The Instant Capacity software tracks the expected number of
inactive components (processors, cells, and memory) in a complex
and knows the actual number of active and inactive components. The
complex is in compliance if the actual number of inactive components
meets or exceeds the expected number of inactive components.
The complex is out of compliance if the actual number of inactive components
is less than the expected number of inactive components and no temporary
capacity exists.
However, a complex can also get out of compliance if a cell
is removed from the complex. For example, if a cell contains inactive
processors that are contributing to compliance, and the cell is
removed, it is possible that the complex is out of compliance and
temporary capacity begins to be debited.
Example A-1 Removing
a Cell and Decreasing the Actual Number of Inactive Processors
For example, a complex contains two cells, with two partitions
having two unlicensed and two active processors each. The Instant
Capacity software expects the complex to have four inactive processors.
If one of the cells (0) experiences a hardware problem, and you
remove the cell, the complex is left with only one cell that contains
two active and two inactive processors. The complex is now out of
compliance because four inactive processors are expected to be in
the complex, yet there are only two inactive processors.
Table A-1 Removing a Cell — Decrease Inactive Processors
State | Partition (Cell) 0 | Partition (Cell) 1 | Notes |
|---|
Before Cell 0 is Removed | 2 active
2 inactive | 2 active
2 inactive | 4 inactive processors expected (in compliance) |
After Cell 0 is Removed | 0 active
0 inactive | 2 active,
2 inactive | 4 inactive processors expected (out of compliance) |
In the above example, because the removed cell causes the
complex to be out of compliance, temporary capacity begins to be
debited at the rate of two processor-hours per hour.
Temporary Instant Capacity (TiCAP) allows for increased capacity,
even in the presence of a cell hardware failure, which necessitates
the removal and repair of a cell. Removal of a cell, followed by
a reboot of the partition it was assigned to, results in a maximal
number of active processors in the partition (subject to the configured
intended number of active processors), while the maximum number
of unlicensed processors are relegated to the removed cell. During
the period when the cell is absent, temporary capacity is consumed
for each (newly missing) unlicensed processor that was shifted to
the removed cell. Having additional Temporary Instant Capacity allows
for increased capacity during rare hardware failures that would
otherwise not have been possible.
Printable version
