On Wed, Jun 09, 2021 at 11:05:22AM -0700, Bart Van Assche wrote: > On 6/9/21 3:53 AM, Ric Wheeler wrote: > > Consumer devices are pushed to use the highest capacity emmc class > > devices, but they have horrible write durability. > > > > At the same time, we layer on top of these devices our normal stack - > > device mapper and ext4 or f2fs are common configurations today - which > > causes write amplification and can burn out storage even faster. I think > > it would be useful to discuss how we can minimize the write > > amplification when we need to run on these low end parts & see where the > > stack needs updating. > > > > Great background paper which inspired me to spend time tormenting emmc > > parts is: > > > > http://www.cs.unc.edu/~porter/pubs/hotos17-final29.pdf > > Without having read that paper, has zoned storage been considered? F2FS > already supports zoned block devices. I'm not aware of a better solution > to reduce write amplification for flash devices. Maybe I'm missing > something? maybe you should read the paper. " Thiscomparison demonstrates that using F2FS, a flash-friendly file sys-tem, does not mitigate the wear-out problem, except inasmuch asit inadvertently rate limitsallI/O to the device" > More information is available in this paper: > https://dl.acm.org/doi/pdf/10.1145/3458336.3465300. > > Thanks, > > Bart.
