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Solid-state drives (SSDs) are rapidly replacing hard disk drives in enterprise data centers due to their higher throughput and reliability. However, the SSD’s random write performance is limited by the NAND flash memories within the SSD, which require garbage collection (GC). To improve the write throughput, a logical block address (LBA) scrambler has been previously proposed. However, there are two...
The required storage class memory (SCM) capacity and NAND over-provisioning (OP) for SCM/NAND hybrid enterprise solid state drive (SSD) are evaluated for various storage workloads. From the worst case simulations (hot and random data intensive workloads), it is found that less than 8% SCM/NAND capacity ratio with below 25% NAND OP is sufficient assuming SCM bit cost is 10-times as high as that of...
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