Compex Systems Advanced SerialRAID Adapters SA33-3285-02 - Manual (Page 219)

Split Systems
The system can become split because communications have failed between the two
systems.
System 1 Split from System 2: Figure 32 shows system 1 split from system 2.
On system 1, the array is in the Exposed or the Degraded state. On system 2, the array
is in the Offline state, and SRN 48750 is generated. The array remains in the Offline
state on system 2 until:
v The two systems are reconnected.
v The Split Array Resolution flag is set to Secondary.
Attention: You must set the Split Array Resolution flag to Secondary on both
halves of the array if you need access from system 2. This action ensures that write
operations can be performed only on the secondary half of the array. If data had
been allowed to be written to both halves of the array, the data would become
unsynchronized. If the two halves are later reconnected, and the Split Array
Resolution flag is set differently on the primary and secondary side, the array enters
the Offline state to both systems.
Split Array Resolution
= Primary
System 1
SSA Adapter
System 2
SSA Adapter
Secondary 1
Secondary 2
Primary 1
Primary 2
Split Array Resolution
= Primary
Figure 32. System 1 Split from System 2
Chapter 8. Split-Site Management 199