IBM 525 - Manual (Page 4)

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Note: Some maximums and combinations of devices may be subject to configuration
restrictions.
Main storage consideration: The model 525 uses DDR2 memory DIMMs that are plugged in
pairs. Each 525 DDR2 memory feature represents one pair of DIMMs. A model 525 requires a
minimum of one and a maximum of four memory features.
System i5™ 525 configurations
The 9406 model 525 is offered as an Express Configuration or as a Capacity BackUp (CBU)
Configuration.
Three Express Configurations consist of 30, 150, or an unlimited number of concurrent i5/OS
user entitlements. You can add i5/OS user entitlements to the 30 or 150 entitlement Express
Configurations.
A CBU Configuration includes a financially attractive model 525 when you purchase a second
system for backup, high availability, and disaster recovery. The CBU Configuration includes 30
concurrent i5/OS user entitlements with the option to add more.
A CBU system delivers the capacity for role-swap operations — where the CBU system
maintains application availability when a production system is down for planned or unplanned
outages. You can activate a standby processor using On/Off Capacity on Demand, at no
additional charge, in case of a disaster that takes down the primary system. "Disaster" is defined
as an event recoverable from an offsite location only that has resulted from the unforeseen loss
of a production system's computing capability due solely to forces beyond your control. To
qualify as a disaster, the outage must be one that clearly, by its nature, requires a remote
recovery operation. This means that the primary data center is no longer usable and the outage
is not due to a hardware or software failure.
Before IBM ships a new CBU Configuration system, you must register a primary system in the
same enterprise at the System i CBU Edition Web site. The primary system must be a model
525 or a model 520. The model 520 primary system cannot be an Express Configuration, Value
Edition, High Availability Edition, or Telephony Edition. If you purchase a model 525 CBU to be
paired with a model 520 primary machine, you may purchase additional i5/OS users and an
unlimited option at a reduced price. After the initial acquisition of the 525 CBU, additional i5/OS
users and the unlimited option are at normal prices.
You can purchase On/Off Capacity on Demand for temporary standby processor activation for
the 525 as needed. However, high usage of On/Off Capacity on Demand outside a disaster can
be costly. Permanent processor activations should be considered for ongoing requirements.
If you have permanently activated the second processor of the 525 CBU system and you do not
already have an i5/OS processor license entitlement for that processor, you can temporarily
transfer the second i5/OS processor entitlement from a primary 1/2-way 525, 2-way 520, or
1/2-way 520 to the 525 CBU system. This can be done if the primary system or application on
the primary system goes down and the second i5/OS processor entitlement is not being used on
the primary system.
Similarly, if you have i5/OS user license entitlements that are not being used because the 525
primary system or application on the 525 primary system goes down, you can temporarily
transfer user entitlements from the primary 525 to the CBU 525. The i5/OS user entitlements that
can be transferred are above and beyond the minimum 30 base i5/OS users included with any
525 Express Configuration. User license entitlements cannot be transferred from a primary 520
system to a 525 CBU system.
The 525 CBU Configuration includes an opportunity for an initial test of the switch-over
environment. Three processor days are credited to your account. These processor days are
provided at no additional charge with the On/Off Capacity on Demand function that can be used
for the standby processor.
Upgrades are available for the model 525 CBU Configuration from smaller model 520 CBU
Editions.
For CBU Configuration registration and additional information on the CBU Edition, visit
http://www.ibm.com/systems/i/hardware/cbu
For more information on edition content, including specific ordering details and IBM configuration
implementation, visit
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