LSI Megaraid alarm - clearing hotspare

Source: IBM tip H206526

There is no functional impact. To prevent the message from appearing in the system event logs:

• Open MegaRAID Storage Manager.
• Select Tools --> Monitor Configure Alerts.
• Select Change Individual Events.
• Highlight event ID 406.
• Deselect the System log check box.

I have LSI controller, RAID 10 with four disks. One disk went bad, hot-swap replace -> automatically set hot spare flag on new disk and got same warning as above. Turn machine off, physically remove replacement disk, separately did quick format to unset RAID participation, replaced disk and turned machine on. Automatically found disk and started rebuild into RAID with unset hot spare flag.

Trick seems to be finding time when machine can be shut down for cold-swap with fresh disk.