An order of magnitude higher IOPS needed with ZFS than UFS

[Ira Cooper]

On Wed, Jun 12, 2013 at 7:40 AM, Mark Felder <feld at feld.me> wrote:

> On Tue, 11 Jun 2013 16:01:23 -0500, Attila Nagy <bra at fsn.hu> wrote:
>
>  BTW, the file systems are 77-78% full according to df (so ZFS holds more,
>> because UFS is -m 8).
>>
>
> ZFS write performance can begin to drop pretty badly when you get around
> 80% full. I've not seen any benchmarks showing an improvement with a very
> fast and large ZIL or tons of memory, but I'd expect that would help
> significantly. Just note that you're right at the edge where performance
> gets impacted.
>
>
If it matches what illumos does.  You jump off the same cliff.

-Ira