Dynamic System Optimizer; Operating System Support For Powervm - IBM Power 720 Overview

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.
Note: Single-socket systems do not require DPO, and there is no performance penalty
when accessing memory in the same card.

3.4.9 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 the
Performance Monitoring Unit (PMU) to discover the best affinity and page size for the
machine workload.

3.4.10 Operating system support for PowerVM

Table 3-5 summarizes the PowerVM features that are supported by the operating systems
compatible with the POWER7+ processor-based servers.
Table 3-5 Virtualization features supported by AIX, IBM i and Linux
Feature
Virtual SCSI
Virtual Ethernet
Shared Ethernet Adapter
Virtual Fibre Channel
Virtual Tape
Logical partitioning
I/O adapter add/remove
Processor add/remove
Memory add
Memory remove
Micro-Partitioning
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IBM Power 720 and 740 Technical Overview and Introduction
AIX AIX AIX IBM i
5.3 6.1 7.1 6.1.1
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
IBM i RHEL RHEL
7.1 5.8 6.3
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes No Yes
a b
Yes Yes Yes
SLES 10 SLES 11
SP4 SP2
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
No Yes
a
Yes Yes