zfs vs ufs performance on ssd freebsd90

M

maxstekel

Hi,

How much slower could zfs be? I have two setups with identical servers, lots of ram and lots of cpu power. Both servers have same SSD disks.

I installed the same FreeBSD 9.0 image on both servers. One on UFS and one on ZFS with 4k bounderies and ashift=12. If I serve (the same) a website from these servers, zfs is ~5 times slower. It's even slower then when I mount the same documentroot through NFS!

Iozone also shows a big difference with small files, what would really be a good test to figure out the bottleneck?

-Max.
 
Solved

The difference between the two setups was due to open_basedir being enabled on the ZFS server. This issue had nothing to do with ZFS versus UFS in particular.

I did measure a difference in performance between a ZPOOL with ashift=9 and ashift=12. (Where ashift=12 is better)

Regards,
Max.
 
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