Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 42)

First-Time RAID Configuration Using 3BM
30 3ware SAS/SATA RAID Software User Guide, Version 9.5.1
Specifying a Hot Spare
You can designate one of the Available Drives as a hot spare in 3BM. If a hot
spare is specified and a redundant unit degrades, an event notification will be
generated. If the hot spare is of the same type (SAS or SATA) and of adequate
size, it will automatically replace the failed drive without user intervention.
To specify a hot spare
1 In the list of Available Drives, highlight the drive to use.
2 Type s to specify that the selected drive will be the hot spare.
You’ll see the words “Hot Spare” appear next to the drive in the Available
Drives list.
Figure 17. Hot Spare Indicated
If a hot spare is already enabled, you can disable it by following the same
process.
Note: In order to replace a failed drive in a degraded unit, a hot spare drive
must have the same or larger storage capacity than the failed drive.