This test simulates the workload typical of a database server.
In this IOMeter pattern we are sending requests to read and write 8KB data blocks; the request queue length is steadily changing, as is the ratio of reads to writes.
The three graphs below show you the dependence of the drives’ performance on the percentage of write requests for three load modes (1, 16, and 256 outstanding requests).
The WD1500AHFD drive is competitor-less under linear load. It’s only at high percentages of write requests that the WD740GD drives can overtake it.
Let’s see what we have at a higher load (remember the graphs from the NCQ test!)
The WD740GD are both faster than the WD1500AHFD when there are more reads than writes to be done. At high percentages of writes the WD1500AHFD is quite competitive against the WD740GD.
And now, the maximum load.
No comments are necessary here.
Except for linear load, the new Raptor X cannot compete with the previous-generation drives in such operating modes. And once again I should acknowledge the very high performance of the WD740GD-FLC0 drive. This drive seems to be set to win all of our server tests.