linux-kernel - Re: [patch 0/7] Add TRIM support for raid linear/0/1/10

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Message-ID: <4F64D493.9010404@teksavvy.com>
Date:	Sat, 17 Mar 2012 14:14:43 -0400
From:	Mark Lord <kernel@...savvy.com>
To:	Shaohua Li <shli@...nel.org>
CC:	NeilBrown <neilb@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: [patch 0/7] Add TRIM support for raid linear/0/1/10

On 12-03-13 10:47 PM, Shaohua Li wrote:
> On 3/14/12 10:24 AM, NeilBrown wrote:
>>  On Mon, 12 Mar 2012 11:04:12 +0800 Shaohua Li <shli@...ionio.com> wrote:
..
>>  Also I wonder about handling failure in RAID1.
>>  I think the code will currently treat it like a write error, and
>>  maybe record a bad block (then fail the device is writing the badblock
>>  record fails). Is that what were want?
> Mainly to simplify the code. And I thought a normal discard should not fail.
> If it fails, something is wrong, marked it as badblock maybe not bad.

That sounds like a VERY bad idea.
Failures happen for lots of reasons,
but generic comm errors are not an excuse to suddenly mark sectors as bad.
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