From owner-freebsd-current@FreeBSD.ORG  Thu Oct 23 11:12:48 2014
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Date: Thu, 23 Oct 2014 04:12:46 -0700 (PDT)
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Subject: Re: ZFS: i/o error - all block copies unavailable #2
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You might want to try from the mfsbsd.iso  environment,
1. Import and mount the zpool you want to boot from
2. Copy /boot/zfs/zpool.cache to /mnt/boot/zfs/ (over-write existing
zpool.cache file)
3. Edit /mnt/boot/loader.conf and add any of these that you don't already
have:
zfs_load="YES"
opensolaris_load="YES"
vfs.root.mountfrom="zfs:zroot_name"
zpool_cache_load="YES"
zpool_cache_type="/boot/zfs/zpool.cache"
zpool_cache_name="/boot/zfs/zpool.cache"

Might be worth a try.



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FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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