We configured three of the WD Red Pro drives in a RAID-5 volume in the QNAP TS-EC1279U-SAS-RP. A CIFS share in the volume was subject to some IOMeter tests with access from up to 25 VMs simultaneously. The following four graphs show the total available bandwidth and the average response time while being subject to different types of workloads through IOMeter. IOMeter also reports various other metrics of interest such as maximum response time, read and write IOPS, separate read and write bandwidth figures etc. Some of the interesting aspects from our IOMeter benchmarking run are available here.
We see that the sequential accesses are still limited by the network link, but, this time, on the NAS side. The 100% sequential reads show similar results for all the drives. However, the WD Red Pro shows the best stability under stress from multiple clients for the 50% sequential reads / 50% sequential writes test. On the other hand, the Random 8K 70% reads sequence for the WD Red Pro show better numbers compared to the WD Red, but can't compete with the numbers from the other 6 TB drives. The 60% Random / 65% Reads sequence shows the WD Red Pro in better light compared to the WD Red and the HGST Deskstar NAS, but the other drives show consistently better numbers.
They are talking about the expected number of unrecoverable read errors on a perfectly functional drive. Also, reallocated sectors occur on a write, not a read.
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Gigaplex - Monday, September 14, 2015 - link
They are talking about the expected number of unrecoverable read errors on a perfectly functional drive. Also, reallocated sectors occur on a write, not a read.xicaque - Sunday, October 23, 2016 - link
I like my NAS Reds