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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