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Table 13. Storage specifications

Storage type

2.5-inch, 5400 RPM, hard-disk drive

2.5-inch, 7200 RPM, hard-disk drive

2.5-inch, 7200 RPM, Self-Encrypting,

Opal 2.0, FIPS

3.5-inch, 5400 RPM, hard-disk drive

3.5-inch, 7200 RPM, hard-disk drive

M.2 2230, SSD, Class 35

M.2 2230, SSD, Class 35, Self-

Encrypting, Opal 2.0, FIPS

M.2 2280, SSD, Class 40

M.2 2280, SSDClass 40, Self-Encrypting,

Opal 2.0, FIPS

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 IO operations with block sizes larger than the stripe size will split the IO and become constrained by

the slowest of the drives. For RAID 0 IO operations where block sizes are smaller than the stripe size, whichever drive the IO

operation targets will 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 very 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 IO operations must be performed identically to both drives, thus variations in drive

performance when the models are different, results in the IO operations completing only as fast as the slowest drive. While

this does not suffer the variable latency issue in small random IO operations as with RAID 0 across heterogeneous drives, the

impact is nonetheless large because the higher performing drive becomes limited in all IO types. One of the worst examples of

constrained performance here is when using unbuffered IO. To ensure writes are fully committed to non-volatile regions of the

RAID volume, unbuffered IO bypasses cache (for example by using the Force Unit Access bit in the NVMe protocol) and the IO

operation will not complete until all the drives in the RAID volume have completed the request to commit the data. This kind of

IO operation completely negates any advantage of a higher performing drive in the volume.

Care must be taken to match not only the drive vendor, capacity, and class, but also the specific model. Drives from the same

vendor, with the same capacity, and even within the same class, can have very different performance characteristics for certain

types of IO operations. Thus, matching by model ensures that the RAID volumes is comprised of an homogeneous array of drives

that will deliver all the benefits of a RAID volume without incurring the additional penalties when one or more drives in the

volume are lower performing.

OptiPlex 5000 Small Form Factor supports RAID with more than one hard drive configuration.

Interface type

SATA 3.0

PCIe NVMe Gen3 x4

PCIe NVMe Gen4 x4

PCIe NVMe Gen3 x4

Specifications of OptiPlex 5000 Small Form Factor

Capacity

Up to 2 TB

Up to 1 TB

500 GB

4 TB

Up to 2 TB

Up to 1 TB

256 GB

Up to 2 TB

Up to 1 TB