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In the initial planning for the A+ resources of a cluster, it is the goal to keep the required
resources fully functional during the lifetime of a cluster. The A+ resources are set in the
lifespan to replace faulty components, and allow the customer to run applications with the
computing power that is initially ordered.
5.4.4 Identifying an A+ resource
When a hardware serviceable event is reported on a Power 775 System, a field-replaceable
unit (FRU) list is included. The A+ procedures must be performed as soon as an A+ resource
is reported in the FRU list. For more information about identifying an A+ resource, see Table
on page 299.
Many tasks that are performed by the administrator use xCAT commands to reassign the
resources. For more information, see this website:
https://sourceforge.net/apps/mediawiki/xcat/index.php?title=Cluster_Recovery
An A+ resource is defined when the following conditions occur:
The FRU location includes an "R" identifier. For example, U787C.001.1234567-P1-R1.
The following ranges of locations are defined by using regular expressions:
– U*-P1-R[1-8] are HFI hub modules. For example: U*-P1-R7
– U*-P1-R[1-8]-R[1-40] are optical module port locations that are contained on the hub
modules: U*-P1-R[1-8]. For example, U*-P1-R3-R5.U*-P1-R[9-40] are processor chip
locations.
For example, U*-P1-R10 are in groups of four per QCM. Also, U*-P1-R[13-16] are all on
the same QCM, which is in the second octant.
The FRU location is an HFI port location.U*-P1-T[1-8]-T* and U-P1-T[9-17]-T* are D-link port
connector locations on the bulkhead.U*-P1-T9 is the LR-link port connector location on the
bulkhead.
Important: The location identifier U787C.001.1234567 often is noted in examples that use
the shorthand of U*.
Chapter 5. Maintenance and serviceability
299
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