Marc Tardif writes:
> What is the FreeBSD naming convention for devices of disk slices and
> labels? Considering my system is installed on the first partition of
> /dev/wd0 (non-dedicated), these are the block-device interfaces I
> have to my disk:
>
> wd0 wd0c wd0f wd0s1 wd0s1c wd0s1f wd0s2
> wd0a wd0d wd0g wd0s1a wd0s1d wd0s1g wd0s3
> wd0b wd0e wd0h wd0s1b wd0s1e wd0s1h wd0s4
>
> Questions:
> 1. What are wd0[a-h] used for?
For wd0sN[a-h] where N is number of first slice recognized
as FreeBSD slice
> 2. If wd0s1 is my first slice, why isn't it named wd0s0?
wd0s0 == wd0
wd0s0a == wd0a
> 3. If I format wd0s2 as any type (Xenix for example),
> will /dev now contain wd0s2[a-h]?
Content of /dev is totally undependent of any hardware
and kernel conditions. Do yourself
cd /dev ; ./MAKEDEV wd0s2h
for wd0s2[a-h] entries
> Assuming /dev/wd0s2 contains a few blocks, ie /dev/wd0s1
> doesn't span to the end of disk:
> 4. If I want to use /dev/wd0s2 as a raw slice for reading
> and writing, what are the steps to follow?
You can't write several blocks near /dev/wd0s2 beginning.
Use /dev/wd0 with proper address
> 4a. Do I need to format the partition as any type? If so
> is there a recommended type (perhaps one which won't
> be recognised by the bootloader would be preferable)?
It depends on usage. And remember - kernel looks up every
slice to find FreeBSD label - even if you mark it 0 (unused)
> 4b. Should I then be using /dev/rwd0s2 or /dev/rwd0s2a
> for reading and writing (of course, this is assuming
> block i/o of multiples of 512 bytes)?
You can do what you want, but remember, [a-h]
can be used only if partitino have a FreeBSD label
For example, for label on wd0s2
# some space not included in FreeBSD partition 514080 0
a: 514080 514080
b: 514080 1028160
you can use wd0s2a AND wd0s2 as different file systems IF
you properly initialise with newfs.
> Lastly, where else could I have found this information other
> than asking on the FreeBSD mailing list?
Read sources and experiment.
BE AWARE - FreeBSD 4.X in difference with FreeBSD 2.2.X is highly
unstable while experiment with labels
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