From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: Brad Campbell <lists2009@fnarfbargle.com>
Cc: open list <linux-kernel@vger.kernel.org>,
linux-raid <linux-raid@vger.kernel.org>
Subject: Re: 3.12: raid-1 mismatch_cnt question
Date: Tue, 12 Nov 2013 04:14:15 -0500 [thread overview]
Message-ID: <CAO9zADwwhw9qQ7GMh45-4AXktp8UmsVOLDVVwSfc5gQS1QTENQ@mail.gmail.com> (raw)
In-Reply-To: <528178B8.4000704@fnarfbargle.com>
On Mon, Nov 11, 2013 at 7:39 PM, Brad Campbell
<lists2009@fnarfbargle.com> wrote:
> On 11/07/2013 06:54 PM, Justin Piszcz wrote:
>>
>> On Mon, Nov 4, 2013 at 5:25 AM, Justin Piszcz <jpiszcz@lucidpixels.com>
>> wrote:
>>>
>>> Hi,
>>>
>>> I run two SSDs in a RAID-1 configuration and I have a swap partition on a
>>> third SSD. Over time, the mismatch_cnt between the two devices grows
>>> higher
>>> and higher.
>>>
>
> Are both SSD's identical? Do you have discard enabled on the filesystem?
Yes (2 x Intel SSDSC2CW240A3) & yes )/dev/root on / type ext4
(rw,relatime,discard,data=ordered))
>
> The reason I ask is I have a RAID10 comprised of 3 Intel and 3 Samsung
> SSD's. The Intel return 0 after TRIM while the Samsung don't, so I _always_
> have a massive mismatch_cnt after I run fstrim. I never use a repair
> operation as it's just going to re-write the already trimmed sectors.
Very interesting and good to know!
Justin.
prev parent reply other threads:[~2013-11-12 9:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-04 10:25 3.12: raid-1 mismatch_cnt question Justin Piszcz
2013-11-07 10:54 ` Justin Piszcz
2013-11-12 0:39 ` Brad Campbell
2013-11-12 9:14 ` Justin Piszcz [this message]
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