FDRPASVM environment

Type of disk array

What disk array manufacturer and how many volumes do you plan to swap data from and to:

Determining the type and amount of DASD being migrated

Amount of DASD being used

How many GB/TB of data is planned to be swapped?

The QUERY DASD and QUERY DASD DETAILS commands can be used to show all volumes attached to SYSTEM. However, calculating the space of all DASD on a system can be cumbersome. We recommend that you use the CALCDASD EXEC that is described in the next section.

CALCDASD EXEC

To make understanding how much DASD is being used easier, a REXX EXEC named CALCDASD has been made available. It is provided on the FDRMAINT 691 disk. If you do not yet have FDRPASVM installed, you can download a copy of it from the Additional Resources area for FDRPASVM in the BMC Support.

Following is an example of the help output:

==> calcdasd ?
Synopsis:
 Calculate the amount and types of DASD on a system and report
Syntax is:
 >>-CALCDASD-+---------------+-+------------------------------+-><
 |-rdev----------| | |
 | <-----------< | '-(-+---------+--+----------+--+
 '-rdev1-rdev2---' |-HELP----| | |
 |-SHORT---| '-SortOpts-'
 |-FREE----|
 |-PAV-----|
 |-OFFLINE-|
 |-CSV-----|
 '-ALL-----'
SortOpts:
 --+------------+--+------------+--+------------+--
 |-SORTRDEV---| |-SORTRDEV---| | |
 |-SORTVOLSER-| |-SORTVOLSER-| '-DESCENDING-'
 |-SORTMFG----| |-SORTMFG----|
 '-SORTCYLS---' '-SORTCYLS---'
Where:
 no rdev range: Query all DASD (QUERY DASD)
 rdev range: Query these addresses (QUERY rdev)
Options:
 HELP: Show this screen
 SHORT: Don't include one line of output/DASD device
 FREE|PAV|OFFLINE Report only on free/PAV/offline DASD
 CSV: Generate a comma separated values file
 ALL: Also show FREE, PAV and OFFLINE DASD (Q 0-FFFF)
Sort Options - primary and secondary sort fields:
 SORTRDEV: Sort by real device address (default)
 SORTVOLSER: Sort by volume serial number
 SORTMFG: Sort by manufacturer
 SORTCYLS: Sort by number of cylinders
 DESCENDING: Sort in descending EBCDIC (default: ascending)
Examples:
 Create CSV file: pipe cms calcdasd (csv |> calcdasd csv a
 Send to a file: pipe cms calcdasd (all |> calcdasd output a

For a complete report, we recommend that you use the ‘(ALL’ option and send the output to a file as is shown in the last line of the help output.

For more information on CALCDASD, see the following:

Before you start your z/VM system migration, please send output from CALCDASD to the BMC Support.https://support.compuware.com/s/

Following is an example of the output of CALCDASD on a small z/VM system.

The CALCDASD EXEC has other options that may be useful:

• FREE – to report on just free DASD devices
• SHORT – to print a summary without one line of output per DASD device
• PAV – to report on PAV or HyperPAV base and alias devices
• OFFLINE – to report on offline DASD devices
• CSV – to create comma-separated values files for input to a spreadsheet
• SORTRDEV – to sort by real device address (default)
• SORTVOLSER – to sort by the volume serial number
• SORTMFG – to sort by the disk manufacturer (z/VM 6.2 and later)
• SORTCYLS – to sort by the number of cylinders
• DESCENDING – to change the sort order from ascending to descending - it should also be noted that a secondary sort order can be specified by following the first SORT* option with a second one

Determining the type of VTOC on volumes

DASD volumes can have different Volume Table of Contents (VTOCs), depending on whether they were formatted on z/VM or z/OS.

• A z/OS-style VTOC starts on cylinder 0, track 1, record 1, with a size of 14 tracks
• A z/VM-style VTOC starts on cylinder 0, track 0, record 5

If you want to SWAP volumes from z/VM with z/OS-style VTOCs, one of two approaches is recommended.

1.  If you are in a position to rewrite the z/OS-style VTOCs to z/VM style, format cylinder 0 of each volume to be migrated with the z/VM CPFMTXA command.
2.  If you are not able to rewrite the VTOCs, add a SELECT statement after all MOUNT statements in the SWAP task for all volumes to be migrated. For example:
   MOUNT VOL=LX4201,SWAPUNIT=6201
   SELECT FROM(CYL=0),TO(CYL=65519)

The ending cylinder value must be as large as or larger than the highest cylinder number on the largest DASD to be swapped; 65519 as shown handles any DASD up to the size of a 3390-54. If you have EAV volumes larger than this, contact BMC Support for the proper values for the SELECT statement. Do not include z/OS volumes in a run with this MOUNT statement. For more detailed information see the FDRPAS user manual.

To determine which types of VTOCs your volumes have, the DDR command with the TYPE subcommand can be used. For convenience, a small tool named QLABEL EXEC has been made available that utilized the DDR command. To query volumes, they must first be ATTACHed to the virtual machine you are logged on to. Following is an example of using the EXEC against a string of 15 volumes.

The output shows that the DASD volume at real device address 464D has a z/OS-style VTOC, and a warning that the SELECT statement is recommended.

The QLABEL EXEC is provided on the FDRMAINT 191 disk. If you do not yet have FDRPASVM installed, you can download a copy of it from the Additional Resources area for FDRPASVM from BMC Support.