Date: Thu, 03 Sep 2009 19:06:05 +0200 From: Mark Stapper <stark@mapper.nl> To: Arthur Chance <freebsd@qeng-ho.org> Cc: FreeBSD-Questions <freebsd-questions@freebsd.org> Subject: Re: ZFS and DMA read error Message-ID: <4A9FF77D.6080504@mapper.nl> In-Reply-To: <4A9FCC7E.3070209@qeng-ho.org> References: <4A9B731E.9050400@mapper.nl><ade45ae90908311122s685a6aa7o6dcc49a48c08000e@mail.gmail.com> <4A9CBDBB.3060403@mapper.nl> <4F9C9299A10AE74E89EA580D14AA10A635E9C3@royal64.emp.zapto.org> <4A9F8F96.3090806@mapper.nl> <4A9FCC7E.3070209@qeng-ho.org>
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Arthur Chance wrote:
> Mark Stapper wrote:
> [snip]
>> I ordered a "spare" drive so I'll wait until it arrives, replace the
>> faulty drive with this one by dd-ing data from one to the other (I have
>> only 4 SATA ports so I can't do "zpool replace").
>
> zpool replace has two forms
>
> zpool replace pool old-device new-device
>
> and
>
> zpool replace pool device
>
> The latter is for when you pull the old drive and put the new one on
> the same {S,P}ATA port because you've no free ports. I did that a
> couple of weeks ago when one of my raidz drives fried (in its warranty
> period!) and it worked like a dream. I did a zpool replace and then a
> zpool scrub to make sure everything was OK because of this section of
> the zpool man page:
>
> Scrubbing and resilvering are very similar operations. The differ-
> ence is that resilvering only examines data that ZFS knows to be
> out of date (for example, when attaching a new device to a mirror
> or replacing an existing device), whereas scrubbing examines all
> data to discover silent errors due to hardware faults or disk fail-
> ure.
>
Thanks for the tip. I'll be sure to try that.
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