Re: hdparm for lib_pata

From: Robert Hancock
Date: Sat Feb 03 2007 - 14:17:49 EST


Hi guys,

Me again, sorry.

Is it possible to make hdparm work with libata?
I have some drives that for some reason fall back to lower UDMA
settings (like UDMA/44) while the drive is UDMA/100. I blame the way I
set-up my raid arrays for this and the bus not being able to handle
all the data that goes trough it but that isnt really the case now.

Anyway, I used to be able to force the drive back with using hdparm
-X68 -d 1 /dev/sdk
But with the new lib_pata drivers I get "Inappropriate iotcl for
device" and HD_IO_DRIVE_CMD Input/Output errors.

Or! Is there some other way to force the drive not to failback to
lower UDMA settings? (Yep, I know, if this is answer, it's my risk, I
cant and wont blame you for destructing my pr0n or severe trauma I
suffer from losing data)

Only some of the hdparm functionality is supported in libata, which is partially by design. Presently there's no way to override the DMA settings in libata, it starts out at the fastest supported settings and falls back if it gets too many errors of certain types.

You shouldn't be seeing errors like this unless you have bad IDE cables or are using 40-wire cables with high UDMA modes. Can you post the output you're seeing?

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

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