On Mon, 27 Aug 2012, Kevin Oberman wrote:
No obvious problems jumped out at me. Here are my notes:
http://www.wonkity.com/~wblock/docs/html/disksetup.html
The gpart version is halfway down. I really need to switch that around.
Pretty good page, but I would really suggest that you also do either
4k or 1M alignment on your partitions. If you don't and use a disk
with 4K blocks (internally), you will have terrible performance.
You mean add the -a parameter for gpart? All that -a does is round
partition starting blocks and sizes to even values. If the numbers
given are already even multiples, it does nothing.
The reason -a4k is not shown there is because until a few months ago, -a
overrode -b. So
# gpart add -t freebsd-ufs -l gprootfs -a4k -b 1M -s 2G da0
did not start that partition at 1M, but instead at the next even 4K
block after the first 512K partition; block 1064 instead of block 2048,
AFAIR. The fix to gpart (thanks to ae@) is in 9-stable and 9.1, but not
earlier releases.
Mentioned a little farther down in the article is that keeping
additional partitions to even multiples of 1M or 1G size will keep them
in alignment.
1M is recommended by Microsoft and used by Windows, but seems a bit
excessive to me.
Also by some Sun RAID controllers and other systems. 1M is a nice even
multiple of a lot of common block sizes.
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