QNAP TS-559 Pro Turbo NAS
Jul 22nd, 2010 | By AnthonyUnlike JBOD and RAID 0, RAID 5 combines both speed and redundancy. A RAID 5 array stripes data and parity across each disk. Those that are concerned with data integrity have likely heard of RAID 1, mirroring. It’s generally slower as the data needs to be written onto both disks. With RAID5 you get the advantage of speed and redundancy. Total storage is the combined total number of all disks minus one as redundancy where parity is distributed over all disks in the array. RAID 5 is perhaps the cheapest way to boost hard disk performance while keeping data safe.
By design, RAID 5 arrays are slower than RAID 0 or JBOD as every write requires each disk to calculate and update parity information and the necessary overhead for redundancy. With the TS-559 Pro however, though our measured throughput was lower than either other configurations, only marginally at 117 MB/s.
When testing caching, much like with JBOD and RAID 0, we see an enormous jump in performance due to cache. Re- Writer throughput averages at 119 MB/s.
Lastly with our Reader and Re- Reader tests, our numbers were consistent with the other RAID configurations as well.
Read throughput in the RAID 5 configuration measured 81 MB/s and throughput in our Re- Reader test measured 82 MB/s.
