z/OS DFSMS Using Data Sets
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Multiple System Sharing of PDSEs

z/OS DFSMS Using Data Sets

Multiple systems in a sysplex that is running extended sharing can concurrently access PDSE members for input and output, but not for update-in-place. That is, multiple users on multiple systems can simultaneously share the same PDSE for input, output, and update-in-place, with the restriction that any particular member while being updated-in-place can only be accessed by a single user.
Note: PDSE sharing between sysplexes is not supported.

A shared-access user of a PDSE can read existing members and create new members or new copies of existing members concurrently with other shared-access users on the same system and on other systems. Shared access to a PDSE during an update-in-place of a member is restricted to a single system. Programs on other systems cannot open the data set.

Figure 1 shows the results of OPEN for UPDAT.

Figure 1. OPEN Success/Failure

Figure 2 shows the results of OPEN for UPDAT with positioning in a decision table.

Figure 2. OPEN for UPDAT and Positioning to a Member Decision Table

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