On 2/11/21 7:46 PM, Dennis Clarke via freebsd-current wrote:
On 2/11/21 8:57 PM, Gary Palmer wrote:
On Thu, Feb 11, 2021 at 05:34:40PM -0700, Russell L. Carter wrote:
Greetings,
I really want to jump from stable/12 to stable/13 but one thing is
causing a hesitancy. And that is, my main raidz2 system has
a system boot zfs mirror pair that has boot partition size
(Mediasize) of 64K, and when I tried to zpool upgrade that pool a
year or 2 ago I got some scary message something like "boot
partition size is not large enough". I asked about this on the
lists but never received an answer. So, laziness required me
to ignore the problem and not zpool upgrade any of my 15 or so
zpools in the interim.
A few weeks ago I tried to make buildworld/installworld upgrade
12->13 but the boot failed in the mounting filesystems phase with it
couldn't find a bootable target. So after restoring 12 I decided
to wait a bit. In the interim I have upgraded every zpool but that
one system pool. All the other freebsd-boot partitions have a size
of 512K.
So what is the current advice? Is a freebsd-boot partition size
of 64K laughably obsolete, and I should get with the program and
repartition those disks, or can I march blindly into the upgrade?
I guess I just want to understand where these sizes are going in
the future.
Most layouts put a swap partition after the boot partition. If
that is the case for you also, if you can disable the swapping to the
swap partition you can probably increase boot and reduce swap size
pretty easily. Otherwise you're probably going to have to split
the mirror, repartition one drive, rebuild the mirror, reboot onto
that drive and then do the same to the other drive. I've done it
before on a headless system in a remote DC. With planning it's
perfectly doable. I think I built a test vm in VirtualBox and
made sure it all worked on that before trying it for real.
The process is trivial with ZFS and a mirror setup. No need to reboot.
Think of the mirror as a "left" and "right" side. If you have a three
way mirror than you are singing in the rain. Regardless just break the
mirror. Do whatever you want with the disks that are now free and clear
of the previous mirror config. Use gpart and set them up with whatever
you need. Then attach the disk(s) back onto the mirror and wait for the
thing to re-silver. Run a scrub if you want. Depends on the size. Just
know that a large amount of storage ( more than 64T ) will take a long
time to scrub and for that matter a long time to re-silver. Maybe a day.
Once everything is re-synced as a mirror just repeat the process on the
other side of the mirror. No need to reboot until you feel like testing
the whole show.
This sort of situation is also a good reason to use three way mirrors
with a hot spare pool. When possible. Makes the whole process entirely
worry free and nothing more than a cup of coffee to ponder it.
For the sake of details what does "gpart show" report?
Here you go:
root@terpsichore> gpart show
=> 34 625142381 da0 GPT (298G)
34 128 1 freebsd-boot (64K)
162 8388608 2 freebsd-swap (4.0G)
8388770 616753645 3 freebsd-zfs (294G)
=> 34 625142381 da1 GPT (298G)
34 128 1 freebsd-boot (64K)
162 8388608 2 freebsd-swap (4.0G)
8388770 616753645 3 freebsd-zfs (294G)
=> 34 5860533101 da2 GPT (2.7T)
34 6 - free - (3.0K)
40 5860533088 1 freebsd-zfs (2.7T)
5860533128 7 - free - (3.5K)
=> 40 5860533088 da3 GPT (2.7T)
40 5860533080 1 freebsd-zfs (2.7T)
5860533120 8 - free - (4.0K)
=> 40 5860533088 da4 GPT (2.7T)
40 5860533088 1 freebsd-zfs (2.7T)
=> 40 5860533088 da5 GPT (2.7T)
40 5860533088 1 freebsd-zfs (2.7T)
=> 40 5860533088 da6 GPT (2.7T)
40 5860533088 1 freebsd-zfs (2.7T)
=> 40 5860533088 da7 GPT (2.7T)
40 5860533088 1 freebsd-zfs (2.7T)
root@terpsichore>
I'm interested in any comments, if appropriate.
This now 7(!!) year old system with 6 drive replacements
over time on the raidz2, quite tiny and I guess entirely
obsolete. But it's paid for, does its job. These days
I might go with a 2 or 3 drive mirror.
Thanks,
Russell
Dennis Clarke
_______________________________________________
freebsd-current@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
_______________________________________________
freebsd-current@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
