[Bug 208802] Install to zfs should have copies= option to provide some anti-bitrot protection

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208802

            Bug ID: 208802
           Summary: Install to zfs should have copies= option to provide
                    some anti-bitrot protection
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: conf
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: scratch65535 at att.net
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Building up a filesever with a zfs 3-way mirror for the sake of the anti-bitrot
scrubbing, I wanted to install onto zfs as well, using copies=2 (or even =3) as
a compromise between having no bitrot protection and consuming a second drive
as a mirror.  But there is no install option to do copies=.

I decided to hack the install file myself, but then couldn't squeeze everything
back into the same size iso it started with.  I've never done release
engineering, and don't have time to spend debugging things like that, so why it
wouldn't cooperate remains a mystery to me and I ended up installing to ufs as
my only practical option.

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