Hdparm/Geschwindigkeit

Geschwindigkeit

Geschwindigkeit messen

Lesegeschwindigkeit messen

Mit Cache

sudo hdparm -Tt /dev/sda
 /dev/sda:
 Timing cached reads: 6962 MB in 2.00 seconds = 3482.67 MB/sec
 Timing buffered disk reads: 358 MB in 3.01 seconds = 119.12 MB/sec

Ohne Cache

sudo hdparm -Tt --direct /dev/sda
 /dev/sda:
 Timing O_DIRECT cached reads: 498 MB in 2.00 seconds = 248.49 MB/sec
 Timing O_DIRECT disk reads: 360 MB in 3.01 seconds = 119.60 MB/sec

Read-Lookahead

Read-Lookahead-Funktion

Aktivierung bei /dev/sda

sudo hdparm -A 1 /dev/sda
 /dev/sda:
 setting drive read-lookahead to 1 (on)
 look-ahead = 1 (on)