Fuck. I just spent several days tracking down a massive performance problem through several layers of virtualization and I/O stack. Turns out LVM decides to align PVs to an odd sector number on USB devices, which murders write performance on 512e drives. https://www.redhat.com/archives/linux-lvm/2016-November/msg00035.html …
5:15 AM - 29 Jun 2018
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