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Date:      Fri, 1 May 2015 02:43:57 +1000
From:      Jason Birch <jbirch@jbirch.net>
Cc:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: Possible (or smart) to put freebsd-boot on USB stick for root-on-ZFS?
Message-ID:  <CAA=KUhsHQPj9erdzv3Gf4SxO0pNGE_PZH0aLfOP5k1XCmF8+Hg@mail.gmail.com>
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References:  <CAA=KUhvYfhJ9i_CU6Lhni0EB03zjPMBpBHOHLJ92THVs2owZxw@mail.gmail.com> <alpine.BSF.2.20.1503240735350.21722@wonkity.com> <CAA=KUhvNQHPsSPy9wJDrp7TJhqh2u3ZsGgykvbM5PrHB3_xbVQ@mail.gmail.com>

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>
> In my head I thought it would work okay - 1064 512B blocks is a round 133
> 4KB blocks, which these SSDs report as their stripe size. Nonetheless,
> fragmentation of the pool is off the charts...
>

That being said, I did foolishly fill this thing to 80% with a quick dump
of another FS, so it's entirely possible my math is fine and things are
aligned, and I'm just seeing pathological behaviour of a nearly-full
copy-on-write file system.



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