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ZFS results for 4 x 2TB with G8


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Hi guys,


Not sure if anybody is interested, but I thought I'd post the Bonnie++ results for my G8 with 4 drive ZFS mirror.


RAIDZ is not really an option for me - especially with big drives.



  • 4 x Hitachi 2TB 7k3000 (6Gbps)
  • Debian Wheezy
  • 2GB memory (stock)
  • G2020T (stock)
  • 16GB Sandisk extreme micro SD (OS drive)
Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
indie-g8     64000M   141  97 174318  20 141347  23   342  98 370992  21 283.3   8
Latency               112ms    1577ms    1803ms     130ms     155ms     123ms
Version  1.96       ------Sequential Create------ --------Random Create--------
indie-g8            -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
             files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                16 17959  81 +++++ +++  6147  24 18587  90 +++++ +++ 23233  90
Latency             33607us     363us    1866ms   32470us      33us      99us

From here the plan is to double the memory, but my application is sequential workload oriented, so probably won't yield much of an improvement. I will also invest in some Seagate 4TB NASworks drives, maybe even WD REs (not REDs).


So far the setup sustains playback of 8 x QuickTime Pro Res 422 streams (145Mbps each) to 2 x 10.8.5 Mac workstations. Protocol is Samba, with some tweaks on the server end. At this point I ran out of horsepower on the client side, so the G8 likely has more to give. I'm moving my testing out to a bigger lab later this week, but overall I'm really pleased with this little box... and that's using the onboard SATA without a 6Gbps HBA!


Once the fan noise with b120i is disabled is fixed, I'll be smitten.


PS. Is anybody else in the UK doing the PS1810-8G switch rebate. From what I can see when purchased with a microserver, you receive 109GBP rebate.

Edited by scruffters
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PS. This equates to something like:


Read: 370MB/s

Write: 174MB/s


This link will help for any folks unsure of how to interpret the Bonnie++ stuff:



I'm finding that the CPU is hardly bothered by ZFS, instead both smbd and Bonnie++ (when running benchmark) occupy around half of a core, which is pretty lean.


FWIW I'm looking at experimenting with a L2ARC cache using a low profile OWC PCIe mSata SSD board (either the AccelistorM or even the Accelistor E2). This should buy some IOPS for regularly requested data/meta data/small files, but I'm very unsure at this stage as to how this will stack up with large video files. The working set is quite unpredictable for video editing. Either way I believe you need 2GB memory dedicated for each 100GB of L2ARC, but most folks don't cover that fact up front!


Lastly I was missing the eSata ports a bit, but noticed the Accelistor E2 is not only Debian friendly (out of the box), it includes 2x eSATA 6Gbps ports  B)


Having a lot of fun here and its not even 8AM in the UK. haa!


PS. Here is my little test setup:


test rig

Edited by scruffters
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