I all,
a couple of weeks ago I've updated the kernel (now I'm using .27-7)
and mdadm to version 2.6.7 and now I have terrible RAID1 performance:
during I/O operation I have 100% cpu utilization and all the system
freeze until the operation ends. Seeking and reading from the RAID is
extremely slow (sometime 4 or 5 seconds just to show an "ls -l"
output) and writing is even worst.
I've tested the same hard disk without RAID and It seem working well.
This is the output of mdadm -D /dev/md*
/dev/md0:
Version : 00.90
Creation Time : Sat May 3 21:53:16 2008
Raid Level : raid1
Array Size : 7815488 (7.45 GiB 8.00 GB)
Used Dev Size : 7815488 (7.45 GiB 8.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Dec 12 13:46:27 2008
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 2a37b0a1:4b6b28fc:0209446b:c3b28f2a
Events : 0.142
Number Major Minor RaidDevice State
0 8 37 0 active sync /dev/sdc5
1 8 17 1 active sync /dev/sdb1
/dev/md1:
Version : 00.90
Creation Time : Sat May 3 21:53:32 2008
Raid Level : raid1
Array Size : 152264000 (145.21 GiB 155.92 GB)
Used Dev Size : 152264000 (145.21 GiB 155.92 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Fri Dec 12 13:46:27 2008
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 19c49c5d:e3193aa1:657f267b:b23c2dee
Events : 0.14
Number Major Minor RaidDevice State
0 8 38 0 active sync /dev/sdc6
1 8 18 1 active sync /dev/sdb2
/dev/md2:
Version : 00.90
Creation Time : Mon May 5 03:39:59 2008
Raid Level : raid1
Array Size : 293049600 (279.47 GiB 300.08 GB)
Used Dev Size : 293049600 (279.47 GiB 300.08 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Fri Dec 12 13:37:06 2008
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 62a5cb51:36ca61a3:1298e6c2:30fde3ba
Events : 0.20
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 33 1 active sync /dev/sdc1
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