HP Smart Array spare drive with different size/speed

We are setting up HP servers with internal storage using different disk sizes/speeds for different virtual machines.
Are there any drawbacks to consider, if we use one global spare drive?
The spare drive would be large enough to match the bigger disks but with lower rpm than the faster ones.
An example configuration could be as follows: 2x 300Gb 15k SAS drives, 2x 600Gb 10k SAS drives, 1 global spare 600Gb 10k SAS drive.
Slower performance in the event of a 15k drive failure are not an issue, but risks of damaging disks because of different speed would be concerning.

Best regards,
Oskar Mayr
oaksboardAsked:
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StampelCommented:
The drawback will just be for performances in case your spare is used as your biggest disk will not be able to perform at 15k.
You would globally perform at 10k in this case.
For the size it does not matter as far as you make it bigger, the RAID will only use the space of the dead disk.
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