Dell Openmanage - Global Hot Spare not showing as an option

I have a Dell server that has a RAID 5 config using the S300 array controller (inherited).  I have replaced a hard drive that failed...
there are 4 drives ttl in a RAID 5 config.
In Openmanage - I drill into the PHYSICAL DISCS section and see all 4 discs as online with an "OK" status.
I went to assign one as a global hot spare but I don't seem to have this option available to me in the AVAILABLE TASKS drop down menu....
As an FYI - before I replaced the failed drive - the failed drive WAS the global hot spare.  I unassigned it before it was replaced.  
I need to assign a global hot spare so that in the event that another drive fails.  
Why is this option not available to me and what do I need to do to have this option available to me?
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Chad FranksSenior System EngineerCommented:

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PowerEdgeTechIT ConsultantCommented:
Is your hot-spare shown under Physical Disks?  You should have the option to set a disk as a hot-spare for any disk that shows as READY.  If the disk is showing as FOREIGN, the foreign configuration must first be cleared.
datzitAuthor Commented:
thanks - hard drive size is the culprit.  Need to get different disc that matches existing drives.
Chad FranksSenior System EngineerCommented:
to expand on the previous poster.  I have seen, if the disk size is smaller than the rest, you wont see it to assign as a hotspare, since its not capable of being one.  You may also need to low level format the drive...
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