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Thu Jul 7 10:08:42 CEST 2011

hdparm drive spindown time

# hdparm -S 100 /dev/sdg1

/dev/sdg1:
 setting standby to 100 (8 minutes + 20 seconds)


man hdparm:

       -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 turn‐
              ing  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 time‐
              out 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.



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