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## Physical volume pools 

Based on your requirements, you must decide whether TEST and PROD can be on the same physical volumes, share volumes from the same physical volume pools, or must be placed on separate physical volumes. 

Consider the following points: 

GLYPH<SM590000> If sharing of same physical volumes is acceptable , all logical volumes from TEST and PROD are mixed on the physical VOLSERs. Separate pools for PROD and TEST are not required. 

GLYPH<SM590000> If sharing of same physical volume ranges is unacceptable, total separation of physical volume ranges can be accomplished by assigning specific physical volume ranges for each pool and by using the noborrow/keep  options. 

The Physical Volume Pool Modify Properties window that is shown in Figure I-4 is used to define reclaim policies for each of the pools. Assign logical volumes to pool 1 for PROD and pool 2 for TEST, as shown in Figure I-9 on page 932. 

## Scratch categories 

<img src='content_image/987284.jpg'>

The TS7700 performs scratch mounts directly to the Tape Volume Cache (TVC) with no physical tape involvement. 

Note:  At Release 3.0 and higher, all categories that are defined as scratch  inherit the Fast Ready attribute. In previous releases, it was necessary to set this option in the MI. 

## Defining constructs 

Define the constructs on all clusters in the grid with definitions consistent with your policies. Complete the following steps: 

1. Define an SC for TEST named TSSCPG0. This SC is for volumes that are unlikely to be used (level 0 or PG0), as shown in Figure I-5 on page 931. The other SCs must be defined in a similar way. Ensure that Tape Volume Cache Preference is set according to the defined SC name. 

