Tracking flash IO activity?

[Brian Norris]

On Sat, May 16, 2015 at 10:41:53PM +0200, valent.turkovic at gmail.com wrote:
> I have used iostat but it is not showing any changes on /dev/mtdblock5
> which is mounted as /overlay jffs2 partition on this device I'm using.
> I have also checked stats in /proc/diskstat, and they also only change
> for /dev/mmcblk0p1 which is usb device, but not for any of
> /dev/mtdblockX partitions.

JFFS2 doesn't actually use mtdblock. At most, it uses it as a
placeholder, which tells it to actually use the corresponding /dev/mtdX
device:

http://www.linux-mtd.infradead.org/faq/jffs2.html#L_mtdblock

> > through fio and iostats , just starts an io through dd gets status through
> > iostats, i have not used but i know.

Those are all for monitoring block devices. MTDs are not block devices:

http://www.linux-mtd.infradead.org/faq/general.html#L_mtd_what

I don't know of any similar IO stats for MTDs, sorry.

Brian

> > On Sun, May 17, 2015 at 1:51 AM, valent.turkovic at gmail.com
> > <valent.turkovic at gmail.com> wrote:
> >>
> >> Hi,
> >> I'm using low cost devices like home wifi routers for few diy projects
> >> using OpenWrt.
> >>
> >> These devices use mtd partitions, but I don't have enough knowledge on
> >> how to track IO activity, especially number of writes.
> >>
> >> Can you please point me in the right direction? Thanks.
> >>
> >> ______________________________________________________
> >> Linux MTD discussion mailing list
> >> http://lists.infradead.org/mailman/listinfo/linux-mtd/
> >
> >
> 
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