Dell OptiPlex 7090 Small Form Factor Setup and Specifications - Page 21

Table 14. Storage Matrix (continued) Storage M.2 PCIe solid-state Dual 2.5-inch hard drive drive Dual M.2 PCIe solid- 2.5-inch hard drive state drive Dual M.2 PCIe solid- 3.5-inch hard drive state drive M.2 Intel Optane 2.5-inch hard drive M.2 Intel Optane M.2 Intel Optane Dual 2.5-inch hard drive 3.5-inch hard drive 1st 2.5inch hard drive Y 2nd 2.5inch hard drive 1st 3.5inch hard drive Y N 2nd 3.5inch hard drive Single M.2 socket N Y Y N N Y Y N N Y N Y Y N N N Y Y Y N N Y N N N Y Y 2nd M.2 1st socket Bootable Device N M.2 solid- state drive Y 2.5-inch hard drive Y 3.5-inch hard drive N 2.5-inch hard drive N 2.5-inch hard drive N 3.5-inch hard drive Table 15. Storage specifications Storage type 2.5-inch, 5400 RPM, hard-disk drive Interface type SATA 3.0 Capacity Up to 2 TB 2.5-inch, 7200 RPM, hard-disk drive SATA 3.0 Up to 1 TB 3.5-inch,7200 RPM, hard-disk drive SATA 3.0 Up to 4 TB M.2 2230, Class 35 solid-state drive PCIe NVMe Gen3 x4 Up to 1 TB M.2 2280, Class 40 solid-state drive PCIe NVMe Gen3 x4 Up to 2 TB M.2 2280 Opal Self-Encrypting solid-state drive PCIe NVMe Gen3 x4, Class 40 Up to 1 TB RAID (Redundant Array of Independent Disks) For optimal performance when configuring drives as a RAID volume, Dell recommends drive models that are identical. NOTE: RAID is not supported on Intel Optane configurations. RAID 0 (Striped, Performance) volumes benefit from higher performance when drives are matched because the data is split across multiple drives: any I/O operations with block sizes larger than the stripe size splits the I/O and become constrained by the slowest of the drives. For RAID 0 I/O operations where block sizes are smaller than the stripe size, whichever drive the I/O operation targets determine the performance, which increases variability and results in inconsistent latencies. This variability is particularly pronounced for write operations, and it can be problematic for applications that are latency sensitive. One such example of this is any application that performs thousands of random writes per second in small block sizes. RAID 1 (Mirrored, Data Protection) volumes benefit from higher performance when drives are matched because the data is mirrored across multiple drives: all I/O operations must be performed identically to both drives, thus variations in drive performance when the models are different, results in the I/O operations completing only as fast as the slowest drive. While this does not suffer the variable latency issue in small random I/O operations as with RAID 0 across heterogeneous drives, the impact is nonetheless large because the higher performing drive becomes limited in all I/O types. One of the worst examples of constrained performance here is when using unbuffered I/O. To ensure that writes are fully committed to non-volatile regions of Specifications of OptiPlex 7090 Small Form Factor 21