![]() ![]() ![]() A fio workload is set up to write sequential data to the raw drive with a block size of 128K and iodepth of 32 to cover 90% of the drive capacity. Our Sequential Writes Performance Consistency Test configures the device as a raw physical disk (after deleting configured volumes). Use of SLC caching as well as firmware caps to prevent overheating may cause drop in write speeds when a flash-based DAS device is subject to sustained sequential writes. Fortunately, such workloads are uncommon for direct-attached storage devices, where workloads are largely sequential in nature. Many benchmarks use that scheme to pre-condition devices prior to the actual testing in order to get a worst-case representative number. Worst-Case Performance Consistencyįlash-based storage devices tend to slow down in unpredictable ways when subject to a large number of small-sized random writes. We analyze each of these in detail below. ![]() The latter is also important when used with battery powered devices such as notebooks and smartphones. Power users may also be interested in performance consistency under worst-case conditions, as well as drive power consumption. We also looked at the performance consistency for these cases. The performance of the storage bridges / drives in various real-world access traces as well as synthetic workloads was brought out in the preceding sections. Miscellaneous Aspects and Concluding Remarks ![]()
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