On 2020-08-27, Andreas Menge <me...@tropos.de> wrote: > I try to wrap my head around why the FAQ > (https://www.openbsd.org/faq/faq14.html#softraidFDEkeydisk) says that one > should create a backup of the keydisk with bs=8192 and skip=1. > > From the FAQ: > > # dd bs=8192 skip=1 if=/dev/rsd1a of=backup-keydisk.img > # dd bs=8192 seek=1 if=backup-keydisk.img of=/dev/rsd1a
This copies the relevant softraid meta data. > My personal inclination was to just dd the whole disk (like dd if=/dev/rsd1c) > ... That works, but it means the disks will now share the same disklabel with the same size (even if the USB sticks differ in size), the same label, the same "unique" disk ID. That won't matter for their use as keydisk, but if you ever re-use them for something else later, you'll need to remember to recreate the disklabel or weird things may happen. -- Christian "naddy" Weisgerber na...@mips.inka.de
