Intel
®
High Availability Storage User Guide
43
Incompatibility Details – If the peer controller is incompatible, this field lists the cause of the
incompatibility.
Understanding Failover Operations
A failover operation in Intel® RAID High Availability Storage is the process by which VD management
transitions from one server/controller node to the peer server/controller node. A failover operation might
result from a user-initiated (planned) actions to move an application to a different controller node so that
maintenance activities can be performed, or the failover might be unintended (unplanned), resulting from
hardware or software component failure that blocks access to the storage devices. The following figures
shows an example of a failover operation of various drive groups and VDs from Server A to Server B.
Figure 34 Before Failover from Server A to Server B
Before failover, the cluster status is as follows in terms of the management of the drive group and the
VDs:
All VDs in A-DG0 (Server A - Drive Group 0) are managed by Server A.
VD3 in B-DG0 (Server B – Drive Group 0) is managed by Server B.
The SSD Cache VD (CC-VD) in A-CC is managed by Server A and services VDs in drive group A-
DG0.
Before failover, the operating system perspective is as follows:
