Hi misc@
Inspired by http://it.slashdot.org/article.pl?sid=09/01/17/2127254 and
https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/59695 I've
looked into the hard drive load cycle count on my 5-6 months old Asus
Eee PC1000H laptop. The launchpad link recommends that a disk has no
more than ~15 load cycles per hour, which indicates that my disk might
be in danger:
$ sudo smartctl -a /dev/wd0c | grep Load_Cycle_Count
193 Load_Cycle_Count 0x0032 065 065 000 Old_age Always
- 71198
$ sudo smartctl -a /dev/wd0c | grep Power_On_Hours
9 Power_On_Hours 0x0032 100 100 000 Old_age Always
- 823
$ calc 71198/823
~86.51032806804374240583
Does anyone have some suggestions for how to tune this? I've looked in
the FAQ, smartctl(8) and atactl(8). The apmset option of atactl looks
promising, but the power management levels are not explained in enough
detail to be useful (IMHO).
If somebody can argue why I shouldn't be concerned about the load cycle
count, I'm also very interested :-)
The controller and disk in my machine:
pciide0 at pci0 dev 31 function 2 "Intel 82801GBM SATA" rev 0x02: DMA,
channel 0 wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <ST980811AS>
wd0: 16-sector PIO, LBA48, 76319MB, 156301488 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5
$ sudo smartctl -a /dev/wd0c | grep -A 11 INFO
=== START OF INFORMATION SECTION ===
Model Family: Seagate Momentus 5400.3
Device Model: ST980811AS
Serial Number: 5LYB0R9F
Firmware Version: 3.ALC
User Capacity: 80,026,361,856 bytes
Device is: In smartctl database [for details use: -P show]
ATA Version is: 7
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Sun Jan 18 16:24:14 2009 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Martin
