IBM Power 720 User Manual

146 IBM Power 720 and 740 Technical Overview and Introduction
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
For more information about DPO, see IBM PowerVM Virtualization Managing and Monitoring,
SG24-7590.
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
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.
Note: Single-socket systems do not require DPO, and there is no performance penalty
when accessing memory in the same card.
Feature AIX
5.3
AIX
6.1
AIX
7.1
IBM i
6.1.1
IBM i
7.1
RHEL
5.8
RHEL
6.3
SLES 10
SP4
SLES 11
SP2
Virtual SCSI Yes Yes Yes Yes Yes Yes Yes Yes Yes
Virtual Ethernet Yes Yes Yes Yes Yes Yes Yes Yes Yes
Shared Ethernet Adapter Yes Yes Yes Yes Yes Yes Yes Yes Yes
Virtual Fibre Channel Yes Yes Yes Yes Yes Yes Yes Yes Yes
Virtual Tape Yes Yes Yes Yes Yes Yes Yes Yes Yes
Logical partitioning Yes Yes Yes Yes Yes Yes Yes Yes Yes
I/O adapter add/remove Yes Yes Yes Yes Yes Yes Yes Yes Yes
Processor add/remove Yes Yes Yes Yes Yes Yes Yes Yes Yes
Memory add Yes Yes Yes Yes Yes Yes Yes Yes Yes
Memory remove Yes Yes Yes Yes Yes No Yes No Yes
Micro-Partitioning Yes Yes Yes Yes Yes Yes
a
Ye s
b
Ye s
a
Ye s

IBM Power 720 Specifications

General

Brand	IBM
Model	Power 720
Category	Server
Language	English