Date: Thu, 11 Feb 2021 16:43:40 -0800 From: Freddie Cash <fjwcash@gmail.com> To: "Russell L. Carter" <rcarter@pinyon.org> Cc: FreeBSD-Current <freebsd-current@freebsd.org> Subject: Re: upgrade stable/12 -> stable/13 zfs + boot partition Mediasize 64K Message-ID: <CAOjFWZ57V_9Q1PUCnW8LM%2BLeQzRFgpFv8k_EynE19oWDa5d-YQ@mail.gmail.com> In-Reply-To: <ccc9862a-f6f6-f0c1-abd7-fd3bdd5a481f@pinyon.org> References: <ccc9862a-f6f6-f0c1-abd7-fd3bdd5a481f@pinyon.org>
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On Thu, Feb 11, 2021 at 4:35 PM Russell L. Carter <rcarter@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
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