5486wrkperf.fm Draft Document for Review October 18, 2004
50 IBM Eserver i5 and iSeries System Handbook
9,999 memory day, place an order for another memory enablement code to reset
the number of days you can request to 9,999.
Refer to the individual model chapters for feature details.
iSeries Reserve Capacity on Demand
IBM Eserver Reserve Capacity on Demand delivers great flexibility in meeting
peak demands. This option is also ideal for spikes in needed capacity (in other
words, peak loads). But unlike On/Off CoD, a Prepaid Activation Feature is
purchased up-front that sets a value on the server representing the number of
processor days that can be used as reserve CoD capacity. No contract and no
reporting to IBM is required when paying for the reserve capacity ahead of time.
Reserve CoD represents an automatic way to activate temporary capacity.
Reserve CoD enables the user to place a quantity of inactive processors into the
server’s shared processor pool, which then becomes available to the pool’s
resource manager. When the server recognizes that the number of base
(purchased/active) processors and assigned across uncapped partitions has
been 100% utilized, and at least ten percent of an additional processor is needed
(based on multiple hits over the measured period), then a processor day is
charged against the reserve CoD account balance. The processor day is good
for 24 hours. Another processor day is charged for additional processor put into
use based on the 10% utilization rule. No charging occurs when the 24-hour
clock expires and there is no longer a need for additional processors.
Reserve CoD is an effective way to handle peak loads that occur on a limited
basis. Unlike On/Off CoD, contracts and reporting to IBM is not required. The
purchase of reserve CoD activation time is prepaid in blocks of 30 processor
days. Multiple blocks of activations can be loaded at a time.
Reserve processor days are transferred with the machine if the server is
transferred to a different customer. Any remaining reserve processor days are
lost when upgrading to a different model, or physically adding processors. For
example, if upgrading from a 2/4 way to a 5/8 way, the reserve processor days
are set to zero.
Note: The break-even pricing for processor days on the Eserver i5 servers is
approximately 90 processor days. In other words, you can permanently
activate a processor for the same price it costs to prepay for 90 processor
days of reserve CoD capacity.
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