The default threshold probably was 5%, and intentional. This buffer is meant to allow the root user to use & recover the system if it is nearly full. So if this file system has any system purpose and is not purely for the digital library, you probably want the 5% there.
It also allows the filesystem to have some breathing room for defragmentation as well as not fragmenting files in the first place. On Sat, Aug 19, 2017 at 9:16 PM, Adam Holt <h...@laptop.org> wrote: > ...for exactly what is unclear, on headless RPi's in remote areas > especially. Does someone know more about how this reserve disk threshold > works? Can it possibly help an untrained operator, in a highly offline > community, when SD-card-as-primary-disk hits that threshold? > > Certainly WordPress, X Windows (and no doubt others) silently fail upon > reaching this threshold, rendering the entire system useless, from the > perspective of a low-skill owner-operator (as is the most common case in > the developing world). > > So huge thanks to Tim Moody (with George Hunt's assistance) who changed > this threshold from 4% to 1% as follows: > > tune2fs -m 1 /dev/mmcblk0p2 > > As can be viewed with the "du" (disk usage) command. The challenge is > that SD-based digital libraries are Almost Always nearly full, by design, > when remote educators ask (and deserve) all the best possible materials. > Nor do we want to discourage constructionist activities that will > occasionally gobble up a bit of SD/disk! > > So More Generally: how exactly might this 4% threshold (pick your favorite > percentage, no matter) materially help remote owner-operators, not steeped > in Linux Skillz? As so many things start failing together when Raspbian SD > card "disks" reach that reserve threshold — such that most remote/offline > educators and owner-operators will simply stop using their RPi3 digital > library at that point — particularly if it's headless :( > > Suggestions from anyone?! > > *In principle a http://en.wikipedia.org/wiki/Distant_Early_Warning_Line > <http://en.wikipedia.org/wiki/Distant_Early_Warning_Line> saves lives, but > if Raspbian/Internet-in-a-Box/Etc do not have a GUI-or-similar alert to > signal approaching disk-full danger & facilitate the needed "disk" cleanup, > is this counterproductive, worst case perhaps creating a false sense of > security among implementers?* > > *(If so wasting impoverished citizens' prescious SD card funds to no > benefit, or worse giving them a false sense security around RPi reliability > alongside implementers?)* >
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