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