OK 

The hot spares are running and ready to accept data, but are not currently being written to or read from. 

None. 

In-use 

Hot spares are currently being written to and read from. 

Diagnose how the hot spares are being used. Then repair the slice in the metadevice for which the hot spare is being used. 

Attention 

There is a problem with a hot spare or hot spare pool, but there is no immediate danger of losing data. This status is also displayed if there are no hot spares in the Hot Spare Pool, or if all the hot spares are in use or any are broken. 

Diagnose how the hot spares are being used or why they are broken. You can add more hot spares to the hot spare pool if necessary.