Performance Monitor can be used to collect performance information about GAD pair volumes and the quorum disk.
The amount of a port's I/O that can be added to Performance Monitor depends on the type of the volume to which I/O is issued, or on the volume's I/O mode.
For example, when the I/O mode of both GAD volumes is Mirror (RL), each time the server writes to the P-VOL, performance data is recorded for all of the following ports and volumes:
- Primary storage system port connected to the host (Target)
- Primary storage system port connected to the secondary storage system (Initiator)
- Secondary storage system port connected to the primary storage system (RCU Target)
- P-VOL
- S-VOL
When the I/O mode of both GAD volumes is Mirror (RL), each time the server reads the P-VOL data, performance data is recorded for only the primary storage system host (Target) port and the P-VOL.