For those who, like me, sometimes need a quick refresher read on linux flash, I always liked this article and its links:
http://www.ibm.com/developerworks/linux/library/l-flash-filesystems/ Cheers KG On Wed, Sep 7, 2011 at 12:52 PM, John Watlington <[email protected]> wrote: > > The classic trigger for corruption problems (especially w. SD cards) > is sudden power off events. I believe we now have the ability > to tell the EC to auto-power on the laptop, so you can just plug it > into a lamp timer set to cycle on/off every ten minutes or so > and let it run... > > When you say that the entire 11.2.0 development cycle > was done with ext4, was that released and abused extensively ? > > Cheers, > wad > > On Sep 7, 2011, at 11:06 AM, Martin Langhoff wrote: > > > A quick heads up -- we've seen Jon Nettleton hit some disk corruption > > repeatedly on his development/test machine. Diagnosis of the prob led > > us to http://dev.laptop.org/ticket/11210 (erase-blocks doesn't work > > with Toshiba eMMC devices - which is what we have on SKU 198 - > > membrane kb units) but it is unclear whether that is the issue. > > > > This is one of our current risks -- it is a concern because we need to > > know real soon whether this is a hw issue (related to the eMMC parts) > > or not. We have hit corruption issues with ext4 in the past (#9513) > > and fell back to ext3. It is not clear however that ext4 is suspect: > > the whole 11.2.0 dev cycle was done under ext4 and no disk corruption > > incidents were reported AFAIK. > > > > From IRC discussion -- he seemed to hit it while: > > - developing, compiling, > > - using an ext SD card > > - running a patched kernel and xorg > > - presumably crashing a lot > > > > We need to consider action around this > > > > - try to force the error -- I'll set up a test rig for this, applying > > unclean shutdowns on a couple of SKU198 units > > - keep our eyes open for disk corruption reports, specially in builds > > including the new gfx code > > - potentially switch back to ext3 in OOB > > > > It is very hard to prove a negative - tracking this at > > http://dev.laptop.org/ticket/11220 > > > > cheers, > > > > > > > > m > > -- > > [email protected] -- Software Architect - OLPC > > - ask interesting questions > > - don't get distracted with shiny stuff - working code first > > - http://wiki.laptop.org/go/User:Martinlanghoff > > > > _______________________________________________ > Devel mailing list > [email protected] > http://lists.laptop.org/listinfo/devel >
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