Date: Mon, 09 May 2005 14:07:32 -0400 From: WMC <wc_fbsd@xxiii.com> To: Chris Fedde <chris@fedde.littleton.co.us>, freebsd-questions@freebsd.org Subject: Re: swap space problems Message-ID: <6.0.1.1.2.20050509135612.028498f8@mailsvr.xxiii.com> In-Reply-To: <200505091720.j49HKHAM097093@fedde.littleton.co.us> References: <200505091720.j49HKHAM097093@fedde.littleton.co.us>
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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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