Re: pitiful performance of an SATA150 drive

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).

I had massive problems and got rid of them that way ...

Marc


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