I have a system with 4 disks in a raid10 configuration. Here is the
output of mdadm:
bash-3.1# mdadm -D /dev/md_d0
/dev/md_d0:
Version : 00.90.03
Creation Time : Wed May 16 10:28:44 2007
Raid Level : raid10
Array Size : 3646464 (3.48 GiB 3.73 GB)
Used Dev Size : 2734848 (2.61 GiB 2.80 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Wed May 16 12:20:29 2007
State : active, resyncing
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : near=3, far=1
Chunk Size : 256K
Rebuild Status : 37% complete
UUID : fe3cad98:406511ae:3df46086:0a218818
Events : 0.1066
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
2 8 34 2 active sync /dev/sdc2
3 8 50 3 active sync /dev/sdd2
The problem arises when I do a drive removal such as sda and then I
remove power from the system. Most of the time I will have a corrupted
partition on the md device. Other corruption will be my root partition
which is an ext3 filesystem. I seem to have a better chance of booting
a least 1 time with no errors with bitmap turned on, but If I repeat
the process, I will have corruption as well. Also with bitmap turned
on, adding the new drive into the md device will take way to too long.
I only get about 3MB per second on the resync. With bitmap turned off,
I will get between 10MB to 15MB resync rate. Has anyone else seen this
behavior, or is this situation is no tested very often? I would think
that I shouldn't get corruption with this raid setup and jornaling of
my filesytems? Any help would be appreciated.
Don
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