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From: "Ted Mittelstaedt" <tedm@toybox.placo.com>
To: "Richard Tobin" <richard@inf.ed.ac.uk>, <freebsd-questions@freebsd.org>
Date: Fri, 7 Sep 2007 18:52:11 -0700
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Subject: RE: Disk errors when copying
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> -----Original Message-----
> From: owner-freebsd-questions@freebsd.org
> [mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Richard Tobin
> Sent: Wednesday, September 05, 2007 3:03 PM
> To: freebsd-questions@freebsd.org
> Subject: Disk errors when copying
> 
> 
> When copy between disks (ad10 ->ad8), I get errors:
> 
> ad10: WARNING - READ_DMA48 UDMA ICRC error (retrying request) 
> LBA=435128800
> ad10: FAILURE - READ_DMA48 status=51<READY,DSC,ERROR> 
> error=10<NID_NOT_FOUND> LBA=435128800
> g_vfs_done():ad10s2g[READ(offset=175562145792, length=131072)]error = 5
> 
> I don't get these errors just reading the data from ad10.  Is this
> some kind of system error rather than a bad disk?  Is it a known problem?
> 

Yes it is a known problem.  It does not happen with most combinations
of drives and controllers.  You need to exhaustively document the
motherboard/controller/hard disk and put it into a PR and file it
so that the developer can add your combo into his database.  The more
of these that are documented the quicker that a coorelation is going
to show up and get fixed.

Ted