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

[Tormod Volden]

I have tested the 0.109-0hardy1 from hardy-proposed on a couple of
laptops. (One had a count of 300000, I had it running continuously on AC
for a couple of months. Bad.) The count is now stopped while on AC. It
increases on battery even if I have laptop_mode enabled. BTW, what it
exactly the function of point 5 in the test case? Shouldn't 6 and 7 work
without 5 anyway?

While testing all this I had a bad crash with ata errors flowing in
/proc/kmsg. I had to alt-sysrq-S-U-B and there's not much written in
kern.log. Maybe this happened because of smartctl (I was running it with
and without -d ata, and also on a WD drive over USB which didn't work),
or because I already had laptop_mode enabled and a test version of acpi-
support installed (both disabled/reverted before I did the test case
though). It happened shortly after unplugging AC and running smartctl
which hung. I hope it's only me and bad luck.

I think this is the single most important SRU I ever installed. Steve,
thanks so much for sorting this out. I hope you will attack the whole
acpi-support vs laptop-mode-tools and pm-utils interaction (mess?) while
you're at it...

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High frequency of load/unload cycles on some hard disks may shorten lifetime
https://bugs.launchpad.net/bugs/59695
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