Is it okay to build a RAID with drives of different rotation speeds?

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Is it okay to build a RAID with drives that have different rotation speeds?

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@qnap-field

In most cases, building with drives that have different rotation speeds does not cause functional issues. However, please note that RAID performance will be limited by the drive with the lowest performance (in this case, likely the drive with the slower rotation speed).

Example:
When building RAID6 with 4 HDDs,

  1. If you have 4 drives at 250MB/s → 250MB/s x 2 = 500MB/s
  2. If you have 3 drives at 250MB/s and 1 drive at 200MB/s → 200MB/s x 2 = 400MB/s

*Since there are 2 data disks and 2 parity disks, the performance of the slowest disk x2 is a guideline for RAID performance.

I hope this is helpful.

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