Jetez un coup d'œil à hdparm
.
Desde le manuel ( man hdparm
sur la ligne de commande) :
-S Put the drive into idle (low-power) mode, and also set the standby (spindown)
timeout for the drive. This timeout value is used by the drive to determine how
long to wait (with no disk activity) before turning off the spindle motor to save
power. Under such circumstances, the drive may take as long as 30 seconds to
respond to a subsequent disk access, though most drives are much quicker. The
encoding of the timeout value is somewhat peculiar. A value of zero means
"timeouts are disabled": the device will not automatically enter standby mode.
Values from 1 to 240 specify multiples of 5 seconds, yielding timeouts from 5
seconds to 20 minutes. Values from 241 to 251 specify from 1 to 11 units of 30
minutes, yielding timeouts from 30 minutes to 5.5 hours. A value of 252 signifies
a timeout of 21 minutes. A value of 253 sets a vendor-defined timeout period
between 8 and 12 hours, and the value 254 is reserved. 255 is interpreted as 21
minutes plus 15 seconds. Note that some older drives may have very different
interpretations of these values.
Donc :
sudo hdparm -I /dev/sdb | grep level
affichera la valeur actuelle du spindown, par exemple :
Advanced power management level: 254
D'après le manuel, 254 est réservé, donc je m'attends à ce que ce soit la valeur par défaut d'Ubuntu (quelqu'un peut-il confirmer/expliquer ce point ?).
Ejemplo: