Mark Weber wrote:
On 10/14/07, Bart Samwel <[email protected]> wrote:
Some things to check:
* Run "hdparm -I" on your drive. In the "Capabilities" section there is
a line "Standby timer values", for some drives this mentions a device
specific minimum. I know some drives that ignore any setting below 60
seconds.
* I also know of quite a number of drives where hdparm -B settings
override the -S settings, even if you set the -S settings after the
hdparm -B settings. You could try combinations with various values of
hdparm -B, especially 1 and 255.
Thanks for the suggestions.
The -I command prints out a bunch of stuff including:
Standby timer values: spec'd by Standard, with device specific minimum
Ahhh. Spec'd by standard means that each -S unit is worth 5 seconds (for
values up to 240 = 20 minutes), and the second part means that there is
a minimum (which is not specified in this report, unfortunately).
Perhaps you can get a hold of the full drive manual, the exact minimum
value is probably specified there.
I tried setting -B to 1 and and then set -S to 5 minutes.
Also, -B 255 and then set -S to 5 minutes.
No luck with either. These drives want to keep running.
Just to be sure: you did use -S 60 to get 5 minutes, right?
One thing of possible interest: The -B command printed
the following message:
/dev/sda:
setting Advanced Power Management level to 0x01 (1)
HDIO_DRIVE_CMD failed: Input/output error
I would guess that the first line came out just before
hdparm tried to do the set, and the second line indicates
that the set failed.
Yes, that seems correct. Nothing too weird there: it simply seems that
the drive doesn't support the power management knob. (AFAIK you should
be able to confirm this using the feature sets listed in the output of
hdparm -I.)
Perhaps -S is failing too, just without the diagnostic?
Perhaps, but I'd expect it to print a diagnostic if it fails. I do seem
to remember that (at least for some drives that I've seen) there isn't a
diagnostic if you go below the device specific minimum, the value is
simply ignored.
Cheers,
Bart
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