On Fri, Jan 23, 2015 at 9:31 AM, toni incog <toni.in...@gmail.com> wrote:
> Sure, let's say just your latest greatest debian kernel 3.14 running
> headless doing nothing only being great?

Still missing the point..

So in that case, you have ext4, and / mounted rw with noatime..

Let's say it's idle:

It'll survive a few power yanks and fsck.ext4 will fix it up most of the time..

I'd say about a week before you'll have to reflash the eMMC to due
file system corruption...


> Any experiences with broken eMMCs? How important is using a backup battery
> in a daily unclean power down situation. What's your feeling: days, weeks,
> months, years, decades?

Really anything > then a week of unclean power down's, start looking
at "read only root"* and other file systems.

* We have a beagleboard-xm running on the roof of this building as a
webcam taking pictures all day, it's been running (off/on) for over 3
years on the same microSD card running Debian Squeeze, on a read only
rootfs.. It's powered by a solar array, so power is variable all day
long..

https://wiki.debian.org/ReadonlyRoot

>
> Hmmm, I guess I've some work to do in shutting down some bbb's properly
> otherwise I can answer my own question. Thinking aloud a battery and
> bringing the power button external.

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/

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