swap space problems
WMC
wc_fbsd at xxiii.com
Mon May 9 11:07:41 PDT 2005
At 01:20 PM 5/9/2005, Chris Fedde wrote:
>Occasionaly my system hangs for a few seconds while loading a process
>from swap that has been idle for some time.
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=161663
What type of driver interface and controller is this? And what FBSD version?
I used to get this error when I was trying to get a SATA drive working last
summer. There were bugs in the ata driver (circa 5.2.1) that are about 96%
fixed in 5.3. It would happen under heavy disk IO doing a lot of random
seeks. The hang really is a hang, not just a delay from the swapping
activity. 40 or 50% of the time, it resulted in a "hard" full system hang
(ie: had to power cycle or hit the reset button.) Often there was severe
data corruption, also.
-Wayne
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