Here is how I look at this...
There are couple of potential issues with mixing different disks and
speeds - 1. reliability 2. economy
1. Reliability - The level of risk depends mainly on whether you are
using software or hardware RAID.
There is no additional risk for software RAID as long as the disks
work.
The risk for hardware RAID comes from insufficient testing and not
following your HW RAID controller
recommendations/spec. Check your RAID card manual and spec - that
should answer the risk level.
In my somewhat limited experience with couple of hundreds drives -
there is rarely speed/manufacture
requirement. It is just usual practice in the enterprise, not often
followed by the storage vendors themselves.
2. Economy - mixing fast and slow drive is waste of $$$ for the faster
drives - the RAID is only as fast as its
slowest component.
Please note that there are other reliability issues to consider beside
mixing different drives and speeds - such as are all the drives
suitable for 24/7 operations, MTTF, max spin up counts, heat, etc.
Perhaps it is one of these monkey's wisdom cases:
https://www.youtube.com/watch?v=y-PvBo75PDo
Tomas
On Tue, 2017-03-21 at 19:28 -0700, Thomas Groman wrote:
> It has become quite expensive to maintain all the same vendor and
> model
> 15K SAS drives in large raid arrays.
>
> Would using different vendor SAS drives in the same array cause any
> problems/performance degradation/reliability/ differences?
>
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