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, result 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 the writes are fully committed to nonvolatile
regions of the RAID volume, unbuffered I/O bypasses cache (for example by using the Force Unit Access bit in the NVMe
protocol) and the I/O operation will not be completed until all the drives in the RAID volume have completed the request to
commit the data. This kind of I/O 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 different performance characteristics for certain
types of I/O operations. Thus, matching by model ensures that the RAID volume consists of a homogeneous array of drives that
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 Micro Plus 7020 supports RAID with more than one solid-state drive configuration.
Power adapter
The following table lists the power adapter specifications of your OptiPlex Micro Plus 7020.
Table 16. Power adapter specifications
Description Option one Option two
Type
130 W AC adapter 180 W AC adapter
Connector dimensions:
External diameter
7.40 mm 7.40 mm
Internal diameter
5.10 mm 5.10 mm
Power-adapter dimensions:
Height
25 mm (0.98 in.) 30 mm (1.18 in.)
Width
76 mm (2.99 in.) 76 mm (2.99 in.)
Depth
155 mm (6.10 in.) 155 mm (6.10 in.)
Input voltage
100 VAC–240 VAC 100 VAC–240 VAC
Input frequency
50 Hz–60 Hz 50 Hz–60 Hz
Input current (maximum)
2.50 A 2.34 A
Output current (continuous)
6.70 A 9.23 A
Rated output voltage
19.50 VDC 19.50 VDC
Temperature range:
Operating
0°C to 40°C (32°F to 104°F) 0°C to 40°C (32°F to 104°F)
Storage
-40°C to 70°C (-40°F to 158°F) -40°C to 70°C (-40°F to 158°F)
CAUTION: Operating and storage temperature ranges may differ among components, so operating or storing
the device outside these ranges may impact the performance of specific components.
Specifications of OptiPlex Micro Plus 7020 21
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