[root@KTIDC22 ~]$ dd bs=1k count=1000000 if=/dev/zero of=hdd
1000000+0 records in
1000000+0 records out
1024000000 bytes (1.0 GB) copied, 19.2714 s, 53.1 MB/s
/// disk 에 생긴 테스트용 파일 삭제
[root@KTIDC22 ~]$ rm -f hdd
[root@localhost pub]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
19552940 11996244 6547444 65% /
/dev/sda1 194442 28489 155914 16% /boot
tmpfs 192552 12 192540 1% /dev/shm
/// 도움말 보기
/// 원래는 hard disk parameters를 변경해주는 유틸인듯 한데 속도측정기능이 있다.
/// 단, Read 성능만 측정가능
# hdparm -h
hdparm - get/set hard disk parameters - version v7.7
Usage: hdparm [options] [device] ..
Options:
-a get/set fs readahead
-A get/set the drive look-ahead flag (0/1)
-b get/set bus state (0 == off, 1 == on, 2 == tristate)
-B set Advanced Power Management setting (1-255)
-c get/set IDE 32-bit IO setting
-C check drive power mode status
-d get/set using_dma flag
-D enable/disable drive defect management
-E set cd-rom drive speed
-f flush buffer cache for device on exit
-F flush drive write cache
-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
-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)
-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) (DANGEROUS)
-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 -acdgkmur for IDE drives
-V display program version and exit immediately
-w perform device reset (DANGEROUS)
-W get/set drive write-caching flag (0/1)
-x tristate device for hotswap (0/1) (DANGEROUS)
-X set IDE xfer mode (DANGEROUS)
-y put drive in standby mode
-Y put drive to sleep
-Z disable Seagate auto-powersaving mode
-z re-read partition table
--direct use O_DIRECT to bypass page cache for timings
--Istdin read identify data from stdin as ASCII hex
--Istdout write identify data to stdout as ASCII hex
--verbose display extra diagnostics from some commands
--security-help display help for ATA security commands
--drq-hsm-error crash system with a "stuck DRQ" error (VERY DANGEROUS)
/// 속도측정
[root@localhost pub]# hdparm -tT /dev/sda1
/dev/sda1:
Timing cached reads: 6194 MB in 2.00 seconds = 3101.96 MB/sec
Timing buffered disk reads: 196 MB in 2.33 seconds = 84.09 MB/sec
[root@localhost pub]#
invalid-fileDownload: http://sourceforge.net/projects/hdparm/