upgrade stable/12 -> stable/13 zfs + boot partition Mediasize 64K
Freddie Cash
fjwcash at gmail.com
Fri Feb 12 00:44:10 UTC 2021
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
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