Tuning hints & tips



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The following is a collection of observations/recommendations from the Linux Performance Team for Linux on System z. These numbers are not intended for comparison with similar products on other platforms.

Compile options

CPU time accounting

Disk I/O

	DASD block size
	Disk performance optimizing
	ECKD and SCSI on DS8000
	Fixed I/O buffers
	IBM TotalStorage Enterprise Storage Server (ESS) subsystem operating modes
	Linux kernel 2.6 - I/O scheduler
	Multipathing with SCSI disks
	Volume management

Database server

General recommendations

	FICON/ECKD or FCP/SCSI for database disks
	Scaling storage servers
	Disk setup
	Linux kernel 2.6 - I/O options
	ext2 or ext3 filesystem?
	Tuning read ahead / prefetch features
	31-bit vs. 64-bit database architectures
	CPU scaling
	Shared memory setup
	Swapping

DB2 recommendations

	DB2 recommendations for kernel parameters
	DB2 parameters

Informix recommendations

	Memory size
	Usage of the update statistics statement

Oracle recommendations

	Initialization parameters used for Oracle I/O option measurements
	Miscellaneous settings
	Selecting the test scenario
	I/O options
	Relink Oracle for async I/O

Java

Networking

Resource management & analysis

Masking devices with cio_ignore

Timer patch

Web applications

Apache webserver

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Document options

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Team

Please address any comments to the performance team: linux390@de.ibm.com