[LSF/MM/BPF TOPIC] durability vs performance for flash devices (especially embedded!)

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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





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