Two Thunderbolt Displays with Promise Pegasus R6

I have a MBP with two pegasus r6 drives and a 27" display. I don't have audio issues but am having a flickering issue with the display when time machine backs up to the big r6. Also when I'm doing extensive video editing in FCP X. I keep project and video files on the smaller r6 and back up to the bigger r6. This is when the flickering begins as well.

I know this is the wrong thread to post this on because it's not an audio issue but this is the only thread I've found that references a display and the pegasus TB drives.

I haven't yet but will do after the weekend. I also want to check with the Genius bar to make sure they haven't seen this issue yet.

I'll reply when I've found something.

For what it's worth I'm experiencing both issues described above (audio problems and flickering).

I submitted a support request to Promise regarding the audio, they say it's a known issue and they're working on it. FWIW AnandTech also covers the issue here: http://www.anandtech.com/show/4832/the-apple-thunderbolt-display-review/10

I contacted AppleCare about the flickering, they escalated my issue to engineering but the AppleCare rep expressed doubt that it would be taken seriously because I have a "non-standard" setup (having replaced the optical drive in my MBP with an SSD). I think having more folks report the flickering issue might result in more attention being paid to it.

I am interested also about Lacie users having the same issues or not. I've got a genius bar appointment today at 4pm. I'm going to bring in the whole set up including display and pegasus drives with my MBP to try to recreate the issue for the techs at the store.

We'll see how it goes. I'll report back what I find out.

For what it's worth I received an email from Promise regarding the audio issue, they say that Apple is researching the issue.

I have not heard back from AppleCare regarding the flickering.

I am having the same issue. Just did a post about it here and on fcp.co

http://www.fcp.co/hardware-and-software/pro/715-does-thunderbolt-slow-down-when- daisy-chained-with-an-extra-display

I dont believe it is a R6 problem. I did a test. Everything works fine until you plug in the second monitor. Apparently the monitors take up around 6.9 ish gb/sec of the bandwidth each. I think this is an Apple problem. Specifically with the 17" MBP.

The oddest thing is that I also tried a 13" MBP instead of the 17" (13" has half the processing and half the ram)

The 13" works better.

Typically I get around 515mb/sec write speed on the raid. With one monitor, R6, and a Blackmagic Ultra Studio Pro I get around 460mb/sec write speed. Once the second display is added I get around 166mb/sec

On the 13" with all 4 devices plugged in I get around 225mb/sec which is enough to make the audio play correctly.

Thoughts.

I have one Thunderbolt display connected to a Pegasus R4 and experience sound corruption during writes - either copying files to the pegasus or during backup.

Additionally, the keyboard becomes unresponsive and lags a lot (usb connected) and the mouse (usb connected) stutters a lot.

Has anyone tried audio since installing yesterday's EFI firmware update? With the update installed I'm no longer able to reproduce the audio corruption on either the Thunderbolt Display internal speakers or a USB audio device while doing heavy I/O to the Pegasus R4.

Just trying updating the EFI. Definitely did not workfor me. I have dual tb displays, R6, and a Blackmagic Ultrastudio. Did a test to transfer a 20gb file to FireWire drive plugged into the display. Without fail, as always, I got audio distortion.

I really need a fix for this.

Sorry for the false hope, the audio issue resurfaced for me today. (Strange that I couldn't reproduce it Friday, try as I might, as it's usually so easy to reproduce.)

This is get ridiculous. I really am disappointed in the way that Apple and Promise have been dealing with this. It has been months with this problem. PLEASE APPLE/PROMISE FIX THIS!!!

especially as the pegasus is featured in the promo material alongside the thunderbolt display.. but they dont mention these issues which every customer seems to be experiencing not just a few.