The GAD+UR 3DC delta resync configuration includes the following storage systems:
- Primary storage system: Contains the P-VOL, UR journal volume (JNL VOL), command device (CMD), and external volume for the quorum disk. The P-VOL and the JNL VOL are virtual volumes of DP and are assigned capacities from different DP pools.
- GAD secondary storage system: Contains the GAD S-VOL, delta UR journal volume, command device, external volume for the quorum disk, and the virtual storage machine (VSM). The GAD S-VOL must have the same virtual LDEV ID as the P-VOL. Therefore it is registered to the VSM. The GAD secondary storage system must be the same model as the primary storage system.
- UR secondary storage system: Contains the UR S-VOL, UR/delta UR shared journal volume, command device, and external volume for the quorum disk.
- External storage system: Contains the GAD quorum disk. Note: In this example the quorum disk resides in a separate external storage system. If desired, the quorum disk can reside in the UR secondary storage system.
| Primary storage system | Secondary storage system |
|---|---|
| VSP One B85 |
|
| VSP One B26 or VSP One B28 |
|