Hello, list, Neil,
First i want to thanks, to Neil, for the mdadm! :-)
On the last week, i have successfully recover my 12 disk raid4 array with
mdadm, from 10 good, 2 failed, and +1 disk with one day older parity infos.
I have saved about 14TB data, and only lost about 40-50GB! (Raid0-stripped
4x3.3TB and XFS)
Thanks, Neil!
Anyway, i have some questions too:
After i more times re-create the full raid4 array, i cannot add back the
bitmap!
[root@st-0003 ~]# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid5] [raid4] [raid6]
[multi
path] [faulty]
md0 : active raid4 hda1[0] sde1[11] sdi1[10] sdd1[9] sdj1[8] sdh1[7] sdg1[6]
sdf
1[5] sdc1[4] sda1[3] sdb1[2] hdb1[1]
3223457600 blocks level 4, 4k chunk, algorithm 0 [12/12]
[UUUUUUUUUUUU]
unused devices: <none>
[root@st-0003 ~]# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Fri Jun 9 08:27:26 2006
Raid Level : raid4
Array Size : 3223457600 (3074.13 GiB 3300.82 GB)
Device Size : 293041600 (279.47 GiB 300.07 GB)
Raid Devices : 12
Total Devices : 12
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Jun 14 00:10:23 2006
State : clean
Active Devices : 12
Working Devices : 12
Failed Devices : 0
Spare Devices : 0
Chunk Size : 4K
UUID : 3eec5a2c:812deda6:1219fc67:edc77e6e
Events : 0.153457
Number Major Minor RaidDevice State
0 3 1 0 active sync /dev/hda1
1 3 65 1 active sync /dev/hdb1
2 8 17 2 active sync /dev/sdb1
3 8 1 3 active sync /dev/sda1
4 8 33 4 active sync /dev/sdc1
5 8 81 5 active sync /dev/sdf1
6 8 97 6 active sync /dev/sdg1
7 8 113 7 active sync /dev/sdh1
8 8 145 8 active sync /dev/sdj1
9 8 49 9 active sync /dev/sdd1
10 8 129 10 active sync /dev/sdi1
11 8 65 11 active sync /dev/sde1
[root@st-0003 ~]# time mdadm -G /dev/md0 --bitmap=internal
mdadm: failed to set internal bitmap.
real 0m8.645s
user 0m0.070s
sys 0m1.600s
[root@st-0003 ~]#
Why? :-)
And another one question:
Why are the bitmap support disabled in the latest kernels for raid4?
It works really good, i have tested it a lot of times! ;-)
(Neil sent me a little patch to enable it before...)
Thanks
Janos
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