MOVE/COPY › Moving Data to Different Device Types

Moving Data to Different Device Types

Whenever data sets are being moved between different device types, CA Disk attempts to adjust the required space allocation accordingly, based on the BLKSIZE, RECFM, and DSORG for each data set. The accuracy of the space conversion depends on how well the actual data reflects the specified attributes.

For example, when a data set is moved from a 3390 to a 3380, an allocation adjustment to the target 3380 must be made. This adjustment is necessary because the track size of a 3390 is larger than that of a 3380. In this particular case, the allocation size of the target data set will most likely increase. In fact, it is normal for a 1 cylinder 3390 data set that is moved to a 3380 to increase to 2 cylinders on the target volume, as illustrated as follows:

However, if CA Disk under-allocates space during a device conversion, you can want to consider using one or more of the following sysparms:

ADPCTPDS
ADPCTOTH
ADTRACKS

For more information, see Space Allocation Algorithm in the Systems Guide.