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

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Date:	Wed, 12 May 2010 17:20:22 +0200
From:	Clemens Eisserer <linuxhippy@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: diskstats - sectors written, what does it mean for mmc-cards?

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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