2. PLANNING › 2.3 SMF Requirements › 2.3.2 SMF Requirements (VCC-DFHSM)

2.3.2 SMF Requirements (VCC-DFHSM)

The VCC interface for DFHSM data collection generates
variable length records that can be written to the VCCHSM
data set or logged to SMF.  The records vary in size from 63
to 126 bytes.  Variable length fields such as SMS class names
and dsname are stored as variable length strings with no
padded blanks.

Due to the high volume of data potentially found for data
sets under DFHSM management, we recommend that you do NOT log
data from this interface directly to SMF.  You should use the
VCCHSM data set to receive the records from this interface.
One record will be written for each:

    o   Migrated data set on ML1 or ML2 storage as defined in
        the MCDS at the time of data collection.

    o   Backup version of any data set as defined in the BCDS
        at the time of data collection.

The above items represent the vast majority of data written
by this interface.  In addition, this interface writes one
record (called a DASD planning record) for each:

    o   Primary volume (migration level 0) for each day there
        was HSM activity.

    o   Migration level 1 volume for each day there was DFHSM
        activity.

Last in terms of number of records (bytes) written by this
interface is a series of three tape capacity planning
records.  The VCC-DFHSM interface writes one tape capacity
planning record for each of the following types of tape:

    o   Migration level 2 tapes
    o   Incremental backup tapes
    o   Full volume backup tapes

In summary, consider the following example as an aid in
understanding the number of records put out by this
interface:

        100,000 "active" permanent data sets on primary DASD
        volumes

        20 percent of these data sets are NOT backed up using
        DFHSM incremental backup or HBACK commands

        Of the remaining 80,000 data sets on primary DASD,
        DFHSM maintains an average of 5 backup versions
        for each data set

                            (B = 80,000 * 5 = 400,000)

        50,000 data sets are migrated to ML1 volumes

                            (ML1 = 50,000)

        200,000 inactive data sets have been migrated to ML2
        volumes
                            (ML2 = 200,000)

        200 DASD volumes have DFHSM activity each day and
        MIGRATIONCLEANUPDAYS(5) is specified in the DFHSM
        SETSYS command

                            (C= 200 * 5 = 1000)

        Three tape inventory records are always written

                            (T = 3)

The summation of the above figures provides the number of
records produced to the VCCHSM data set or to SMF in a given
inventory:

     TOTAL = B + ML1 + ML2 + C + T

     TOTAL = 400,000
            + 50,000
            +200,000
            +  1,000
            +      3
            +      1   (Trailer record)
            --------
             651,004   records written to VCCHSM (or to SMF)