d99db1e2__Cluster_and_High_Availability__Features
[Benefits] Fencing is removing access to resources from a cluster node that has lost contact with the cluster, thereby protecting resources such as shared storage from uncoordinated modification. Red Hat has made extensive improvements in the SCSI-3 PR reservations-based fencing. By enabling manual specification of keys and devices for registration and reservation, cluster administrators can bypass clvm and improve configuration and system flexibility. After fencing, the unconnected cluster node would ordinarily need to be rebooted to safely rejoin the cluster. However, unfencing allows a node to re-enable access when starting up without administrative intervention. [Features] 
Fencing & unfencing
C l u s t e r i n g
C o n g a
C o r o s y n c
I n t e g r a t e d v i r t u a l i z a t i o n
F e n c i n g & u n f e n c i n g
I m p r o v e d c l u s t e r c o n f i g u r a t i o n s y s t e m
V i r t u a l i z a t i o n i n t e g r a t i o n
G U I
U n i f i e d l o g g i n g a n d d e b u g g i n g
Red Hat Enterprise Cluster and High Availability
Features