Verifying spare drive, best practices

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Given this situation:
7 disks in total
RAID5 of 6 disks, and a hot spare.

mdadm show the 6 disks, but not the spare.

As a maintenance question, where one wants to periodically ensure that the hot spare is both available and good.
How should one best :
1) Verify the hot spare is still available.
2) Verify that the hot spare is healthy?

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With our best regards,

//Maurice W. Hilarius         Telephone: 01-780-456-9771/
/Hard Data Ltd.                FAX:          01-780-456-9772/
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/Edmonton, AB, Canada         http://www.harddata.com//
/     T5X 1Y3/
/

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