On 2/24/21 20:48, Chris Murphy wrote:
On Tue, Feb 23, 2021 at 2:26 PM pmkellly@xxxxxxxxxxxx
<pmkellly@xxxxxxxxxxxx> wrote:
I recall a long and detailed discussion on this list before F33 was
released concerning what disk maintenance would be required with BTRFS.
As I recall, the final word was along the lines the running Scrub and
the other BTRFS utilities wouldn't be necessary since it was being set
up so maintenance shouldn't be needed.
Correct. Most of the time, for most users, what's provided is self
maintaining in Brfs kernel code. If there's necessary maintenance not
provided by the kernel, then it should be scheduled, e.g. a systemd
timer kicks off a service unit.
Out of curiosity I ran scrub on the four machines I have handy here. I
always do clean installs so the btrfs doesn't have a lot of time on it;
just since F33 was released.
Scrub gives no indication that it's running other than the PID. Nor does
it indicate when it's complete; so I had to monitor the PID to know when
it was done. Then I had to run:
sudo btrfs scrub status -dR /mnt
to find the results. Do you know if anyone has some code that runs scrub
and gets the status and reports it after scrub is complete?
None of the four machines showed any problem.
Running scrub and getting the status might be good for people who do
upgrade instead of doing clean installs. Maybe even a before and after
upgrade might be revealing. Perhaps a special test day for machines that
have been running the prior version for 6 months.
There was also some hesitancy to
call for running scrub because, depending on how often it's run Scrub
can be hard on SSDs (they wear out faster).
Scrub is mostly a read-only operation involving the verification of
checksums for all file system metadata and file data. There's no
concern on wear, you could run it every day if you wanted to.
I thought sure that there was one of the btrfs utilities that was hard
on SSDs if run regularly. Please refresh my memory.
But other considerations are how long it will take, how much CPU is
used, and will it slow down the computer until it completes?
Yes hence the need to know when it's done. Progress indication might be
good too. One of the machines I ran it on yesterday was an old Core Duo.
Running scrub wasn't noticeable, but the FS content is small on that
machine, the run time was seconds. On an AMD machine with 8 cores, but a
big (not huge) FS content took minutes maybe 3.
Have a Great Day!
Pat (tablepc)
_______________________________________________
test mailing list -- test@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to test-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/test@xxxxxxxxxxxxxxxxxxxxxxx
Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
