Re: Can a (second) hard disc consist of only 1 extended/logical partition? Or is at least one primary necessary?

On Tue, 22 Apr 2008 17:47:07 +0000, Dances With Crows wrote:

[...]

It's not so much that GRUB *can't* understand LVM, but that LVM is
complex enough that it'd be a complete and total PITA to implement an
LVM reader in real-mode x86 code.

I didn't write "can't"; I wrote "doesn't". Please don't misunderstand
me; what I wrote wasn't a complaint. Given the number of file systems
"out there", it's not unreasonable for GRUB to require /boot be in some
very limited set of file systems even if the rest of the file systems are
from the wider set of what's available.

[...]

A layer of indirection so that, when you "portion out whenever you
wish", you don't need to worry that you've the necessary contiguous
blocks.

"It's a hell of a lot easier to resize an LV than it is to resize a
partition" in other words.

True, but the reason is that level of indirection. I think it worthy to
mention that frequently, but I'm one of those "no problem cannot be
solved by another level of indirection" people <grin>.

If you have your / on an LV, you can hook up
a new disk and *move your / to that disk while the system is running*,
which is a pretty cool thing to be able to do.

Yes? I've never tried this, and I'd have assumed that this wouldn't work
because *something* would have an open descriptor on / thus preventing
the umount of the previous /. Not so? Pretty nice.


[Sorry for the rant ...]
Yeah, what's that about? Did LVM kick you as a child or something
<laugh>?

LVM is more complicated, and nothing but Linux can understand LVM right
now. This makes it a bad idea, IMHO, to use LVM unless the box is only
running Linux, or if the other OS(es) will never need to access the
stuff on the LVs.

That's okay; I've yet to be convinced that running anything other than
Linux is a good idea nowadays. However, I'll be taking a look at Solaris
10 shortly (the last version I've used being 8), so we'll see how my
opinion evolves.

- Andrew


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