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Can TPX use L-Serv to manage TPX VSAM databases?

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Article ID: 244140

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Updated On:

Products

TPX - Session Management

Issue/Introduction

L-Serv is not required.
This is an optional product within Common Services that may be used with multiple TPXs that share one set of VSAM files.
The benefits and downside of L-Serv are detailed below.

Environment

Release: 5.4
Component:  TPX for Z/OS

Resolution

Using L-Serv for file sharing among multiple copies of TPX is highly recommended.
Note :
         L-Serv must run on all LPARs where all of the TPX started tasks are running.

Some of the operational and performance benefits of using L-Serv include:

- Reduction in the VSAM I/O generated by TPX.
- Improved performance by using high performance VSAM buffering.
- Provide Cross-System VSAM file sharing among TPX started tasks operating on different systems.
- Improve File security by establishing L-Serv as the only user that can access files.
- Provide less disruptive backup and restore operations by allowing maintenance on individual VSAM files without taking TPX down.


The downside of using LServ (disadvantages)  is that there is a single point of failure.

 For example: VSAM ADMIN1 file failure then causes problems for all TPX regions sharing that file. 
 Requires LServ to be started on all LPARs that TPX is started on. In addition, it adds overhead to the TPX product.

Running TPX as a Generic Resource is preferred.