[Paul Joy]

The solution for me was simply the settings provided by Areca and I have attached screenshots of every page from the admin at the bottom of the page on my blog. Of course if your using different hardware it might not work for you.

https://www.pauljoy.com/2012/08/mac-pro-raid-setup/

[Paul Joy]

I posted a resolution to my problem but it’s in the wrong place in the reply list, check my blog post and see if that helps you at all.

https://www.pauljoy.com/2012/08/mac-pro-raid-setup/

[Paul Joy]

So after having the kit for a couple of days Enhance-Tech have come up with a configuration that seems to do the trick with this set up. I’ve posted a full description on my blog along with the settings that solved the problem.

https://www.pauljoy.com/2012/08/mac-pro-raid-setup/

Thanks for all the help provided

Paul

[Paul Joy]

Just to keep this updated incase anybody else is reading with the same issues, here’s where I’m at now.

After testing a second 1882x adapter and moving to an OS10.7 based Mac Pro the issue persisted. We then deleted the RAID 6 volume and created two four disk RAID 5 arrays, both were slow reads.

We then deleted the RAID 5’s and created individual pass through disks and tested each drive individually within the Enclosure and average read speeds remained much lower than expected, around 50% of the write speeds. We also tried a WD Cavair drive and that performed the same.

Upon closer inspection of the read data what was actually happening was that all the drives were constantly fluctuating between very low reads below 10 MB/s and then higher speed reads around 130MB/s resulting in the average speeds of around 60 MB/s.

The supplier of the kit has asked me to return it for further investigation, I’ll keep you updated as to what happens.

Paul.

[Paul Joy]

Hi Bob, thanks.

I thought that might be the case when installing the software so I only ticked the arcHttp and CLI installers, the original driver that came with ML is still in use.

I was told by the supplier that each cable controls four drives in the enclosure, is that not normally the case?

Regards

Paul

[Paul Joy]

Yes I’ve sent them an email, no response as yet.

How would you go about testing the individual drive performance when they are part of a RAID in an enclosure?

Thanks

[Paul Joy]

Hi Jonathan.

According to the Areca website mountain lion includes drivers for their cards and it was certainly recognised without me having to installing anything so it seems that’s true. Of course, that doesn’t mean to say that the drivers are not to blame!

https://www.areca.com.tw/news/2012/n0726_2012.html

Other than the slow build up of read speeds it seems to be reliable and working well. I’ll see if I can move it over to another machine with Lion to compare the read performance.

Many thanks

Paul.