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Date: Fri, 18 Feb 2005 15:10:14 +0000
From: Colin Percival <cperciva@freebsd.org>
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To: Reid Linnemann <lreid@a.cs.okstate.edu>
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cc: freebsd-current@freebsd.org
Subject: Re: ad WRITE_DMA timing out frequently
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Reid Linnemann wrote:
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=2085599
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=2085599
>  kernel: ad0: FAILURE - WRITE_DMA timed out
> kernel: g_vfs_done():ad0s1d[WRITE(offset=52772864, length=16384)]error = 5

Looks like a dying disk.

> It seems to me that a sector on the disk might be dead in the ad0s1d
> slice (/var), but I want to be certain before I take further steps that
> the behavior I'm experiencing is positively unrelated to the migration
> to 6-CURRENT.

Install sysutils/smartmontools from ports and use smartctl.  Odds are that
the drive has logged hundreds of errors by now.

Colin Percival