Number of blocks

The required number of blocks is calculated according to the following formula:

tf_num_blks = (tf_num_rcds / x1) + 10

where

• x1 is (blk_size - 10) / (660 + 58)
• x2 is the average number of data sets per volume
• x3 is the number of volumes mounted per day
• x4 is the number of volumes scratched per day
• x5 is the number of volumes changing location (that is, vault) per day
• x6 is the number of days to retain the information in the Trace file
• tf_num_rcds = ((6 * x2 + 6) * x3 + 2 * x4 * (x2 + 1) + 2 * x5) * x6