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From: "Reid Linnemann" <lreid@cs.okstate.edu>
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Date: Fri, 18 Feb 2005 09:25:05 -0600 (CST)
cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>
Subject: Re: ad WRITE_DMA timing out frequently
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On 2/18/2005, "Colin Percival" <cperciva@freebsd.org> wrote:

>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
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smartctl doesn't report any logged errors. On a hunch, I also dd'ed a
file large enough to fill /var, hoping that it would crater on writing
to that sector. It didn't. I know that's not a very useful test, but
it seems to hint to me that the disk isn't bad, but the driver is
freaking out from some event.