Veritas Storage Foundation Intelligent Storage Provisioning 5.0 Solutions Guide, HP-UX 11i v3, First Edition, May 2008

34 Remote mirror solutions
About Remote Mirror configurations
Figure 5-1 Example of a two-site remote mirror configuration
For applications and services to function correctly at a site when other sites
have become inaccessible, at least one complete plex of each volume must be
configured at each site (site-based allocation), and the consistency of the data in
the plexes at each site must be ensured (site consistency).
By tagging disks with site names, storage can be allocated from the correct
location when creating, resizing or relocating a volume, and when changing a
volume’s layout. Figure 5-2 shows an example of a site-consistent volume with
two plexes configured at each of two sites. The storage for plexes P1 and P2 is
allocated storage that is tagged as belonging to site A, and the storage for plexes
P3 and P4 is allocated storage that is tagged as belonging to site B.
Fibre Channel
Hubs/Switches
Site A Site B
Metropolitan or
Wide Area
Network Link
(Fibre Channel or
DWDM)
Cluster Nodes
Disk
Enclosures
Cluster Nodes
Disk
Enclosures
Private Network