[ubuntu]HDDのチューニング

HDDがやたら遅い気がするのでチューニングしてみる

$ sudo su -
# sudo hdparm /dev/sda

/dev/sda:
 IO_support    =  0 (default 16-bit)
 readonly      =  0 (off)
 readahead     = 256 (on)
 geometry      = 7296/255/63, sectors = 117210240, start = 0
#  hdparm -t /dev/sda                     [~/project/dshop]

/dev/sda:
 Timing buffered disk reads:   44 MB in  3.06 seconds =  14.39 MB/sec

とりあえずreadheadだけ変えてみる

# hdparm -a1024 /dev/sda

/dev/sda:
 setting fs readahead to 1024
 readahead     = 1024 (on)
~# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads:   44 MB in  3.12 seconds =  14.08 MB/sec

ちょっと早くなった

~# hdparm -a2048 /dev/sda

/dev/sda:
 setting fs readahead to 2048
 readahead     = 2048 (on)
# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads:   42 MB in  4.05 seconds =  10.37 MB/sec

ちょっと遅くなったってことで多分1024が最適ではないかと思う