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? More information is available in this paper: https://dl.acm.org/doi/pdf/10.1145/3458336.3465300. Thanks, Bart.
