On 03/09/13 10:45, meino.cra...@gmx.de wrote: > walt <w41...@gmail.com> [13-09-03 04:15]: >> On 09/02/2013 09:15 AM, meino.cra...@gmx.de wrote: >>> The rootfs and $HOME of my embedded system is stored >>> on a 16GB SD-card (about 5GB used, rest free). The FS >>> is ext4. >>> >>> Since the system hangs for unknown reasons several times >> Does it hang at a predictable point, like during boot, or poweroff? >> >> I know almost nothing about SD cards (yet). Do they develop bad >> blocks like other storage media? I notice fsck.ext4 has a -c flag >> to check for bad blocks. >> > No, it hangs while compiling or while updateing (eix-sync; emerge ...). > > > I did the following now: > I did a binary image backup with dd of the sdcard. > I made a backup of the all files from the bad fs with tar. > I say "YES" to fsck to fix what it found. > I made another backup of the all files from the bad fs with tar. > I md5summed both tar archives and found them identical. > > Now...is the conclusion correct, that the identical md5sum > indicate, that the fixed error of the fs only had impact to > already invalidated data? > Or whatelse could this indicate? > > Best regards, > mcc > > PS: What come mind just in this moment: > Can I ran fsck on an binary image of the fs which I made with dd somehow? > > > > >
Have you run out of inodes? - ext 4 has had very mixed success for me on solid state. Running out of inodes is a real problem for gentoo on smaller SD cards with standard settings. BillK
