Re: Shrinking number of devices on a RAID-10 (near 2) array
Date: Mon, 25 Aug 2014 11:34:03 +0000
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To: NeilBrown <neilb@suse.de>
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Hi Neil,

On Mon, Aug 25, 2014 at 09:26:14PM +1000, NeilBrown wrote:
> What does "mdadm --examine" on one of the devices report now that it is v1.0?
> 
> Particularly interested in the "Unused Space :" line.

/dev/sda3:
          Magic : a92b4efc
        Version : 1.0
    Feature Map : 0x0
     Array UUID : 3905b303:ca604b72:be5949c4:ab051b7a
           Name : 2
  Creation Time : Sun Jun  4 08:18:59 2006
     Raid Level : raid10
   Raid Devices : 6

 Avail Dev Size : 618726528 (295.03 GiB 316.79 GB)
     Array Size : 928089792 (885.10 GiB 950.36 GB)
   Super Offset : 618727392 sectors
   Unused Space : before=0 sectors, after=864 sectors
          State : active
    Device UUID : e30176be:81a57e84:1f2aa206:9515150f

    Update Time : Sun Aug 24 14:29:15 2014
       Checksum : bd599c72 - correct
         Events : 1

         Layout : near=2
     Chunk Size : 64K

   Device Role : Active device 5
   Array State : AAAAAA ('A' == active, '.' == missing, 'R' == replacing)

All other devices report same (apart from UUID/checksum/role).

Cheers,
Andy