ZFS Checksum errors

[Dennis Glatting]

On Thu, 2012-06-21 at 23:04 +0100, Steven Hartland wrote:
> It could also be issues with the hardware above the raid controller, e.g. main memory.
> 
> Hardware raid check doesn't really tell you too much where as zfs checks are end to end so
> will detect intermediate issues like memory or cpu problems.
> 

Is SMART running? I found smartmontools useful in telling me of disk
troubles, such as increasing uncorrectable errors. In each case where
SMART reported this (about ten disks in the last two years), the disk
was indeed failing and on replacement the problems went away.



> We've even had a few issues in the past where the raid controller thought everything was
> fine but zfs was complaining and it did turn out to be disks on the way out.
> 
> So at this point I wouldn't rule out anything.
> 
>     Regards
>     Steve
> ----- Original Message ----- 
> From: "Rich" <rercola at pha.jhu.edu>
> To: <rondzierwa at comcast.net>
> Cc: <freebsd-fs at freebsd.org>
> Sent: Thursday, June 21, 2012 10:51 PM
> Subject: Re: ZFS Checksum errors
> 
> 
> To be honest, if ZFS says you've got a ton of checksum errors, I would
> strongly bet in favor of your data being damaged over a bug in ZFS.
> 
> What're the underlying disks and RAID card?
> 
> 
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