On Sun, Apr 18, 2010 at 4:10 PM, Mark Knecht <markknecht@gmail.com> wrote:
> On Sun, Apr 18, 2010 at 3:19 PM, pk <peterk2@coolmail.se> wrote:
>> On 2010-04-18 19:43, Mark Knecht wrote:
>>
>>>> suspicion is that Linux is doing something that wakes the drive up
>>>> once every two minutes and then lets the drive go back to sleep. That
>>
>> Sounds a bit like:
>> http://lwn.net/Articles/257426/
>>
>> Although it may be different in your case...
>>
>> Best regards
>>
>> Peter K
>
> Yeah, does sound very similar. A few others have mentioned this in the
> past but I've not yet discovered what Gentoo or specifically my kernel
> config might have done to set it off.
>
> gandalf linux # date && smartctl -A /dev/sda | grep Load_Cycle_Count
> Sun Apr 18 16:08:16 PDT 2010
> 193 Load_Cycle_Count * * * *0x0032 * 187 * 187 * 000 * *Old_age
> Always * * * - * * * 41929
> gandalf linux #
>
> I'd experiment with the hdparm command but it doesn't work. Maybe
> there's somethign else I need to do first or something:
>
> gandalf linux # hdparm -B 254 /dev/sda
>
> /dev/sda:
> *setting Advanced Power Management level to 0xfe (254)
> *HDIO_DRIVE_CMD failed: Input/output error
> *HDIO_DRIVE_CMD(identify) failed: Input/output error
> gandalf linux #
>
> hdparm does work though:
>
> gandalf linux # hdparm -tT /dev/sda
>
> /dev/sda:
> *Timing cached reads: * 11552 MB in *2.00 seconds = 5779.10 MB/sec
> *Timing buffered disk reads: *314 MB in *3.00 seconds = 104.50 MB/sec
> gandalf linux #
>
> Thanks,
> Mark
>

It seems that this possibly doesn't APM...

gandalf linux # hdparm -i /dev/sda

/dev/sda:

Model=WDC WD10EARS-00Y5B1, FwRev=80.00A80, SerialNo=WD-WCAV55464493
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=50
BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=1953525168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7

* signifies the current active mode

gandalf linux #