Re: pitiful performance of an SATA150 drive

Am Dienstag, den 27.03.2007, 08:58 -0400 schrieb Stephen Clark:
Marc Santhoff wrote:

Am Montag, den 26.03.2007, 14:36 -0400 schrieb Mikhail Teterin:


Over a year later this remains a problem -- exactly as described below...

No other SATA devices are present -- the only other IDE device is the DVD
drive. My main disks are SCSI.

What's MUCH worse is that the (slowly) written data is also often corrupted...
I use the drive to store our vast collection of photos and the backups. Every
once in a while I encounter a corrupt JPEG file, and the backups are _always_
corrupt somewhere. Doing something like:

dump 0auChf 16 0 - /home | bzip2 -9 > /store/home.0.bz2

always produces a corrupt file (as per ``bzip2 -t''). I used to blame the
drive's temperature, but it now sits in its own enclosure and stays under 40
Celsius.

When the drive is accessed, there are (according to `systat -vm') many
thousands of interrupts 17 -- on my system these are shared between pcm0 and
ehci0. Why are these triggered by accessing SATA is unclear, but the Intr's
share of the CPU time is often above 80% of one processor's total (I have 4
processors).

As I mentioned a year ago, Knoppix was accessing the same drive at much higher
speeds, so I don't believe, the problem is with the hardware...

Please, advise. Thanks!



FWIW: You could try cleaning the connectors and use a fresh new cable
for the connection (the spec has a very small value for plugging the
connectors at the cable).


Are you referring to how many time the cable can be plugged in and
removed? If so

Yes, sorry for my lousy english ...

what is the number?

I don't remember the exakt count but it has only two digits. Expect 15
or 50 or so. But IIRC this was SATA 1 and may have changed with SATA 2
having a locking clip at the plug.

Marc


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