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Can I add drives to RAID 5 config - already have 4 drives

Last Modified: 2016-12-08
Currently HP server has a raid 5 setup with four drives.  Can I add drives?  There are up to 7 slots on the backplane for drives.

If so, is data loss a concern?  Would it just be better to leave it at four and keep those other 3 drives on hand as spares in case others fail?
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