Intel 170 Servers manual 16.10 5XX IOP vs IOPLess effects on IPL Performance Normal, IPL Tips

16.10 5XX IOP vs IOPLess effects on IPL Performance (Normal)

Measurement units are in minutes and seconds.

Table 16.10.2 Normal IPL - Power-On (Cold Start)

	iV5R4	iV5R4
	GA7 Firmware	GA7 Firmware
	16 Way IOP	16 Way IOPLess
	570	570
	7476	7476
	256 GB	256 GB
	924 DASD	924 DASD
Hardware	17:44	18:06
SLIC	6:43	7:20
OS/400	2:32	2:52
Total	26:59	28:18

16.11 IPL Tips

Although IPL duration is highly dependent on hardware and software configuration, there are tasks that can be performed to reduce the amount of time required for the system to perform an IPL. The following is a partial list of recommendations for IPL performance:

yRemove unnecessary spool files. Use the Display Job Tables (DSPJOBTBL) command to monitor the size of the job table(s) on the system. Change IPL Attributes (CHGIPLA) command can be used to compress job tables if there is a large number of available job table entries. The IPL to compress the tables maybe longer, so try to plan it along with a normal maintenance IPL where you have the time to wait for the table to compress.

yReduce the number of device descriptions by removing any obsolete device descriptions.

yControl the level of hardware diagnostics by setting the CHGIPLA command to specify HDWDIAG(*MIN), the system will perform only a minimum, critical set of hardware diagnostics. This type of IPL is appropriate in most cases. The exceptions include a suspected hardware problem, or when new hardware, such as additional memory, is being introduced to the system.

yReduce the amount of rebuild time for access paths during an IPL by using System Managed Access Path Protection (SMAPP). The IBM i operating system Backup and Recovery book (SC41-5304) describes this method for protecting access paths from long recovery times during an IPL.

yFor additional information on how to improve IPL performance, refer to IBM i operating system Basic System Operation, Administration, and Problem Handling (SC41-5206)- or to the redbook The System Administrator’s Companion to IBM i operating system Availability and Recovery (SG24-2161).

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 16 IPL Performance	279