Intel IOMeter: Sequential Read & Write

As usual, we are going to test the drives’ ability to process streaming read and write requests. In SequentialRead and SequentialWrite patterns, IOMeter sends read and write requests (request queue depth = 4) and every half a minute changes the data block size. Thus, we get the dependence of read/write speed on the size of the requested block.

Well, unfortunately, we have to admit that WD2500JB is as slow as WD2000JB at processing 2-16KB blocks. The new WD drive also achieves its “nominal” linear read speed only on 32KB blocks.

The new WD is much better at writing. Although WD2500JB didn’t get rid of the family dislike of 1KB blocks, it is clearly better than others at processing data blocks larger than 4KB.

Overall, we haven’t seen anything extraordinary in sequential read and write tests. The higher data density of WD2500JB accounts for its higher speed when working with large data blocks. We also noticed that the new WD is better at writing than at reading.