IBM Enterprise Workload Manager Release 1

16 IBM Enterprise Workload Manager

2. The same transaction classification result that was reflected in the parent ARM correlator,

which is still the result achieved by the Apache server.

If the DB2 server were to call yet another server hop to contribute to this transaction

instance’s processing, the DB2 server’s current ARM correlator would become the parent

ARM correlator for that additional hop. In our scenario that is not the case, since the DB2

server represents the deepest hop.

When query processing has completed, the DB2 server calls arm_stop_tran() and returns

control to the WebSphere Application Server. Eventually, WebSphere Application Server

completes its portion of the transaction instance processing, calls arm_stop_tran() and

returns control to the Apache server. In turn, the Apache server wraps up its processing and

also calls arm_stop_tran(). Transaction (and sub-transaction) instance response times are

computed in arm_stop_tran() processing for each hop, and provided to EWLM managed

server logic along with transaction instance application and server topology information, all of

which is aggregated with other transaction instance data and sent to the EWLM domain

manager every 10 seconds. It is important to understand that each transaction is not sent to

the domain manager. The managed server EWLM code aggregates the data before sending

any to the domain manager. This allows for greater scalability of the EWLM Management

Domain.

The domain manager collects the data from the managed servers and aggregates that data

across the domain. This is used to report on how well each service class is achieving its goal

and can be provided to load balancers to manage workload at the edge servers. Eventually,

as EWLM evolves, this data will also be used to manage the entire domain.

1.3 EWLM supported platforms and applications

EWLM supports the following operating systems for the domain manager and managed

server for the current release of EWLM. It is expected that support will be provided for

additional operating systems in the near future.

򐂰 Supported operating systems for the domain manager:

– Red Hat Enterprise Linux Advanced Server 2.1 (RHEL AS 2.1)

– SUSE Linux Enterprise Server 8 (SLES 8)

– AIX 5L™ Version 5.2 ML03

– i5/OS™ Version 5 Release 3 with the most current maintenance level

(Check that SI12723, SI12725, MF32801, MF32814, MF32677 and SI13547 are

installed.)

– Windows 2000 Server Family (the latest service pack is recommended)

– Windows 2003 Server Family (the latest service pack is recommended)

򐂰 Supported operating systems for managed servers:

– AIX 5L Version 5.2 ML03

– i5/OS Version 5 Release 3 with the most current maintenance level

(Check that SI12723, SI12725, MF32801, MF32814, MF32677 and SI13547 are

installed.)

– Windows 2000 Server Family (the latest service pack is recommended)

– Windows 2003 Server Family (the latest service pack is recommended)

– Solaris 8 and 9 supporting 32 and 64 bit user programs

Chapter 1. IBM Enterprise Workload Manager Overview 17

򐂰 Supported browser for user interface:

– Internet Explorer V6 SP1

EWLM is first installed at the domain manager. The domain manager installation also creates

install images on the domain manager operating system instance for the target managed

server operating systems that you select. These managed server install images must be

copied to the target operating systems and an install executed there for the managed server.

Table 1-1 identifies the space requirements for installation. Column 4 is the amount of space

required at the domain manager for the target operating system’s managed server install

image. Column 5 is the space required at the managed server target operating system. The

values reported in the table are a guideline for the required space based on the maintenance

level of code we used in our installation, but you might use them for initial planning.

Table 1-1 EWLM space requirements for installation

* This size is required for the installation. More space is required when data is collected.

Refer to “Domain manager resource description” on page 220 for a more accurate evaluation

of the space required by the internal database.

Operating

system

Installation directory Domain

manager space

and VE Install

Managed server

installation space

at the domain

manager

Managed

server space

Domain

manager

working

directory*

AIX /opt/IBM/VE 1.3GB 41MB 60MB 100MB

Linux /opt/IBM/VE 1.3GB n/a n/a 110MB

Solaris /opt/IBM/VE n/a 39MB 191MB n/a

i5/OS /QIBM/ProdData/VE 20MB (only DM) 22MB 20MB 100MB

Windows C:\Program Files\IBM\VE 1.6GB 44MB 53MB 100MB

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