Bad ZFS performance

[mgzalla]

Hi all,
is there any possibility to tweak the ZFS performance?

My system:
9.1.0.1 - Sandstorm (revision 531) x64
Intel(R) Core(TM) i5-3470T CPU @ 2.90GHz
4GB RAM
6x WD AV-GP 3TB

I tried ZFS RaidZ1 with 5 and 6 HDD and a single HDD with ZFS and my write speed is always around 65MB/s (UFS 115MB/s & SoftRaid5 115MB/s)

The CPU usage is never over 65% and memory usage between 20-25%.

Thanks

[raulfg3]

is there any possibility to tweak the ZFS performance?

YES, Install Daoyama Zfskerntune extension.

I tried ZFS RaidZ1 with 5 and 6 HDD and a single HDD with ZFS and my write speed is always around 65MB/s (UFS 115MB/s & SoftRaid5 115MB/s)

It's normal, my experience is that ZFS have allways less speed that Raid or UFS, but have other ventages and it's more secure.

but , if you tune ZFS and SAMBA, your actual throughput, may increase to 80 or 90 MB/s perhaphs 100MB/s if you spend a lot of time trying to test all posibles variables combinations ( not 115MB/s but not bad)

[lindsay]

I have 32GB memory and get about 100MB/s read and write with pretty much default settings beside the ZFS kernel tune though.
This is with CIFS/SAMBA as i havent tried yet NFS, the only thing i see is it use almost all the memory

[mgzalla]

THANKS

zfskerntune boosts my speed to 85MB/s... memory usage up to 50%

perhaps I should upgrade the memory to get another 10-20MB/s

Hint: Don't use power daemon -> power mode -> minimum with ZFS... dropped my speed to 13MB/s

[fsbruva]

Another thing to do to boost read speeds is to set up several mirrored vdevs, rather than raidz1 or z2. Read speed will increase as more drives are added to the mirror. 2 disk in the mirror, double read speed, 3 disks, triple, etc.