Exploring the Relationship Between Spare Area and Performance Consistency in SSD

@ 2012/12/04
Delivering consistent performance is an important part of improving user experience. As Intel's SSD DC S3700 and Corsair's Neutron have shown, consistent performance is possible through a controller that prioritizes efficient and aggressive defragmentation. I do believe it is important for controller vendors to prioritize IO consistency in their controller and firmware designs.

For drives on the market today that don't already prioritize consistent IO, it is possible to deliver significant improvements in IO consistency through an increase in spare area. OCZ's Vector and Samsung's SSD 840 Pro both deliver much better IO consistency if you simply set aside 25% of the total NAND capacity as spare area. Consumer SSD prices are finally low enough where we're no longer forced to buy the minimum capacity for our needs. Whatever drive you end up buying, plan on using only about 75% of its capacity if you want a good balance between performance consistency and capacity.

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