From: Brad Campbell <lists2009@fnarfbargle.com>
To: Roman Mamedov <rm@romanrm.net>, NeilBrown <neilb@suse.com>
Cc: tlknv <tlknv@yandex.ru>, linux-raid@vger.kernel.org
Subject: Re: mismatch_cnt constantly goes up on ssd+hdd raid1
Date: Thu, 25 Jun 2015 13:30:25 +0800 [thread overview]
Message-ID: <558B91F1.4090709@fnarfbargle.com> (raw)
In-Reply-To: <20150625101959.23981c72@natsu>
On 25/06/15 13:19, Roman Mamedov wrote:
> Couldn't this be simply the normal observed effect of using TRIM on SSD?
> After deleting some files, the filesystem issues a discard request, it
> does nothing to the HDDs, but the content of the discared areas on SSD is no
> longer deterministic (or mostly zeroed, as mentioned in the original report).
> So there is now a mismatch between the content of HDDs and SSD, but since it
> is in the area of deleted files, it doesn't affect the system in any way.
>
I get this on a RAID10 with Intel & Samsung SSD's. One supports
deterministic after TRIM and the other doesn't. Mismatch count is always
through the roof as a result but there are no other negative effects.
next prev parent reply other threads:[~2015-06-25 5:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-14 17:13 mismatch_cnt constantly goes up on ssd+hdd raid1 tlknv
2015-06-25 1:33 ` NeilBrown
2015-06-25 5:19 ` Roman Mamedov
2015-06-25 5:30 ` Brad Campbell [this message]
2015-06-25 7:25 ` NeilBrown
2015-06-25 15:33 ` tlknv
2015-06-25 15:50 ` Roman Mamedov
2015-06-25 17:24 ` Boris T
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