[Bug 59695] Re: High frequency of load/unload cycles on some hard disks may shorten lifetime

Pacho Ramos pacho at condmat1.ciencias.uniovi.es
Thu Jun 26 07:53:46 UTC 2008

Is fully disabling Power Manager really needed? Wouldn't it cause some
problems related with overheat or short battery lifetime?

Seems that my hardrive is now using 128 value:
# hdparm -I /dev/sda | grep Advanced
        Advanced power management level: 128
           *    Advanced Power Management feature set
# smartctl -a /dev/sda -d ata | grep Load
193 Load_Cycle_Count        0x0032   090   090   000    Old_age   Always  -     218785
# smartctl -a /dev/sda -d ata | grep Power
  9 Power_On_Seconds        0x0032   076   076   000    Old_age   Always      -       12338h+14m+13s
 12 Power_Cycle_Count       0x0032   099   099   000    Old_age   Always       -       5498
192 Power-Off_Retract_Count 0x0032   098   098   000    Old_age   Always      -       569

218785 doesn't seem a bad value,  after reading "man hdparm":

       -B     Set Advanced Power Management feature, if the drive supports it.
              A  low  value means aggressive power management and a high value
              means better performance.  Possible settings range from values 1
              through 127 (which permit spin-down), and values 128 through 254
              (which do not permit spin-down).  The highest  degree  of  power
              management  is attained with a setting of 1, and the highest I/O
              performance with a setting of 254.  A value of 255 tells  hdparm
              to  disable  Advanced  Power  Management altogether on the drive
              (not all drives support disabling it, but most do).

Power save should still being enabled. Could it be related with me using
reiserfs instead of ext3 for / ? :-/

High frequency of load/unload cycles on some hard disks may shorten lifetime
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