Re: pitiful performance of an SATA150 drive
- From: "Clayton Milos" <clay@xxxxxxxxxxx>
- Date: Tue, 27 Mar 2007 10:28:37 +0100
----- Original Message ----- From: "Marc Santhoff" <M.Santhoff@xxxxxxxxxxx>
To: "Mikhail Teterin" <mi+kde@xxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxx>
Sent: Tuesday, March 27, 2007 8:22 AM
Subject: 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
Personally, I think the SATA cables are the biggest load of rubbish ever invented. They give endless headaches, always come lose, prone to vibration and are not strong enough to support the weight of the SATA cable itself.
The ones that come with the Areca cards have clips that help a little.
They should have used a FCH connector or something like that that has been proven in the field for years instead of inventing some flimsy rubbish that isn't reliable. If you can, glue the cables on the drive side at least so that they don't give you headaches.
-Clay
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- From: Mikhail Teterin
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- From: Marc Santhoff
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