Interesting, I will (also) look into ro root solution, thanks! Can I conclude that:
1. journaling ext4 is not as robust as me thought it was only capable of restoring limited damage 2. Yanking power is corrupting the fs, *not* the eMMC. 3. and therefor we can repair the fs by reflash the eMMC without any hardware damage done. thx, Michiel On Friday, January 23, 2015 at 4:39:28 PM UTC+1, RobertCNelson wrote: > > On Fri, Jan 23, 2015 at 9:31 AM, toni incog <toni....@gmail.com > <javascript:>> 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/ > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
