Martin Husemann <mar...@duskware.de> writes: On Tue, Feb 17, 2015 at 10:12:54PM +0100, Torbjörn Granlund wrote: > If I use the install-time partitioning tool and use the default MB > sizes, things certainly seem to become poorly aligned; at least the > start sector numbers are not divisible by 8 (the 8 here comes from 4096 > / 512). Having the / partition at sector 63 starts off badly... Which version are you trying to install? The netbsd-7 beta should handle this correctly. I am using a netbsd-7 from a few days ago. What exactly should netbsd-7 handle correctly?
I made some experiements. The partitioning tool step which allows changes will show 'end' as the last sector + 1. But the table in the next step have them rounded down to the expected values. I got aligned partitions to (appear to) work, except that aligning / to 64 instead of 63 caused non-boot. (I assume the boot loader use a hardwired offset.) This was a bit trickier than one would want it to be. A small mistake could cause things to be unaligned again. My final label looks good: # size offset fstype [fsize bsize cpg/sgs] a: 524225 63 4.2BSD 1024 8192 0 c: 468862065 63 unused 0 0 d: 468862128 0 unused 0 0 e: 12582912 524288 4.2BSD 2048 16384 0 f: 6291456 13107200 4.2BSD 2048 16384 0 g: 449463472 19398656 4.2BSD 4096 32768 0 Unless I am much mistaken, almost every NetBSD install on an SSD will end up aligning things very poorly, since the odd offset 63 will propagate when sizes are given in MB. I think such non-alignment hurt spinning rust too. -- Torbjörn Please encrypt, key id 0xC8601622
