linux – 慢速软件突袭

我有/和/ home的软件raid 1,似乎我没有获得正确的速度.

从md0读取我大约100 MB /秒
从sda或sdb读取我大约95-105 MB /秒

我以为我会从两个驱动器获得更快的速度(同时读取数据).我不知道是什么问题.

我正在使用内核2.6.31-18

hdparm -tT /dev/md0

/dev/md0: Timing cached reads: 2078
MB in 2.00 seconds = 1039.72 MB/sec
Timing buffered disk reads: 304 MB in
3.01 seconds = 100.96 MB/sec

hdparm -tT /dev/sda

/dev/sda: Timing cached reads: 2084
MB in 2.00 seconds = 1041.93 MB/sec
Timing buffered disk reads: 316 MB in
3.02 seconds = 104.77 MB/sec

hdparm -tT /dev/sdb

/dev/sdb: Timing cached reads: 2150
MB in 2.00 seconds = 1075.94 MB/sec
Timing buffered disk reads: 302 MB in
3.01 seconds = 100.47 MB/sec

编辑：
突袭1

解决方法

在nixCraf,HowTo: Speed Up Linux Software Raid Building And Re-syncing上查看以下文章.

它解释了/ proc中可以调整以影响软件raid速度的不同设置. (不仅仅是在标题建议的构建/同步过程中.)