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SanDisk Ultra II 240GB SSD Review - SanDisk TLC NAND Flash takes shape

By: Chris Ramseyer | SSDs in Storage | Posted: Sep 12, 2014 5:00 pm
TweakTown Rating: 92%Manufacturer: SanDisk

Mixed Read / Write Workloads


In this series of tests, we measure mixed workload performance. We start with 100% read and then add data writes to the mix until we get to 100% writes, in 10% increments. We believe this will be the next major area SSD manufactures will address after performance consistency.


Mixed Workload Bandwidth




In our mixed IO test with sequential data, we observed the Ultra II losing a significant amount of performance when writes are included in the mix.


80% Read / 20% Write Bandwidth




With 80% reads and 20% writes, the Ultra II is the slowest drive on the charts. This test pushes the drive into steady state with 128K sequential blocks so the SLC doesn't really have a chance to kick in and increase the performance.


Mixed Workload Response Time




The random mix test is 50% reads and 50% writes and does not run in steady state. Here the SLC has a chance to work properly, and as you can see in the chart, the SLC layer really helps.

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