rendered paste body[root@super PHP]# blockdev --getra /dev/sdc1
256
[root@super PHP]# hdparm -tT /dev/sdc1
/dev/sdc1:
Timing cached reads: 4464 MB in 2.00 seconds = 2231.22 MB/sec
Timing buffered disk reads: 436 MB in 3.01 seconds = 144.68 MB/sec
[root@super PHP]# hdparm -tT /dev/sdc1
/dev/sdc1:
Timing cached reads: 4576 MB in 2.00 seconds = 2288.35 MB/sec
Timing buffered disk reads: 432 MB in 3.00 seconds = 143.78 MB/sec
[root@super PHP]# hdparm -tT /dev/sdc1
/dev/sdc1:
Timing cached reads: 4504 MB in 2.00 seconds = 2250.09 MB/sec
Timing buffered disk reads: 436 MB in 3.01 seconds = 144.68 MB/sec
[root@super PHP]# blockdev --setra 512 /dev/sdc1
[root@super PHP]# hdparm -tT /dev/sdc1
/dev/sdc1:
Timing cached reads: 4456 MB in 2.00 seconds = 2227.22 MB/sec
Timing buffered disk reads: 436 MB in 3.01 seconds = 144.97 MB/sec
[root@super PHP]# hdparm -tT /dev/sdc1
/dev/sdc1:
Timing cached reads: 4488 MB in 2.00 seconds = 2244.34 MB/sec
Timing buffered disk reads: 436 MB in 3.00 seconds = 145.11 MB/sec
[root@super PHP]# hdparm -tT /dev/sdc1
/dev/sdc1:
Timing cached reads: 4540 MB in 2.00 seconds = 2268.08 MB/sec
Timing buffered disk reads: 436 MB in 3.00 seconds = 145.11 MB/sec