VSAM File Sharing With CA-L-Serv › How to Customize CA-L-Serv for CA TPX › Specify the Disposition and Share Options

Specify the Disposition and Share Options

To ensure adequate protection for the files, you must carry out the following tasks:

• Set the VSAM share options for managed files to (1,3) or (2,3). This takes advantage of CA-L-Serv performance advantages and is required to ensure restricted access to the managed files.
• Set the VSAM option for managed files to REUSE.
• Set the disposition of managed files to DISP=OLD in the CA-L-Serv startup procedure.

  To do this, override the default (DISP=SHR) using the following steps:

  1. Code a DD statement explicitly for the file in the CA-L-Serv startup JCL.
  2. Code the ADDFILE command for the file with the ddname but without the data set name.

  Unless you perform these steps, the ADDFILE command will allocate the file with DISP=SHR, and the file can be exposed to unauthorized updates.

When a file is allocated with DISP=OLD, it cannot be browsed online while under CA-L-Serv management, and the CA-L-Serv IFSYS command cannot be used to run multiple copies of CA-L-Serv with the same initialization commands and startup procedures. Using the IFSYS command in this manner would cause the multiple copies of CA-L-Serv to attempt to allocate the same files with DISP=OLD.