Linux 硬碟簡單的測速
# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 29992 MB in 1.99 seconds = 15061.91 MB/sec Timing buffered disk reads: 438 MB in 3.01 seconds = 145.69 MB/sec
這個是 SAS 15K 的速度
# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 20900 MB in 2.00 seconds = 10464.95 MB/sec Timing buffered disk reads: 896 MB in 3.00 seconds = 298.28 MB/sec
這個是 SAS 15K 兩顆做 RAID 0 的速度
# hdparm -tT /dev/md127 /dev/md127: Timing cached reads: 22506 MB in 2.00 seconds = 11269.49 MB/sec Timing buffered disk reads: 718 MB in 3.00 seconds = 239.31 MB/sec
這是 SATA 7.2K 兩顆做 RAID 0 的速度
# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 9284 MB in 2.00 seconds = 4647.05 MB/sec Timing buffered disk reads: 476 MB in 3.01 seconds = 158.34 MB/sec
這是 SSD 硬碟. 意外發現. 我好像沒有驅動好. T_T
# hdparm -I /dev/sda | grep SATA Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5 * SATA-I signaling speed (1.5Gb/s) * SATA-II signaling speed (3.0Gb/s)
理論上 SATA II 可以達到 3.0Gb/s 也就是 384 MB/s 怪哉~
# hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 11688 MB in 2.00 seconds = 5852.55 MB/sec Timing buffered disk reads: 1564 MB in 3.00 seconds = 521.01 MB/sec
這是磁碟陣列. XD
# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 25788 MB in 1.99 seconds = 12943.70 MB/sec Timing buffered disk reads: 376 MB in 3.00 seconds = 125.22 MB/sec
另外一個比較舊的磁碟陣列
# dd if=/dev/zero of=test bs=64k count=64k conv=fdatasync