DCMT VARY Commands › DCMT VARY STORAGE › DCMT VARY STORAGE Usage

DCMT VARY STORAGE Usage

Establishing the Cushion Size

• For the primary storage pool (that is, storage pool 0), the cushion size is initially established at system generation time by the CUSHION parameter of the SYSTEM statement.
• For the secondary storage pools 1 through 127, the cushion size is initially established at system generation time by the CUSHION parameter of the STORAGE POOL statement
• For the secondary storage pools 128 through 254, the cushion size is initially established at system generation time by the CUSHION parameter of the XA STORAGE POOL statement

Tuning Relocated Resources

Relocating storage improves use of the storage pool but also increases I/O to the scratch area. You use the RELOCATABLE THRESHOLD option to fine-tune how often resources are relocated.

Establishing Relocatable Thresholds

You use the system generation ADSO statement to establish whether CA ADS resources are relocatable. You specify the initial relocatable thresholds for storage pools when you define the pools at system generation time.