Date: Wed, 30 Oct 2019 15:53:29 +0700 From: Victor Sudakov <vas@sibptus.ru> To: freebsd-questions@freebsd.org Subject: Re: replacing zfs disk (freebsd-boot vs freebsd-efi) Message-ID: <20191030085329.GA77044@admin.sibptus.ru> In-Reply-To: <5bf91c8b-a101-a174-a08b-cda42a43a0b5@sentex.net>
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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.
Just make sure that the EFI (p1) partition is formatted as FAT (even
FAT16 would do) and contains the \EFI\BOOT\BOOTX64.EFI loader.
The command "gpart bootcode -p /boot/boot1.efifat -i 1 ada0"
may be a convenient way of copying the FAT partition image to the p1
partition, but certainly not the only one to format and populate it.
You could use an MS-DOS floppy as well for the purpose.
>
> 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.
man 8 uefi
--
Victor Sudakov, VAS4-RIPE, VAS47-RIPN
2:5005/49@fidonet http://vas.tomsk.ru/
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