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From: Roland RoLaNd <r_o_l_a_n_d@hotmail.com>
To: "linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: can i recover an all spare raid10 array ?
Date: Tue, 28 Oct 2014 18:22:11 +0200	[thread overview]
Message-ID: <DUB121-W342C9D8FABB014826217FA8A9F0@phx.gbl> (raw)

I have two raid arrays on my system:
raid1: /dev/sdd1 /dev/sdh1
raid10: /dev/sde1 /dev/sda1 /dev/sdf1 /dec/sdb1 /dev/sdc1 /dev/sdg1


two disks had bad sectors: sdd and sdf <<-- they both got hot swapped. i added sdf back to raid10 and recovery took place but adding sdd1 to raid1 proved to be troublesome
as i didn't have anything important on '/' i formatted and installed ubuntu 14 on raid1 

now system is up on raid 1, but raid10 (md127) is inactive

cat /proc/mdstat

Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md127 : inactive sde1[2](S) sdg1[8](S) sdc1[6](S) sdb1[5](S) sdf1[4](S) sda1[3](S)
      17580804096 blocks super 1.2
       
md2 : active raid1 sdh4[0] sdd4[1]
      2921839424 blocks super 1.2 [2/2] [UU]
      [==>..................]  resync = 10.4% (304322368/2921839424) finish=672.5min speed=64861K/sec
      
md1 : active raid1 sdh3[0] sdd3[1]
      7996352 blocks super 1.2 [2/2] [UU]
      
md0 : active raid1 sdh2[0] sdd2[1]
      292544 blocks super 1.2 [2/2] [UU]
      
unused devices: <none>
if i try to assemble md127 
  

  mdadm --assemble /dev/md127 /dev/sde1 /dev/sda1 /dev/sdf1 /dev/sdb1 /dev/sdc1 /dev/sdg1
mdadm: /dev/sde1 is busy - skipping
mdadm: /dev/sda1 is busy - skipping
mdadm: /dev/sdf1 is busy - skipping
mdadm: /dev/sdb1 is busy - skipping
mdadm: /dev/sdc1 is busy - skipping
mdadm: /dev/sdg1 is busy - skipping


if i try to add one of the disks:  mdadm --add /dev/md127 /dev/sdj1
mdadm: cannot get array info for /dev/md127

if i try:

mdadm --stop /dev/md127
mdadm: stopped /dev/md127

then running:   mdadm --assemble /dev/md127 /dev/sde1 /dev/sda1 /dev/sdf1 /dev/sdb1 /dev/sdc1 /dev/sdg1

returns: 
 
assembled from 5 drives and 1 rebuilding - not enough to start the array

what does it mean ? is my data lost ? 

if i examine one of the md127 raid 10 array disks it shows this:
 
mdadm --examine /dev/sde1
/dev/sde1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : ab90d4c8:41a55e14:635025cc:28f0ee76
           Name : ubuntu:data  (local to host ubuntu)
  Creation Time : Sat May 10 21:54:56 2014
     Raid Level : raid10
   Raid Devices : 8

 Avail Dev Size : 5860268032 (2794.39 GiB 3000.46 GB)
     Array Size : 11720534016 (11177.57 GiB 12001.83 GB)
  Used Dev Size : 5860267008 (2794.39 GiB 3000.46 GB)
    Data Offset : 262144 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : a2a5db61:bd79f0ae:99d97f17:21c4a619

    Update Time : Tue Oct 28 10:07:18 2014
       Checksum : 409deeb4 - correct
         Events : 8655

         Layout : near=2
     Chunk Size : 512K

   Device Role : Active device 2
   Array State : AAAAAAAA ('A' == active, '.' == missing)

Used Dev Size : 5860267008 (2794.39 GiB 3000.46 GB) <<--- does this mean i still have my data ?  


the remaining two disks:

  mdadm --examine /dev/sdj1
mdadm: No md superblock detected on /dev/sdj1.
  mdadm --examine /dev/sdi1
mdadm: No md superblock detected on /dev/sdi1. 		 	   		  --
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             reply	other threads:[~2014-10-28 16:22 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-28 16:22 Roland RoLaNd [this message]
2014-10-28 17:01 ` can i recover an all spare raid10 array ? Robin Hill
     [not found]   ` <DUB121-W268A97DFB2DCC142617CED8A9F0@phx.gbl>
2014-10-28 18:10     ` FW: " Roland RoLaNd
     [not found]     ` <DUB121-W26D4B9D346A4A0A0407CD38A9F0@phx.gbl>
2014-10-28 18:11       ` Roland RoLaNd
2014-10-28 18:34       ` Robin Hill
2014-10-28 19:11         ` Roland RoLaNd
2014-10-28 20:02           ` Robin Hill
2014-10-28 20:17             ` Roland RoLaNd
2014-10-28 20:46               ` Robin Hill

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