VSAM File Sharing Without CA-L-Serv › Allow VSAM Sharing Without CA-L-Serv

Allow VSAM Sharing Without CA-L-Serv

To allow VSAM sharing in your system

1. Set the VSAM share options on each VSAM data set to (4,3).
2. Specify DISP=SHR in the DD statement for any data set that is to be shared.
3. Re-evaluate your usage of the option Reserve ACB's at startup on the Performance Parameters panel in the System Options Table (SMRT). If it is set to Y, startup will be slowed down significantly when VSAM sharing is used.

   The option Reserve ACB's at startup causes the product to read the entire ADMIN2 data set, searching for user records that have ACB names that are fully qualified (consist of eight characters and no masks). With VSAM sharing this process is slow.

   You must set this option to Y only if you have assigned users a fully qualified ACB name through User Administration. If you have assigned users by using masking, the Reserve ACB's at startup option can be set to N.

   If you must reserve specific ACBs for specific users, in most cases you can set up masking rules to accomplish this. If you cannot use masking, using either the ACB Selection Exit or the OPENGATE feature can eliminate the need for using the Reserve ACB's at startup option.

4. Authorize the load library on each system that CA TPX runs on.
5. Re-evaluate the placement of the VSAM data sets. You can move them to minimize the effects of the RESERVEs used to serialize access to the data sets.

Note: Sharing is not possible for VM systems or non-authorized copies of this product. If you select sharing and do not authorize CA TPX, an abend will occur.