HP 3PAR Remote Copy Software - Manual (Page 42)

2.26 Remote Copy Operation
Remote Copy User’s Guide InForm OS Version 2.3.1
Figure 2-15. Snapshot Creation Prior to Resynchronization (Asynchronous Periodic)
After the system has successfully created all snapshots, the synchronization process can begin.
The synchronizations are done individually for each volume. If the primary volume has never
been synchronized (or if no valid resynchronization snapshot exists), the system performs a full
synchronization. In a full synchronization, all data on the snapshot is transmitted to the
backup volume. After the synchronization is complete, the active snapshot is saved in order to
perform a fast resynchronization at a later point in time ( Figure 2-16 ).
Figure 2-16. Full Synchronization Using Snapshots of Primary Volumes (Asynchronous Periodic)
New writes blocked on Primary
Primary
Storage Server
2
3
Snapshots created
for all Volumes in
4
I/O allowed to resume on Primary Group
1
Snapshots Created
For All Volumes
Backup
Storage Server
Primary
Snapshots
Volume Group
Secondary
Volume Group
Snapshots
the Primary Group
in Secondary Group
Primary
Storage Server
Primary
Snapshots
Volume Group
Backup
Storage Server
Secondary
Volume Group
Complete data for each volume
copied over individually
from the snapshot to the
corresponding Secondary Volume
Host
I/O might continue
while synchronization
takes place