Latest interface: 0.3.1
Latest system: 010

3 posts

Posted on 17 May 2012 @ 15:33
Hey guys

Hope I'm welcome here with a question about ZFS/OpenIndiana combined with ESXi...

I am well aware of the fact that disks in RDM can give problems and this setup is not optimized for performance.

However, it is my first "touch" with a dedicated setup regarding ZFS (although done with 4 x 80GB SATA from an HP server at work as a POC, when I understand it all, I will build a real higher capacity array to store my data).

I have installed OpenIndiana and Napp-it on a VM with 1 vCPU and 2GB RAM, a VMDK (=bootdisk) of 10GB and the RDM's created with "vmkfstools -z" (which just means physical compatibility mode, which means maximum physical characteristics mapped to the VM).

These disks are in a RAID-Z vdev and I did the following command:

bart@OpenIndianaVirtual:/tank/test1$ dd if=/dev/zero of=zero.file bs=1M count=40960
40960+0 records in
40960+0 records out
42949672960 bytes (43 GB) copied, 3382.32 s, 12.7 MB/s

Which is... To be frankly, crappy... The disks are 7200rpm's from HP model number: FB080C4080

I haven't done any performance tuning or tweaks. Is an incompatibility between disks and the fact that I am RDM'ing them to my VM the reason for such a low performance? Or are there other things to consider and troubleshoot?

252 posts

Posted on 17 May 2012 @ 16:17
Is read speed okay? Just saw a similar complaint on another forum - turned out to be write cache disabled in BIOS.

3 posts

Posted on 18 May 2012 @ 10:40edited 13:08 42s
Well, this is something which makes me happy :) :

bart@OpenIndianaVirtual:/tank/test1$ dd if=zero.file of=/dev/null bs=1M
40960+0 records in
40960+0 records out
42949672960 bytes (43 GB) copied, 198.566 s, 216 MB/s

Vroom vroom!

I'll check my write cache setting later...

I can't find any setting related to write cache? Any idea how this option is called in BIOS? I have a SuperMicro X9SCA-F...

Screenshots BIOS:
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