upgrade stable/12 -> stable/13 zfs + boot partition Mediasize 64K

[Warner Losh]

512kB is what I recommend. ~540k (not 640k) is the limit

Warner

On Thu, Feb 11, 2021, 5:44 PM Freddie Cash <fjwcash at gmail.com> wrote:

> Sorry, meant 256 KB or 512 KB, not MB!
>
> On Thu, Feb 11, 2021 at 4:43 PM Freddie Cash <fjwcash at gmail.com> wrote:
>
> > On Thu, Feb 11, 2021 at 4:35 PM Russell L. Carter <rcarter at pinyon.org>
> > 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.
> >>
> >> That is laughably small and you need to enter the 21st century.  ;)
> >
> > I believe the recommendation is 256 MB or even 512 MB these days.
> >
> > If you partitioned your disks using "-a 1M" with gpart(8) for the
> > freebsd-zfs partition, then you'll have some slack space between it and
> the
> > freebsd-boot partition. Just delete the freebsd-boot partition and
> create a
> > larger one in it's place.  I did something similar with some drives that
> > were part of a separate storage pool that I wanted to make bootable, by
> > creating a freebsd-boot partition in the slack space before the
> freebsd-zfs
> > partition.
> >
> > If you don't have that slack space at the front, you will need to detach
> > one of the drives from the mirror, re-partition it, then attach it back
> to
> > the mirror.  Rinse and repeat for the other side.  ZFS shouldn't notice
> the
> > pool is smaller by 1 MB (there's some internal slack space to allow you
> to
> > add drives that are labelled as the same size, but actually have
> different
> > numbers of sectors).
> >
> > Cheers,
> > Freddie
> >
>
>
> --
> Freddie Cash
> fjwcash at gmail.com
> _______________________________________________
> freebsd-current at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe at freebsd.org"
>