ZFS-only booting on FreeBSD

Andy Tornquist andyt at afua.net
Sat Feb 19 18:40:24 UTC 2011

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On 2/18/11, Daniel Staal <DStaal at usa.net> wrote:
> I've been reading over the ZFS-only-boot instructions linked here:
> <http://wiki.freebsd.org/ZFS> (and further linked from there) and have one
> worry:
> Let's say I install a FreeBSD system using a ZFS-only filesystem into a
> box with hotswapable hard drives, configured with some redundancy.  Time
> passes, one of the drives fails, and it is replaced and rebuilt using the
> ZFS tools.  (Possibly on auto, or possibly by just doing a 'zpool
> replace'.)
> Is that box still bootable?  (It's still running, but could it *boot*?)
> Extend further: If *all* the original drives are replaced (not at the same
> time, obviously) and rebuilt/resilvered using the ZFS utilities, is the
> box still bootable?
> If not, what's the minimum needed to support booting from another disk,
> and using the ZFS filesystem for everything else?
> Daniel T. Staal
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