Thunderbolt combines PCI Express and DisplayPort into a single connection, allowing for a combination of up to six peripherals, like storage devices, and monitors, to be daisy-chained together. Thunderbolt first appeared in the early 2011 MacBook Pro, but is now included on all shipping Macs.

Thunderbolt 2 is an update to the Thunderbolt specification and takes the original’s two 10 Gbps bi-directional channels and combines them into a single 20 Gbps bi-directional channel. The amount of data able to move through a Thunderbolt connection hasn’t increased, but the throughput of a single channel has been doubled. We moved the drives into a first-generation Pegasus R6 with Thunderbolt and ran the same tests. The Pegasus2 was 31 percent faster than the Pegasus in the AJA Write test and 21 percent faster in the AJA Read test.īlack Magic Disk Test Write results were similar to the AJA results, with the Pegasus2 moving data at a rate of 851 MBps, 25 percent faster than the Pegasus’s 680 MBps result. Blackmagic’s read result for the Pegasus2 was 698, 19 percent faster than the result posted by the first Pegasus.

Our 6GB large file transfer tests results were throttled by the internal drive in the MacBook Pro, with write tests topping out at 775MBps. We then reformatted the six 2TB Toshiba DT01ACA200 drives into a faster RAID 0 configuration and we ran the tests again.

With striped hard drives, the AJA 4K read test showed the Pegasus2 at 1142 MBps, 41 percent faster than the original Pegasus in RAID 0 mode. AJA read tests came in at 957 MBps, 45 percent faster than the 659 MBps that the first Pegasus posted. Blackmagic Disk tests showed 1145 MBps write speeds vs 756 MBps for the first Pegasus and 695 read speeds, a 24 percent faster than the original Pegasus drive. We didn’t have time to fully test the Pegasus2 with the new Mac Pro. PROMISE PEGASUS2 R6 DISKLESS PROĬheck back soon for more performance tests using the Mac Pro, Final Cut Pro X, and some competing drives.We use the Pegasus2 R6 on our backup server.

I've been having problems with the server for a few weeks and today finally realized that the Pegasus2 is the problem. The backup server software (Archiware PresSTORE 6) was having problems and the logs showed I/O errors on the RAID. Systems would include backup server problems when copying from the RAID to tape and frozen Finder.

Promise pegasus2 r6 diskless