| 1 |
Hello, |
| 2 |
|
| 3 |
On Fri, 11 May 2012, Neil Bothwick wrote: |
| 4 |
>On Thu, 10 May 2012 17:53:27 -0500, Paul Hartman wrote: |
| 5 |
>> On my HDDs, I cannot disable APM but I can disable spindown by |
| 6 |
>> changing the power-saving level to 254. I have a script in |
| 7 |
>> /etc/local.d/ which calls: |
| 8 |
> |
| 9 |
>You don't need a script, add the options you need to /etc/conf.d/hdparm |
| 10 |
>and add hdparm to the default runlevel. |
| 11 |
> |
| 12 |
>> hdparm -B 254 /dev/sd[abcdef] |
| 13 |
> |
| 14 |
>That doesn't work with my WD WD20EARX drives, which just report APM |
| 15 |
>disabled when I run it. |
| 16 |
|
| 17 |
Oh boy, we did get confused in this thread, did we? |
| 18 |
|
| 19 |
RTFM hdparm. |
| 20 |
|
| 21 |
a) Disk APM has usually only 3 settings, and only controls the |
| 22 |
"agressiveness" or the speed of how seeks are done, i.e. how fast |
| 23 |
the head moves seeking from track to track. |
| 24 |
0-127 slow |
| 25 |
128-254 fast |
| 26 |
255 default |
| 27 |
At least some manufacturers disable this (IIRC e.g. Seagate, |
| 28 |
lock it to "slow" on the "green" disks and fast on enterprise. |
| 29 |
|
| 30 |
b) spindown is a totally unrelated feature, which is can be set by |
| 31 |
using 'hdparm -S'. I have about 20 disks in two boxen, one of them |
| 32 |
a WD 20xxEARS, and _NONE_ spin down (until shutdown). |
| 33 |
|
| 34 |
Have a look into your /etc/pm-profiler/{YOUR_PROFILE} (not sure if |
| 35 |
that's gentoo standard, I only have a very minimal gentoo |
| 36 |
installed). I've e.g. copied the "Balanced Low Latency" profile but |
| 37 |
set |
| 38 |
SATA_ALPM="max_performance" |
| 39 |
In the "powersaving" you get |
| 40 |
SATA_ALPM="min_power" |
| 41 |
which sets (via hdparm -S) the disks to spindown after whatever |
| 42 |
seconds (20s? I don't know). |
| 43 |
|
| 44 |
Anyway, there is some stuff setting disk-spindown timeouts. So, choose |
| 45 |
and/or adjust pm/upower config and/or set spindown time via 'hdparm |
| 46 |
-S', with pm-profiler, upower, init-script, whatever. |
| 47 |
|
| 48 |
BTW: 'hdparm -S 0' disables spindown. |
| 49 |
|
| 50 |
HTH, |
| 51 |
-dnh, with a seriously outdated gentoo installed only in parallel, but |
| 52 |
I have a lot of disks and know hdparm a bit ;) |
| 53 |
|
| 54 |
-- |
| 55 |
When the SysAdmin answers the phone politely, say "sorry", hang up and |
| 56 |
run awaaaaay! |
| 57 |
Informal advice to users at Karolinska Institutet, 1993-1994 |
Archives