AIX 5L Performance Tools Handbook by IBM Redbooks

By IBM Redbooks

This IBM Redbook takes an insightful examine the functionality tracking and tuning instruments which are supplied with AIX 5L. It discusses using the instruments in addition to the translation of the implications in lots of examples.This e-book is intended as a reference for process directors and AIX technical aid execs to allow them to use the functionality instruments successfully and interpret the outputs while examining AIX approach performance.A common inspiration and creation to the instruments is gifted to introduce the reader to the method of AIX functionality analysis.The person functionality instruments mentioned during this e-book fall into those categories:- Multi-resource tracking and tuning instruments- CPU-related functionality instruments- Memory-related functionality instruments- Disk I/O-related functionality instruments- Network-related functionality instruments- functionality tracing instruments- extra functionality issues, together with functionality tracking API, Workload supervisor instruments, and function toolbox for AIX.

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Extra info for AIX 5L Performance Tools Handbook

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1 Initial advice We recommend that you do not make any VMM changes until you have had experience with the actual workload. 12, “vmtune” on page 201. 2 Memory segments A segment is 256 MB of contiguous virtual memory address space into which an object can be mapped. Virtual memory segments are partitioned into fixed sizes known as pages. Each page is 4096 bytes (4 KB) in size. A page in a segment can be in real memory or on disk where it is stored until it is needed. Real memory is divided into 4096 byte (4 KB) page frames.

26 AIX 5L Performance Tools Handbook update will require a repositioning of the disk write head to update the MWC record, it can cause a performance problem. When the volume group is varied back on-line after a system crash, this information is used to make the logical partitions consistent again. Passive MWC is used for the mirrored logical volume but the LVDD will not keep the MWC record synchronized on disk. Synchronization of the physical partitions that belong to the mirrored logical partition will be updated after IPL.

For every write to a logical volume, the LVDD 3 generates a write request for every mirror copy. If a logical volume is using mirror write consistency, then requests for this logical volume are held within the scheduling layer until the MWC cache blocks can be updated on the target physical volumes. When the MWC cache blocks have been updated, the request proceeds with the physical data write operations. If the system crashes in the middle of processing, a mirrored write (before all copies are written) MWC will make logical partitions consistent after a reboot.

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