Re: Fault tolerance with badblocks

From: Chris Murphy <lists@colorremedies.com>
To: Edward Kuns <eddie.kuns@gmail.com>
Cc: Chris Murphy <lists@colorremedies.com>,
	Wols Lists <antlists@youngman.org.uk>,
	Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: Fault tolerance with badblocks
Date: Wed, 10 May 2017 12:09:59 -0600	[thread overview]
Message-ID: <CAJCQCtTeEwdGmeL=hBF-nPMHNBTWm2wtyM_SGKkpuW3gYez2PQ@mail.gmail.com> (raw)
In-Reply-To: <CACsGCyQGoR_9dr7aYGZn1i2VWm8KWKgi1fy2x6met=UePw2OQw@mail.gmail.com>

On Wed, May 10, 2017 at 10:44 AM, Edward Kuns <eddie.kuns@gmail.com> wrote:
> On Tue, May 9, 2017 at 10:53 PM, Chris Murphy <lists@colorremedies.com> wrote:
>> Scrubs don't happen by default.
>
> From the perspective of Linux Raid authors, that is true.  However,
> the version of Fedora I have installed on my server at home does
> weekly scrubs by default.

That is a check scrub, not a repair scrub, so it still wouldn't
obliterate "good" P & Q by default.

> This is arguably a good thing, considering
> that many people installing this OS will not proactively research the
> technologies in use holding their server together and won't know that
> there are certain maintenance activities that are essential if you
> care about your data.
>
> I'm not getting involved in the bigger discussion.  My opinion is too
> uninformed to say anything there.  I just wanted to point out that
> *from the viewpoint of some users*, scrubs *will* happen by default.
> That is all.

Absolutely, just not the kind of scrub that's being accused of
damaging assumed to be good P & Q parity.

-- 
Chris Murphy