The z990 supports concurrent memory upgrade. This capa- bility will allow a processor’s memory to be increased with- out disrupting the processor operation. To take advantage of this capability, a customer should not plan processor storage on the 16 or 32 GB increments. A customer with a Model A08, for example, with 24 GB of storage will be able to concurrently upgrade to 32 GB but will not be able to get to the next increment of 40 GB without a disruption.
Plan Ahead for PUs is done by ordering a “more book” model. For example, if a customer needs 5 PUs initially, but plans to grow to need 10 PUs, he should not order an A08, but a Model B16 with only 5 PUs initially active.
The Plan Ahead process can easily identify the customer confi guration that is required to meet future needs. The result of concurrent conditioning is a fl exible IT infrastruc- ture that can accommodate unpredictable growth in a low risk, nondisruptive way. Depending on the required Con- current Conditioning, there should be minimal cost associ- ated with dormant z990 capacity. This creates an attractive option for businesses to quickly respond to changing environments, bringing new applications online or growing existing applications without disrupting users.
z990 Server Capacity BackUp (CBU)
Capacity BackUp (CBU) is offered with the z990 servers to provide reserved emergency backup CPU capacity for situations where customers have lost capacity in another part of their establishment and want to recover by adding reserved capacity on a designated z990 server. A CBU system normally operates with a “base” CP confi guration and with a preconfi gured number of additional Processor Units (PUs) reserved for activation in case of an emergency.
The z990 technology is suited for providing capacity backup. The reserved CBU processing units are on the same technology building block, the MCM, as the regular CPs. Therefore, a single server can support two diverse confi gurations with the same MCM. For CBU purposes, the Models A08, B16, C24 & D32 can scale from a
The “base” CBU confi guration must have suffi cient memory and channels to accommodate the potential needs of the larger CBU target machine. When capacity is needed in an emergency, the primary operation performed is activating the emergency CBU confi guration with the reserved PUs added into the confi guration as CPs.
Customers who have an active Remote Support Facility connection can perform a CBU upgrade automatically and within a matter of minutes, right from their CBU machine’s Hardware Management Console (HMC). For more informa- tion on how a CBU upgrade can be activated automati- cally, please refer to the z990 Capacity BackUp Users' Guide found on IBM Resource Link.
The z990 supports concurrent CBU downgrade. This func- tion enables a Capacity BackUp server to be returned to its normal confi guration without an outage (i.e. PowerOn Reset).
Automatic Enablement of CBU for Geographically
Dispersed Parallel Sysplex (GDPS)
The intent of GDPS support for CBU is to enable auto- matic management of the reserved PUs provided by the CBU feature in the event of a processor failure and/or a site failure. Upon detection of a processor failure or site failure, GDPS will activate CBU to dynamically add PUs to
30