This bug is still present in ubuntu 19.04
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https://bugs.launchpad.net/bugs/1678112
Title:
lvm cache support lost in zesty
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I have Sandisk Backup U3. (32G). I've tested it on 4 different
computers. I had always writing speed around 3MB/s, which is slow,
because this pendrive is capable of doing 16-17MB/s writing speed. The
only way I'm able to put files faster is to use dd with bs=64 AND
oflag=direct. Using these option
I've made a typo in my previous comment: you have to specify (at least
in my case) bs=64k , not bs=64. Command line example was correct. Any
other value, bigger or smaller (32k, 128k, 256k) brings speed down back
to 3MB/s.
One more thing. I've found second pen drive which is working correctly
(ful