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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

 

sandisk_ultra_ii_240gb_ssd_review_sandisk_tlc_nand_flash_takes_shape_61

 

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

 

sandisk_ultra_ii_240gb_ssd_review_sandisk_tlc_nand_flash_takes_shape_62

 

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

 

sandisk_ultra_ii_240gb_ssd_review_sandisk_tlc_nand_flash_takes_shape_63

 

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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