[调查]硬盘速度（有测试方法）

afdlove

[root@localhost root]# hdparm -cdtT /dev/hdc

/dev/hdc:
IO_support   =  0 (default 16-bit)
using_dma    =  1 (on)
Timing buffer-cache reads:   128 MB in  0.36 seconds =358.60 MB/sec
Timing buffered disk reads:  64 MB in  2.10 seconds = 30.48 MB/sec
[root@localhost root]# hdparm -cdtT /dev/hdc

/dev/hdc:
IO_support   =  0 (default 16-bit)
using_dma    =  1 (on)

zlg88

/dev/sda:
Timing cached reads:   3440 MB in  2.00 seconds = 1717.69 MB/sec
Timing buffered disk reads:  216 MB in  3.00 seconds =  71.96 MB/sec

barrywong

/dev/sda:
Timing buffer-cache reads:   3900 MB in  2.00 seconds = 1950.00 MB/sec
Timing buffered disk reads:  254 MB in  3.00 seconds =  84.67 MB/sec

柳拂风

4200转的硬盘，不测也罢

火鸡

hdparm -tT /dev/sda

/dev/sda:
Timing cached reads:   3320 MB in  2.00 seconds = 1662.18 MB/sec
Timing buffered disk reads:  168 MB in  3.03 seconds =  55.38 MB/sec

wheel

[chenqs@localhost ~]$ hdparm -cdtT /dev/sda

/dev/sda:
Timing cached reads:   2784 MB in  2.00 seconds = 1491.52 MB/sec
Timing buffered disk reads:  302 MB in  3.02 seconds = 100.08 MB/sec

我的也是SATAII的硬盘。。。
ECS的GeForce6199SM-M的主板！
AM22800+的CPU..

luocy2008

原帖由 sniper 于 2006-12-21 09:58 发表
这是Raid 10

这是PC服务器上的SATA硬盘

还是pc机，IDE硬盘

你的RAID10怎么测的这么高，我的DELL2950的SAS硬盘RAID10结果如下：
[root@db root]# hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads:   2952 MB in  2.00 seconds = 1476.00 MB/sec
Timing buffered disk reads:  462 MB in  3.00 seconds = 154.00 MB/sec

下面这个是dell2850，SCSI的硬盘RAID5结果如下：
[root@db2 root]# hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads:   3352 MB in  2.00 seconds = 1676.00 MB/sec
Timing buffered disk reads:  244 MB in  3.01 seconds =  81.06 MB/sec
[root@db2 root]# hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads:   3108 MB in  2.00 seconds = 1554.00 MB/sec
Timing buffered disk reads:  398 MB in  3.07 seconds = 129.64 MB/sec
[root@db2 root]# hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads:   3492 MB in  2.00 seconds = 1746.00 MB/sec
Timing buffered disk reads:  194 MB in  3.01 seconds =  64.45 MB/sec


这个测的到底准不准啊，怎么几次结果都不一样，并且SAS，RAID10的性能应该要比RAID5，SCSI的要好啊？ 另外这两个参数是什么意思，以那个为准，Timing buffer-cache reads:  / Timing buffered disk reads:

LuckSnail

我来贴一个阵列柜的，14块15K的scsi盘，做的raid0+1
#hdparm tT /dev/cciss/c0d0p4

/dev/cciss/c0d0p4:
Timing cached reads:   3840 MB in  2.00 seconds = 1919.33 MB/sec
Timing buffered disk reads:  916 MB in  3.00 seconds = 304.97 MB/sec

anthonyfeng

buffer与cache 在linux 内有什么区别? 请指教