Linux tools - Hdparm - (Disk management and bandwidth testing).
| F.A.Q.HDPARM - Disk management and bandwidth testing
MANAGEMENT
Power management (APM - Advanced Power Management)
Head parking frequency setting (1-255)
hdparm -B 254 /dev/sdX
Explanation:
1 - Highest level of energy management
254 - Highest I/O performance
255 - Highest I/O performance
Function useful when:
#smartctl -a /dev/sdX | grep Load_Cycle_Count
Shows a score above 200,000 or constantly hear a parking disk head
Volume management (AAM - Automatic Acoustic Management).
Disk volume settings ( (AAM) setting)[0 - 254].
hdparm -M 254 /dev/sda
Explanation:
0 - disabled (off)
128 - Most quiet and slow(quiet)
254 - Fastest and loudest (fast)
THROUGHPUT TESTS
hdparm [options] device
Quick interface throughput test (without performing actual disk reads)
# hdparm -T /dev/sda/dev/sda: Timing cached reads: 2548 MB in 2.00 seconds = 1273.66 MB/sec
A quick sequential test of disk data reading:
# hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 300 MB in 3.02 seconds = 99.21 MB/sec
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