Z/OS_Allocate a dataset

Use Host Explorer's "Allocate" functionality to create a new VSAM, IAM, or Sequential dataset or PDS member and define all values for it. Use the "Allocate Like" functionality to create a new dataset with the values of another specified dataset.

To allocate a dataset

1. Do one of the following:
   • To allocate a PDS or Sequential dataset:
     • Right-click z/OS Datasets and select Allocate/Define>PDS or Sequential Dataset.
     • From the File menu, select New, toggle open the node, select PDS or Sequential Dataset, and click Next.
   • To allocate a VSAM or IAM dataset:
     • Right-click z/OS Datasets and select Allocate/Define>VSAM Cluster.
     • From the File menu, select New, toggle open the node, select VSAM Cluster, and click Next.
   • To allocate a generation dataset (GDS):
     • Right-click a GDG base and select Allocate Generation Dataset.
     • Right-click z/OS Datasets, select Allocate/Define>PDS or Sequential Dataset, and enter in the Dataset name field <GDG base dataset name>(+1).
     • From the File menu, select New, toggle open the node, select PDS or Sequential Dataset, click Next, and enter in the Dataset name field <GDG base dataset name>(+1).
   • To allocate a dataset with the values of another dataset, right-click the desired dataset listed under z/OS Datasets and select Allocate Like. The Allocate wizard page appears with fields populated by the corresponding attributes of the selected dataset.

2. Complete the fields on the wizard page.
   Notes: When allocating a VSAM or IAM dataset, note the following:

   • The Region share option list has the following options:
     • 1-All users read but only one can read and write to the dataset concurrently
     • 2-All users read and one can write to the dataset concurrently
     • 3-All users read and write to the dataset concurrently
     • 4-All users read and write to the dataset concurrently and the user program must use ENQ/DEQ
   • The System share option list has the following options:
     
     • 3 - All users read and write to the dataset concurrently
     • 4 - All users read and write to the dataset concurrently and the user program must use ENQ/DEQ
     • The $IAM radio button is used to select to use Innovation Data Processing's Innovation Access Method (IAM), a high-performance index-accessed method for z/OS operating systems, which offers advantages over the IBM-provided Virtual Storage Access Method (VSAM). Additionally, a VSAM dataset can be changed to an IAM dataset by entering $IAM anywhere within the target's name shown in the Cluster name field of the Allocate wizard page. The IAM service needs to be running on all LPARs being used.
   • Do the following:
     
     • If allocating a dataset, click Finish.
     • If allocating a dataset like another dataset, click Next, complete the fields on the second wizard page, then click Finish.

   A message indicates that the dataset was allocated. Refresh any matching collapsed filters if necessary to see the newly allocated dataset.