Identity Manager automates processes and reduces lost productivity. The return on investing in a highly-available Identity Manager architecture is realized by minimizing downtime and averting lost productivity.
You can use the cost of downtime to determine the amount of availability that is ultimately needed for Identity Manager. In general, a moderate investment in making Identity Manager highly-available is worthwhile.
When calculating the cost of your investment, remember that purchasing HA/FT hardware and software is only one part of implementing an available solution. Having a knowledgeable staff to keep it up and running is another cost.