Bonjour à tous,

J'ai monté un raid logiciel (mais pas en mirroring) pour doubler la perf de mes disques durs.

Quand je fais un hdparm sur chaque disque puis sur la grappe raid, j'obtiens ceci :

[root@pc-de-nicolas Nicolas]# hdparm -tT /dev/sda

/dev/sda:
Timing cached reads: 13148 MB in 2.00 seconds = 6585.43 MB/sec
Timing buffered disk reads: 288 MB in 3.00 seconds = 95.94 MB/sec

[root@pc-de-nicolas Nicolas]# hdparm -tT /dev/sdb

/dev/sdb:
Timing cached reads: 8400 MB in 2.00 seconds = 4207.53 MB/sec
Timing buffered disk reads: 274 MB in 3.00 seconds = 91.21 MB/sec

[root@pc-de-nicolas Nicolas]# hdparm -tT /dev/md2

/dev/md2:
Timing cached reads: 11546 MB in 2.00 seconds = 5787.34 MB/sec
Timing buffered disk reads: 292 MB in 3.01 seconds = 96.93 MB/sec


Pourquoi ya pas d'augmentation de performance ?
que renvoi "mdadm -D /dev/md0" ?
[root@pc-de-nicolas Nicolas]# mdadm -D /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Wed Apr 29 18:27:18 2009
Raid Level : raid1
Array Size : 200704 (196.03 MiB 205.52 MB)
Used Dev Size : 200704 (196.03 MiB 205.52 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Thu May 14 07:32:57 2009
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

UUID : b9b652a1:3b624361:2b4a27b2:711c2fd5
Events : 0.6

Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1


[root@pc-de-nicolas Nicolas]# mdadm -D /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Wed Apr 29 18:24:32 2009
Raid Level : raid0
Array Size : 20964352 (19.99 GiB 21.47 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent

Update Time : Wed Apr 29 18:24:32 2009
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Chunk Size : 256K

UUID : c5973261:400bffd3:3d53888b:9f0d5c88
Events : 0.1

Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3


[root@pc-de-nicolas Nicolas]# mdadm -D /dev/md2
/dev/md2:
Version : 0.90
Creation Time : Wed Apr 29 18:24:32 2009
Raid Level : raid0
Array Size : 4192768 (4.00 GiB 4.29 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent

Update Time : Wed Apr 29 18:24:32 2009
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Chunk Size : 256K

UUID : 69b88956:42a6a7a6:71b0230d:4926015e
Events : 0.1

Number Major Minor RaidDevice State
0 8 4 0 active sync /dev/sda4
1 8 20 1 active sync /dev/sdb4


[root@pc-de-nicolas Nicolas]# mdadm -D /dev/md3
/dev/md3:
Version : 0.90
Creation Time : Wed Apr 29 18:24:39 2009
Raid Level : raid0
Array Size : 951208448 (907.14 GiB 974.04 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 3
Persistence : Superblock is persistent

Update Time : Wed Apr 29 18:24:39 2009
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Chunk Size : 256K

UUID : c6b10050:748521cf:91fb307d:2472bfbd
Events : 0.1

Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2