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 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 complete 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.
RAID 5 provides better performance by using data striping and protection through parity. The disadvantage of RAID 5 is that
rebuilding a large RAID 5 volume requires a longer period of time. The following are the key features of RAID 5:
●
Requires at least three drives.
● Data is available even if ones of the drives present in the volume fails. The failed drive must be replaced, and the volume
must be rebuilt for the data to be accessible.
● The total capacity is N-1, where N is the total capacity of the drives in the array. For example, if you use three 1 TB drives in
a RAID 5 array, the total volume size is 2 TB.
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 is comprised 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.
Precision 3680 Tower supports RAID with more than one hard drive configuration.
Media-card reader
The following table lists the media cards that are supported on your Precision 3680 Tower.
Table 14.
Media-card reader specifications
Description Values
Media-card type
One SD-card slot
NOTE: The SD-card reader maybe from different
manufacturers and will require specific drivers to be
installed.
Media-cards supported
● Secure Digital (SD)
● Secure Digital High Capacity (SDHC)
● Secure Digital Extended Capacity (SDXC)
NOTE: The maximum capacity supported by the media-card reader varies depending on the standard of the media card
that is installed on your computer.
Power ratings
The following table lists the power rating specifications of Precision 3680 Tower.
Table 15.
Power ratings
Description Option one Option two Option three
Type
300 W Platinum internal
power supply unit (80PLUS
Platinum Certified)
500 W Platinum internal
power supply unit (80PLUS
Platinum Certified)
1000 W Platinum internal
power supply unit (80PLUS
Platinum Certified)
Input voltage
90 VAC–264 VAC 90 VAC–264 VAC 90 VAC–264 VAC
Input frequency
47 Hz-63 Hz 47 Hz–63 Hz 47 Hz–63 Hz
Specifications of Precision 3680 Tower 23
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