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List:       openbsd-misc
Subject:    OpenBSD 6.7 and ffs2 FAQs
From:       Otto Moerbeek <otto () drijf ! net>
Date:       2020-05-27 20:54:59
Message-ID: 20200527205459.GM93524 () clue ! drijf ! net
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I got some questions on ffs2 in 6.7. This is to set the record
straight, feel free to share on forums like reddit that I do not read,
let alone post on.

1. Using 6.7, the *installer* defaults to ffs2 for new filesystems for
   almost all platforms.

2. Using 6.7, a newfs "by hand" still gets you ffs1, unless you use the
   -O2 flag or the partition > 1TB.

3. In -current, newfs defaults to ffs2 for all platforms.

4. ffs2 is faster than ffs2 when creating filesystems and almost always when
   fscking them.

5. ffs2 uses 64-bit timestamps and block numbers. So it handles dates
   after 2038 and much larger partitions. This does not mean that super
   large partitions are always a good idea, there are still drawbacks:
   e.g. they do need lots of memory to fsck, especially when many inodes
   are in use.

6. I have no plans for writing a conversion tool. You can convert an
   ffs1 filesystem to ffs2 using single user mode: umount; dump; newfs
   -O2; restore; mount. Or see it as an opportunity to reinstall and
  get a nice clean system without cruft collected over the years.

Hope this help in clearing up some of questions people have,

	-Otto



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