getting to 4K disk blocks in ZFS

[Lyndon Nerenberg]

On Oct 13, 2014, at 1:47 PM, Don Lewis <truckman at FreeBSD.org> wrote:

> Combine that with raidz and now the
> overhead is about 40%.  Ouch!

But ~33 of that 40% is generic RAID overhead, and has nothing to do with the 4K block size issue.  (I.e., you would have 33% hit even if you were running UFS on a three disk RAID5.)

On any real-world system where you're running ZFS, it's unlikely the 4K block overhead is really going to be an issue.  And the underlying disk hardware is moving to 4K physical sectors, anyway.  Sooner or later you're just going to have to suck it up.

--lyndon

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