To simulate the failure of a site, use the following command to detach all the devices at a specified site:

# vxdg -g diskgroup [-f] detachsite sitename

The -f option must be specified if any plexes configured on storage at the site are currently online.

After the site is detached, the application should run correctly on the available site. This step verifies that the primary site is fine. Continue the fire drill by verifying the secondary site.