usr/lib/systemd/system-sleep/hdparm #!/bin/shĮsac Putting a drive to sleep directly after bootĪ device which is rarely needed can be put to sleep directly at the end of the boot process. Put a script into /usr/lib/systemd/system-sleep and make it executable: If the configuration is lost after system suspension/hibernation, it can be reapplied using systemd-sleep. etc/udev/rules.d/les ACTION="add|change", KERNEL="sd", ATTRS="1", RUN+="/usr/bin/hdparm -B 127 /dev/%k" Reapplying configuration after wakeup For example, to apply power-saving settings to all rotational drives (hard disk with rotational head, excluding in particular solid state drives), use the following rule: Systems with multiple hard drives can apply the rule in a flexible way according to some criteria.
#Wd power on time to fail serial#
etc/udev/rules.d/les ACTION="add", SUBSYSTEM="block", KERNEL="sda", RUN+="/usr/bin/hdparm -B 254 -S 0 /dev/sda"īecause a disk device can be assigned randomly to a changing /dev/sd X, the disk can also be identified by its serial as explained in Udev#Identifying a disk by its serial.
To make the setting persistent across reboot, one can use a udev rule: # smartctl -i -n standby /dev/sda smartctl 6.5 r4318 (local build)Ĭopyright (C) 2002-16, Bruce Allen, Christian Franke, Device is in STANDBY mode, exit(2) In this case, consider smartctl provided by smartmontools to query the device which will not wake up a sleeping disk. Invoking hdparm with the query option is known to wake-up some drives. Tips and tricks Querying the status of the disk without waking it up The device, /dev/sd X in the example, is the one you want to power off.It is also advised to wait some time so that the drive will become idle. The data was actually written to the media.The possible value depends on the disk, some disks may not support this feature. Most modern hard disk drives have the ability to speed down the head movements to reduce their noise output. Set the Automatic Acoustic Management feature.
The value of 0 disables spindown, the values from 1 to 240 specify multiples of 5 seconds and values from 241 to 251 specify multiples of 30 minutes. The timeout specifies how long to wait in idle (with no disk activity) before turning off the motor to save power. Set the standby (spindown) timeout for the drive. A value of 255 completely disables the feature. Values from 1 to 127 permit spin-down, whereas values from 128 to 254 do not. Possible values are between 1 and 255, low values mean more aggressive power management and higher values mean better performance. Set the Advanced Power Management feature. Warning: Overly aggressive power management can reduce the lifespan of hard drives due to frequent parking and spindowns.
0 kommentar(er)
