On 2022-02-08 17:28, Gordon Messmer wrote:
On 2/8/22 04:56, Peter Boy wrote:
The quote describes a situation which has gone for more of a decade
now. Since we have LVM (when got that part of the Linux kernel? kernel
2.6? 2004 or so? Don’t know exactly), no one would partition a hard
disk along file system subdirectories. You create logical volumes
instead, which can easily "changed without a reinstallation“ and space
for any logical volume "can be expanded or restricted on the fly“. The
latter even easier with „thin provisioning“.
Expanded, sure. But restricted? I don't think that's as clear for
LVM. IIRC, XFS can't be shrunk at all, and ext4 can only be shrunk
offline. Users should be able to create, destroy, or resize qgroups
online for btrfs.
I'm unclear on what you mean is easier with thin provisioning; can you
clarify that?
I may be naive here, as I use writable snapshots in LVM but not thin
provisioning specifically: my impression was that users needed to be
very careful not to allow the volume group to run out of space when
using either of these, because filesystems generally don't deal well
with the unexpected write failures that occur when LVM has no more
extents to allocate. btrfs' free space handling can be surprising to
users, and statfs() might suggest there is more space available than
there is, but it's not the sort of thing that can corrupt the filesystem
itself.
Exactly! I tried using thin provisioning once as a way to solve the
"how much in / and how much in /home" dilemna and ended up regretting
it. There is no indication of how much space is really available and
when it ran out, it was messy. At least btrfs gives you an accurate
number even if it might be a little confusing at first why / is getting
so small when you fill up /home.
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