On Fri, Sep 19, 2025 at 1:13 PM home user via users
<[email protected]> wrote:
> What are the advantages of using sub-volumes?

Flexibility

> What are the trade-offs?

"With great power comes great responsibility."
OK - just complexity.

> Are they required or optional?

Totally optional (maybe depending on file system type?).

Here's an example.  Assume you have a system with a spare slot for a
2nd disk drive, and you have configured the 1st disk drive using LVM.
You start running out of space.  You could add the 2nd drive and
expand LVM to use the 2nd drive, and expand one or more Logical
Volumes using the additional space.

Another example.  Using something like zfs sub-volumes all share the
same space, so one sub-volume could fill the space at the expense of
the others.  But you can assign a quota to the sub-volumes to prevent
that.  And then if you later determine that a sub-volume needs more
space - and the space is available - you just increase its quota.

You will find different opinions, but generally for a single-user
desktop/laptop, sub-volumes aren't but so valuable.  Personally I use
LVM on Fedora, but I used LVM on Red Hat (and other Unixes) in the
corporate world so for me it isn't a big deal.  I use zfs on my
TrueNAS - in fact I went with TrueNAS *because* it has zfs.  Again, I
used zfs on Solaris in the corporate world, so I already knew how to
use and manage it.
-- 
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