Cost-Effective High-Availability Solutions with HP Instant Capacity on HP-UX

Figure 4: TiCAP example before failure
Now, imagine that a failure on Sys1 incapacitates the server, forcing a move of existing workloads to
Sys2. To handle the new workload requirements on Sys2, you activate the six inactive processor
cores using TiCAP by specifying the -t option to icapmodify:
Sys2> icapmodify -a 6 -t
These cores remain active until they are deactivated. Since three units of TiCAP were originally
purchased, this is sufficient for 15 days of operation with all six cores active. You can also purchase
and apply additional TiCAP for Sys2 if needed. (If the TiCAP balance goes negative and the cores
remain active, the server will be out of compliance with the Instant Capacity contract.)
The iCAP software decrements the available TiCAP balance every 30 minutes based on the number of
cores using TiCAP. Figure 5 shows the state after running for one day in failover mode.
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