Page 1:16-Port SAS RAID Cards Go Head-To-Head
Page 2:4x4 Ports: Multi-Lane Technology, Enclosures, Connections
Page 3: Adaptec RAID 51645
Page 4:Adaptec Storage Manager
Page 5:Areca ARC-1680ix-16
Page 6:Promise Supertrak EX 16650
Page 7:Promise RAID Tools
Page 8:Hardware Comparison Table and Test Setup
Page 9:Results: Sequential Throughput
Page 10:Results: I/O Performance RAID 0
Page 11:Results: I/O Performance RAID 5
Page 12:Results: I/O Performance RAID 6
Page 13:Power Consumption And Conclusion
Results: Sequential Throughput
Areca’s card clearly is the fastest product when it comes to simple sequential reads without pending commands. It starts off at 680 MB/s and maxes out at 820 MB/s, as soon as deeper command queues are involved. Adaptec’s maximum performance is very much the same. Promise starts at 390 MB/s and reaches 800 MB/s, but only when long command queues are involved.
There is a clear hierarchy in sequential writes for RAID 0: Areca is fastest, Adaptec is second and Promise finishes third.
With all RAID 5 member drives available, RAID 5 throughput is very much like the numbers we saw in RAID 0. However, once the controllers must rebuild array data on the fly, performance drops. Areca manages to maintain its performance level the best, while Adaptec and Promise are impacted by the missing drive.
Areca and Adaptec manage to maintain the same write performance for sequential operation on degraded arrays, while the Promise card shows a noticeable performance drop once one RAID 5 drive is missing.
RAID 6 with double redundancy is important for mission-critical systems. Again, read throughput is similar to the excellent results seen in RAID 0. Removing one drive (to simulate a failure) has only a small impact on Adaptec’s performance, but makes a larger difference for Areca and Promise. Once two drives fail, Areca manages to maintain the same performance level as with only one failed drive, while Adaptec and Promise lose still more performance.
In a RAID 6 array, sequential write performance is always the same on healthy, single, or double degraded arrays in the case of Adaptec and Areca. Unfortunately, the Promise card’s performance drops by almost 50% once one or two drives of a RAID 6 array are missing.
- 16-Port SAS RAID Cards Go Head-To-Head
- 4x4 Ports: Multi-Lane Technology, Enclosures, Connections
- Adaptec RAID 51645
- Adaptec Storage Manager
- Areca ARC-1680ix-16
- Promise Supertrak EX 16650
- Promise RAID Tools
- Hardware Comparison Table and Test Setup
- Results: Sequential Throughput
- Results: I/O Performance RAID 0
- Results: I/O Performance RAID 5
- Results: I/O Performance RAID 6
- Power Consumption And Conclusion