linux-kernel - Re: diskstats - sectors written, what does it mean for mmc-cards?

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Message-ID: <AANLkTikbsM8bBLJvv6-f46F02oNZ3wJWKJFJ7VTz-zJ8@mail.gmail.com>
Date:	Thu, 13 May 2010 09:32:13 +0200
From:	Clemens Eisserer <linuxhippy@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: diskstats - sectors written, what does it mean for mmc-cards?

Does really nobody know how large a mmc-sector is, reported by diskstat?

- Clemens

2010/5/12 Clemens Eisserer <linuxhippy@...il.com>:
> Hi,
>
> I have a small arm based server running enterly from an mmc-card.
> To get some glue how much the mmc-card is written to, I had a look at
> diskstat, which, after 9 days uptime, looks like:
>
>  254    0 mmcblk0 87047 34549 2851200 3081695 483009 484000 7736450
> 30472168 0 5847544 51650
>  254    1 mmcblk0p1 63356 2037674 920699 7365592
>  254    2 mmcblk0p2 58214 813270 46364 370858
>
> So, to mmcblk0 7736450 sectors have been written, and the kernel had
> to wait 5,7h for the writes to complete.
> But how can I find out how large a sector is?
>
> If I assume its 512 bytes, that would mean 3,8gb have been written to
> that card in the last few days, which seems quite a lot.
>
> Thanks, Clemens
>
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