[OpenIndiana-discuss] ashift 13?

[James]

On 08/04/2015 15:32, Jason Matthews wrote:

> I am going to try again with 128k. Should know something in a few hours.

Here are my test results:

Data set 1

     zfs settings     |  block size
compress  recordsize |  512     4k     ratio
----------------------------------------------
off       128k          304M    305M    1.00
on        128k          201     211     1.05
off         8k          302     312     1.03
on          8k          210     260     1.24


Data set 2

     zfs settings     |  block size
compress  recordsize |  512     4k     ratio
----------------------------------------------
off       128k          178     179     1.01
on        128k           75.3    82.1   1.09
off         8k          178     184     1.03
on          8k           84     134     1.60


I created the data quickly using tar from postgresql data files.  I used 
two zpools, both use spinning discs, one has 512 and the other 4k 
sectors. I only have small databases, the sizes are all MB as reported 
by zfs list "USED" after a sync.  compress=on is lzjb (it's "closed" 
Solaris).



James.