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.
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