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433Administering sites and remote mirrors
To enhance read performance, VxVM will service reads from the plexes at the
local site where an application is running if the
siteread read policy is set on a
volume. Writes are written to plexes at all sites.
The site consistency of a volume is ensured by detaching a site when its last
complete plex fails at that site. If a site fails, all its plexes are detached and the
site is said to be detached.
Configurations with remote storage only are also supported as illustrated in
Figure 14-3.
Figure 14-3 Example of a two-site configuration with remote storage only
Fibre Channel
Hubs/Switches
Site A Site B
Metropolitan
Area Network Link
(such as DWDM)
Cluster or
Standalone
System
Disk
Enclosures
Disk
Enclosures