Re: disklabel differences FreeBSD, DragonFly

* David Gilbert (dgilbert@xxxxxxx) wrote:
Dmitry> About `lack' of partitions - don't forget that labels can be
Dmitry> nested. Just do `bsdlabel -w /dev/ad0s1e` - you'll get
Dmitry> /dev/ad0s1ea.
Don't also forget that gpt(8) exists and seems to provide for large
numbers of partitions. It even seems to be compiled into GENERIC by
default.
Afaik, one is unable to boot from gpt partitions. However, I myself
didn't try it yet. Do gpt fully eliminate need in mbr/bsdlabel
partitioning? There is also issue with UFS filesystems and bsdlabel
- some filesystem data is stored in label itself:

# bsdlabel /dev/ad0s1
# size offset fstype [fsize bsize bps/cpg]
a: 262144 0 4.2BSD 2048 16384 16392
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

For example, fsck(8) makes use of it - you can

newfs /dev/ad0s1a && fsck /dev/ad0s1a

but you can't

newfs /dev/ad0 && fsck /dev/ad0

the latter will complain about unknown filesystem type and you'll
have to use fsck_ufs instead. This shouldn't affect automatic fsck
(because of fstab), but I can't guarantee that there are no any
other drawbacks.

--
Best regards,
Dmitry mailto:amdmi3@xxxxxxx
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