Need help with SATA disk timing out in 8.1 Beta

Adam Vande More amvandemore at
Sun Jun 20 01:18:53 UTC 2010

On Fri, Jun 18, 2010 at 12:11 AM, Jerry Bell <jerry at> wrote:

> I am having all sorts of problems with drives in a new server.
> I have a 450G sata drive that hold my root partition, works great, no
> issues.
> I have a second, 1TB drive that has been all sorts of trouble.  When
> writing to this disk, I occasionally see errors like this:
> Jun 17 07:40:36 www3 kernel: ad8: WARNING - WRITE_DMA48 UDMA ICRC error
> (retrying request) LBA=1564898207
> <snip>
> I am at the end of my ability to troubleshoot this.  Could this be a
> problem with FreeBSD 8.1 beta and not the drives after all?
> I have seen a reference to a patch for previous versions that increase the
> DMA timeout time to 10 or 15 seconds, which fixes problems, but I am not
> certain that would fix my particular issue.

You could use ahci which might workaround the issue and give you better

load it from /boot/loader.conf

beware it will change names of detected devices, you may want to consider
using glabel.

Adam Vande More

More information about the freebsd-questions mailing list