Difference between revisions of "Hdparm"
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Default value is {{ic|-B128}}. An average value could be {{ic|-B199}} if it is parking too often. | Default value is {{ic|-B128}}. An average value could be {{ic|-B199}} if it is parking too often. | ||
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| + | To make this persistent, add a [[udev]] rule by creating e.g. <code>/etc/udev/rules.d/11-sda-apm-fix.rules</code>: | ||
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| + | ACTION=="add", SUBSYSTEM=="block", KERNEL=="sda", RUN+="/sbin/hdparm -B 254 /dev/sda" | ||
==Tips and tricks== | ==Tips and tricks== | ||
Revision as of 19:52, 6 March 2013
hdparm is a performance and benchmarking tool for your hard disk (SATA/IDE).
Contents
Installation
hdparm can be installed from the official repositories. For use with SCSI devices, install sdparm.
Usage
Disk info
To get information about your hard disk, run the following:
# hdparm -I /dev/sda
Reading speed MB/s
To measure how many MB/s your hard disk (SATA/IDE) can read, run the following:
# hdparm -t --direct /dev/sda
Writing speed MB/s
To measure how many MB/s your hard disk (SATA/IDE) can write, run the following:
$ sync;time bash -c "(dd if=/dev/zero of=bf bs=8k count=500000; sync)"
Do not forget to Template:Keypress and rm bf after that.
Parking your hard drive
If your hard drive is clicking many times, the kernel is parking the hard drive's actuator arm (what moves the read/write head). This happens often on laptops (2.5" IDE hard drives). If it happens too often, it could damage your hard drive.
This will just park the reading head when you shut down the computer:
# hdparm -B254 /dev/sd
Default value is -B128. An average value could be -B199 if it is parking too often.
To make this persistent, add a udev rule by creating e.g. /etc/udev/rules.d/11-sda-apm-fix.rules:
ACTION=="add", SUBSYSTEM=="block", KERNEL=="sda", RUN+="/sbin/hdparm -B 254 /dev/sda"
Tips and tricks
KDE => 4.4.4 and hdparm
To stop KDE version 4.4.4 or greater from messing around with your (manually) configured hdparm values, enter the following and you should be done:
# touch /etc/pm/power.d/harddrive