pitiful performance of an SATA150 drive

[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
what is the number?

Thanks,
Steve

>I had massive problems and got rid of them that way ...
>
>Marc
>
>
>_______________________________________________
>freebsd-stable at freebsd.org mailing list
>http://lists.freebsd.org/mailman/listinfo/freebsd-stable
>To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
>
>  
>


-- 

"They that give up essential liberty to obtain temporary safety, 
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty 
decreases."  (Thomas Jefferson)