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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Manolis Kiagias <sonic2000gr@gmail.com>
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Cc: Rick Janssen <Rick.Janssen@phil.uu.nl>,
	"freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: Re: Filesystem problems at boot and shutdown?
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>>>> Nov 26 20:48:11 server kernel: ad4: WARNING - WRITE_DMA48 UDMA ICRC error
>>>> (retrying request) LBA=1364750271
>>>> Nov 26 20:48:11 server kernel: ad4: FAILURE - WRITE_DMA48
>>>> status=51<READY,DSC,ERROR> error=4<ABORTED> LBA=1364750271
>>>> Nov 26 20:48:11 server kernel:
>>>> g_vfs_done():ad4s1g[WRITE(offset=682932174848, length=131072)]error = 5


cabling problems or disk overheating (or controller) or failed disk.

ICRC error suggest that it's rather cabling problem.