On 2/11/21 5:43 PM, Freddie Cash wrote:
Sorry, meant 256 KB or 512 KB, not MB!
On Thu, Feb 11, 2021 at 4:43 PM Freddie Cash <fjwc...@gmail.com> wrote:
On Thu, Feb 11, 2021 at 4:35 PM Russell L. Carter <rcar...@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
That's what I wanted to know, thanks a lot. I need to practice
replacing drives on that mirror anyway. Although I will study
carefully the partition boundaries to see if your shortcut might
work.
I'm a FreeBSD person until I die so I should to get these lower level
details nailed.
Best!
Russell
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