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Minimum sequential read performance dropped to 422MB/s or 3.3Gbps. That's best case sequential performance, what about worst case? To find out I wrote a single 10TB file across the entire RAID-5 array then had Iometer measure read/write performance to that file in the last 1TB of the array's capacity: Promise Pegasus R6 12TB (10TB RAID-5) Performance Obviously these are hard drives so random performance is pretty disappointing. Note that I played with higher queue depths but couldn't get beyond these numbers on the stock configuration. The best performance I saw was 683.9MB/s from our sequential write test, or 5471Mbps. I ran the test for 5 minutes, the results are below: Promise Pegasus R6 12TB (10TB RAID-5) Performance I turned to Iometer to perform a 2MB sequential access across the first 1TB of the Pegasus R6's RAID-5 array. Without a second Thunderbolt source to copy to the array at closer to the interface's max speed, we had to generate data. That's a peak of nearly 1.8Gbps and we've still got 8.2Gbps left upstream on the PCIe channel. Copying a large video file from the SSD to the Pegasus R6 over Thunderbolt proved this to be true:Īpple's SSD maxed out at 224MB/s to the Thunderbolt array, likely the peak sequential read speed from the SSD itself. But as a relatively modern 3Gbps SSD, this drive should be good for roughly 200MB/s. The model number implies a Toshiba controller and I'll get to its performance characteristics in a separate article.
PROMISE PEGASUS2 R6 REVIEW PRO
This was the first MacBook Pro I've ever tested with Apple's own SSD, so I was excited to give it a try. The problem is, there's no single drive source that can come close to delivering that sort of bandwidth.Īpple sent over a 15-inch MacBook Pro with a 256GB Apple SSD. With six in a RAID-5 configuration, we should be able to easily hit several Gbps in bandwidth to the Pegasus R6.
PROMISE PEGASUS2 R6 REVIEW SERIAL
SPECIFICATIONS Chassis: Desktop Storage: 6 x 3.5in 1TB 7,200rpm SATA2 hard disks in removable disk trays (not hot swappable) Array support: RAID 0, 1, 5, 6, 10 Network: 2 x Thundebolt Other ports: 1 x serial port Management: Promise Utility 3.16 Price per gigabyte: 18p Power consumption Idle 42W Active 50W BENCHMARKS RAID 0 Large write 590MB/s Large read 499MB/s Large average 545MB/s Small write 196.9MB/s Small read 104MB/s Small average 150.5MB/s RAID 5 Large write 482MB/s Large read 374MB/s Large average 428MB/s Small write 220MB/s Small read 111MB/s Small average 165.5MB/s RAID 6 Large write 494MB/s Large read 250MB/s Large average 372MB/s Small write 185MB/s Small read 113MB/s Small average 149MB/s RAID 10 Large write 344MB/s Large read 228MB/s Large average 286MB/s Small write 141MB/s Small read 148MB/s Small average 144.5MB/s SINGLE DISK Large write 176MB/s Large read 122MB/s Large average 149MB/s Small write 169MB/s Small read 109MB/s Small average 139MB/s RAID 0 SSD Large write 576MB/s Large read 596MB/s Large average 586MB/s Small write 209MB/s Small read 208MB/s Small average 208.A single 2TB Hitachi Deskstar 7K3000 is good for sequential transfer rates of up to ~150MB/s. However, even if you have the modern Macs required to use it, you'll need to transfer and manipulate seriously massive amounts of data regularly, such as HD or 4k video files or sprawling databases, to justify its high price. It's also very expensive, although its price per gigabyte of 18p, while high, isn't outrageously extortionate. There's no doubt that thanks to Thunderbolt, the Promise Pegasus R6 is one of the fastest storage products we have ever seen.