现在 [ 152 ] 楼的硬盘最牛！@MyPC:~$ sudo hdparm -tT /dev/sda <---输这个看看你的
/dev/sda:
Timing buffered disk reads: 118 MB in 3.01 seconds = 39.16 MB/sec
Timing cached reads: 214 MB in 2.01 seconds = 106.48 MB/sec
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－嘿嘿，哪个有我这个快？，不跑应用时，可以稳超320MB/sec。
$ sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 3192 MB in 2.00 seconds = 1598.58 MB/sec
Timing buffered disk reads: 882 MB in 3.02 seconds = 292.49 MB/sec
$ sudo fdisk -l
Disk /dev/sda: 583.9 GB, 583998111744 bytes
255 heads, 63 sectors/track, 71000 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000080
Device Boot Start End Blocks Id System
/dev/sda1 * 1 24 192748+ 83 Linux
/dev/sda2 25 486 3711015 82 Linux swap / Solaris
/dev/sda3 487 71000 566403705 83 Linux
4个147G的10000转的硬盘组成的raid0。
@MyPC:~$ hdparm
hdparm - get/set hard disk parameters - version v6.9
Usage: hdparm [options] [device] ..
Options:
-a get/set fs readahead
-A set drive read-lookahead flag (0/1)
-b get/set bus state (0 == off, 1 == on, 2 == tristate)
-B set Advanced Power Management setting (1-255)
-D enable/disable drive defect management-c get/set IDE 32-bit IO setting （sudo hdparm c 1 /dev/hda , 设置32位总线）
-C check IDE power mode status
-d get/set using_dma flag （sudo hdparm d 1 /dev/hda , 设置DMA）
--direct use O_DIRECT to bypass page cache for timings
如果系统识别为IDE硬盘，这两个改了可能有提升效果
-E set cd-rom drive speed
-f flush buffer cache for device on exit
-g display drive geometry
-h display terse usage information
-H read temperature from drive (Hitachi only)
-i display drive identification
-I detailed/current information directly from drive
--Istdin read identify data from stdin as ASCII hex
--Istdout write identify data to stdout as ASCII hex
-k get/set keep_settings_over_reset flag (0/1)
-K set drive keep_features_over_reset flag (0/1)
-L set drive doorlock (0/1) (removable harddisks only)
-M get/set acoustic management (0-254, 128: quiet, 254: fast) (EXPERIMENTAL)
-m get/set multiple sector count
-n get/set ignore-write-errors flag (0/1)
-p set PIO mode on IDE interface chipset (0,1,2,3,4,...)
-P set drive prefetch count
-q change next setting quietly
-Q get/set DMA tagged-queuing depth (if supported)
-r get/set device readonly flag (DANGEROUS to set)
-R register an IDE interface (DANGEROUS)
-s set power-up in standby flag (0/1)
-S set standby (spindown) timeout
-t perform device read timings
-T perform cache read timings
-u get/set unmaskirq flag (0/1)
-U un-register an IDE interface (DANGEROUS)
-v defaults; same as -mcudkrag for IDE drives
-V display program version and exit immediately
-w perform device reset (DANGEROUS)
-W set drive write-caching flag (0/1) (DANGEROUS)
-x tristate device for hotswap (0/1) (DANGEROUS)
-X set IDE xfer mode (DANGEROUS)
-y put IDE drive in standby mode
-Y put IDE drive to sleep
-Z disable Seagate auto-powersaving mode
-z re-read partition table
--security-help display help for ATA security commands
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how about U ?
