The following example uses the work sheet in Figure 1 and the following assumptions to calculate how many cylinders are needed for the MCDS.

1. Assuming that your environment consists of the following:

   150␠000 data sets that you want to have migrated (mds)

2. Substitute the value for mds into the following calculation. This is the space for your current MCDS records.

      516  x  (mds = 150␠000)  =  subtotal    =    77␠400␠000

3. Multiply the subtotal by 1.5 to allow for additional MCDS growth.

      77␠400␠000   x   1.5   =   116␠100␠000

4. Divide the total number of bytes per cylinder (using 3390 as an example) into the total number of bytes for the MCDS. If the result is a fraction, round up to the next whole number. This is the number of cylinders you should allocate for the MCDS.

   Total bytes used by the MCDS		(total = 116␠100␠000)
   ___________________	=	__________________	=	157.4 or approximately 158 cylinders
   Total bytes per cylinder (3390)		737 280