lenteur de reconstruction raid5 logiciel
Bonjour,
Pourquoi la reconstruction est si lente par rapport aux raid1?
( calcul de la parité mais quand même )
Voici qqs infos:
controleur scsi : Adaptec AIC-7902B U320 (rev 10)
cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5] [raid4]
md4 : active raid5 sdc9[3] sdb9[1] sda9[0]
518706432 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
[=====>...............] recovery = 26.7% (69461248/259353216) finish=619.8min speed=5104K/sec
md1 : active raid1 sda6[0] sdb6[1]
979840 blocks [2/2] [UU]
md2 : active raid1 sda7[0] sdb7[1]
9767424 blocks [2/2] [UU]
md3 : active raid1 sda8[0] sdb8[1]
19534912 blocks [2/2] [UU]
md0 : active raid1 sda5[0] sdb5[1]
979840 blocks [2/2] [UU]
~# iostat
Linux 2.6.16.20-grsec (xxxx) 22.06.2006
cpu-moy: %user %nice %sys %iowait %idle
0,01 0,00 0,23 0,07 99,69
Device: tps Blk_lus/s Blk_écrits/s Blk_lus Blk_écrits
sda 49,59 5527,00 2557,36 138783680 64215654
sdb 49,29 8020,62 67,85 201398768 1703718
sdc 28,36 0,01 5525,71 264 138751278
md0 3,82 0,88 30,33 22016 761496
md3 0,32 2,14 2,31 53768 58064
md2 1,59 3,17 12,32 79568 309256
md1 0,01 0,00 0,05 112 1312
md: linear personality registered for level -1
md: raid0 personality registered for level 0
md: raid1 personality registered for level 1
md: raid5 personality registered for level 5
md: raid4 personality registered for level 4
raid5: automatically using best checksumming function: generic_sse
generic_sse: 7312.000 MB/sec
raid5: using function: generic_sse (7312.000 MB/sec)
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
--
Vincent Lenouvel - <vincent@info.unicaen.fr>
Université de Caen, Campus II, Bd Maréchal Juin, BP 5186, 14032 Caen
Empreinte de la clé = D14D EFE9 4F55 AF89 98B0 666B 17E5 C840 4B0D 80E4
wget -O - http://users.info.unicaen.fr/~vincent/signature.asc | gpg --import
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