Diskmark results11/9/2023 The evaluation involves processing five different workloads: The AnandTech DAS Suite tackles the first use-case. Some users may even opt to boot an OS off an external storage device. Other usage scenarios include the use of the unit as a download or install location for games and importing files directly from it into a multimedia editing program such as Adobe Photoshop. The most common usage scenario is transfer of large amounts of photos and videos to and from the unit. Our testing methodology for storage bridges / direct-attached storage units takes into consideration the usual use-case for such devices. AnandTech DAS Suite - Benchmarking for Performance Consistency The numbers from CrystalDiskMark are more than those claimed by Samsung, but typical of similar PSSDs which tend to excel in short-duration sequential workloads. This assumes that the host port / drivers on the PC support UASP. If the numbers for the two access traces are in the same ballpark, NCQ / UASP is not supported. Comparing the '4K Q32T16' and '4K Q1T1' numbers can quickly tell us whether the storage device supports NCQ (native command queuing) / UASP (USB-attached SCSI protocol). The plain 'Rnd4K' one uses only a single queue and single thread. The 'Seq1M' traces use a 1MiB block size. The 'Seq128K Q32T1' sequential traces use 128K block size with a queue depth of 32 from a single thread, while the '4K Q32T16' one does random 4K accesses with the same queue configuration, but from multiple threads. Internally, CrystalDiskMark uses the Microsoft DiskSpd storage testing tool. Two of the traces are sequential accesses, while two are 4K random accesses. for example, uses four different access traces for reads and writes over a configurable region size. It does allow the visualization of change in transfer rates as the I/O size changes, with optimal performance being reached around 256KB for a queue depth of 4.ĬrystalDiskMark. ATTO benchmarking is restricted to a single configuration in terms of queue depth, and is only representative of a small sub-set of real-world workloads. Samsung claims read and write speeds of 1050 MBps and 1000 MBps respectively, and these are backed up by the ATTO benchmarks provided below. Synthetic Benchmarks - ATTO and CrystalDiskMark Yet another use of these synthetic benchmarks is the ability to gather information regarding support for specific storage device features that affect performance. The results translate to the instantaneous performance numbers that consumers can expect for specific workloads, but do not account for changes in behavior when the unit is subject to long-term conditioning and/or thermal throttling. Benchmarks such as ATTO and CrystalDiskMark help provide a quick look at the performance of the direct-attached storage device.
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