Starting Your Product › How to Configure the SCDS with CA MSM › Prepare for the SCDS Allocation

Prepare for the SCDS Allocation

Before configuring the SCDS with the SCS component of CA MSM, you must plan how it will be allocated.

To prepare for the SCDS allocation

1. Calculate the size needed for your SCDS by following the instructions in Calculating SCDS Space Requirements.

   Note: The calculation gives you the number of blocks you need, but SCS only allows allocations in tracks or cylinders. Allocations smaller than 10 cylinders must be made in tracks.

   • For devices with 3390 track geometry, use 12 blocks per track.
   • For devices with 3380 track geometry, use 10 blocks per track.

   Perform the calculation as indicated and if you are not sure of the value, estimate and be generous. Make sure you round up the final total to a multiple of the number of blocks as indicated. For example, in the sample calculation the number of blocks needed comes to 381. For a 3390, allocating 32 tracks would provide space for 384 blocks.

2. Select a DASD volume or storage class for the SCDS.
   • To put the SCDS on a specific volume, select the volume and appropriate unit esoteric.
   • If you want SMS to select a volume, just specify a storage class.
3. Select a meaningful data set name for the SCDS.

More information:

Step 3. Allocate the Control Data Set (SCDS)

Allocate the SCDS

You can use SCS to allocate and initialize the SCDS.