Re: ZFS on Linux in production?

[Les Mikesell <lesmikesell@xxxxxxxxx>]

On Mon, Nov 4, 2013 at 12:15 PM, Markus Falb <wnefal@xxxxxxxxx> wrote:
>
>> 3) NEVER let a zpool fill up above about 70% full, or the performance
>> really goes downhill.
>
> Why is it? It sounds cost intensive, if not ridiculous.
> Disk space not to used, forbidden land...
> Is the remaining 30% used by some ZFS internals?

Probably just simple physics.  If ZFS is smart enough to allocate
space 'near' other parts of the related files/directories/inodes it
will have to do worse when there aren't any good choices and it has to
fragment things into the only remaining spaces and make the disk heads
seek all over the place.   Might not be a big problem on SSD's though.

-- 
   Les Mikesell
     lesmikesell@xxxxxxxxx
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