Date: Wed, 30 Oct 2019 08:53:00 -0400 From: mike tancsa <mike@sentex.net> To: Victor Sudakov <vas@sibptus.ru>, freebsd-questions@freebsd.org Subject: Re: replacing zfs disk (freebsd-boot vs freebsd-efi) Message-ID: <c2bb2150-586f-cd40-ff28-ce4def01d200@sentex.net> In-Reply-To: <20191030085329.GA77044@admin.sibptus.ru> References: <5bf91c8b-a101-a174-a08b-cda42a43a0b5@sentex.net> <20191030085329.GA77044@admin.sibptus.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
On 10/30/2019 4:53 AM, Victor Sudakov wrote:
> mike tancsa wrote:
>> In the past when replacing a disk in a zfs pool that I boot from, simply
>> doing
>>
>> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ada0
>>
>> where
>> p1 = freebsd-boot
>> p2 = freebsd-swap
>> p3 = freebsd-zfs
>>
>>
>> works just fine (ie. replacing ada0). However, on this one box, I
>> noticed the disk has both freebsd-boot and efi
>>
>> p1 = efi
>> p2 = freebsd-boot
>> p3 = freebsd-swap
>> p4 = freebsd-zfs
>>
>>
>> If I replace ada0, what do I need to do in order to full restore boot
>> functionality to the disk ?
> May I suggest that if it's really a UEFI system, you probably don't need
> the freebsd-boot partition at all, nor any boot blocks or {P,M,V}BRs.
>
Thanks for the confirmation and explanation. I wonder if an added note
after a re-sliver would be a good idea
--- zpool_main.c.orig 2019-10-30 08:44:12.688304000 -0400
+++ zpool_main.c 2019-10-30 08:49:40.292540000 -0400
@@ -5856,6 +5856,8 @@
"the following command will do it:\n"
"\n"
"\tgpart bootcode -b /boot/pmbr -p /boot/gptzfsboot
-i 1 da0\n\n",
+ "\tor for EFI\n\n",
+ "\tgpart bootcode -p /boot/boot1.efifat -i 1 da0\n\n",
cb.cb_poolname);
}
> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 2 ada0
> The above ^^^^^ should be unnecessary. Your UEFI firmware will find the
> partition of the "efi" type and try to load /EFI/BOOT/BOOTX64.EFI from
> there, which in turn will sniff your ZFS filesystems for the loader.
I think FreeBSD's install added it by default. I wonder if that was done
to make the disks portable between EFI and non EFI systems ? I will have
to test to see if thats the case.
---Mike
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?c2bb2150-586f-cd40-ff28-ce4def01d200>