IBM ServeRAID-4 Ultra160 Series User Reference page 173

Recovering from a failover in a Microsoft Cluster Service server
After a failover occurs in a Microsoft Cluster Services server, the red drive lights in
external expansion enclosures might turn on for physical drives that are online.
There is no hardware problem; the lights turn off within an hour.
Recovering from a failed server in a ServeRAID cluster
Contact IBM technical support for assistance.
Chapter 18. Solving ServeRAID problems
155