IBM Power 780 Technical Overview And Introduction page 166

Dynamic Platform Optimizer should be launched through the HMC command-line interface
with the optmem command (see Example 3-1). The lsoptmem command is able to show
important information about current, and predicted, memory affinity, and also monitor the
status of a running optimization process.
Example 3-1 Launching DPO for an LPAR 1
#optmem -m <managed_system> -t affinity -o start
TIP: While the DPO process is running, the affected LPARs can have up to 20%
performance degradation. To explicitly protect partitions from DPO, use the -x or --xid
options of the optmem command.
For more information about DPO, see IBM PowerVM Virtualization Managing and Monitoring,
SG24-7590.
Dynamic System Optimizer
Dynamic System Optimizer (DSO) is a PowerVM and AIX feature that autonomously tunes
the allocation of system resources to achieve an improvement in system performance. It
works by continuously monitoring, through a userspace daemon, and analyzing how current
workloads impact the system and then using this information to dynamically reconfigure the
system to optimize for current workload requirements. DSO also interacts with POWER7
Performance Monitoring Unit (PMU) to discover the best affinity and page size for the
machine workload.
N_Port ID Virtualization (NPIV)
NPIV is a technology that allows multiple logical partitions to access independent physical
storage through the same physical Fibre Channel adapter. This adapter is attached to a
Virtual I/O Server partition that acts only as a pass-through, managing the data transfer
through the POWER Hypervisor.
Each partition that uses NPIV is identified by a pair of unique worldwide port names, enabling
you to connect each partition to independent physical storage on a SAN. Unlike virtual SCSI,
only the client partitions see the disk.
For additional information and requirements for NPIV, see the following resources:
PowerVM Migration from Physical to Virtual Storage, SG24-7825
IBM PowerVM Virtualization Managing and Monitoring, SG24-7590
Support: NPIV is supported in PowerVM Standard and Enterprise Editions on the IBM
Power 770 and Power 780 servers.
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IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction