Toshiba HK4R Enterprise SSD Review (1920GB)


To measure 8KB random read/write performance do the same preconditioning as we did for 4KB performance. The drive is first secure erased to get it in a clean state. Next, the drive is filled by sequentially writing to the RAW NAND capacity twice. We then precondition the drive with 8KB random writes at QD256 until the drive is in a steady state. Finally, we cycle through QD1-256 for 5 minutes each for writes and then reads. All this is scripted to run with no breaks in between. The last hour of preconditioning, the average IOPS, and average latency for each QD is graphed below.

Toshiba HK4R 2TB 8K PRE

Here we can see that the 8K results follow a slightly different pattern than that of the 4K results. Here we can see performance distribution ranges from 8-10K IOPS. Latency mainly ranges from 26-32ms.

Toshiba HK4R 2TB 8K Read IOPSToshiba HK4R 2TB 8K Read LAT

During the lower QD1-QD2 portions of this test the HK4R was beat out by the other test pool drives, but from QD4-32, it beats out the M510DC once again and is right on the tail of the PM863.

Toshiba HK4R 2TB 8K WRITE IOPS Toshiba HK4R 2TB 8K WRITE Lat

Writes prove yet again to be a weak point when compared to our other test drives. It maintains an average of 9K IOPS across all QDs. Latency just passes the 3.5ms mark at QD32 as well.

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