This example shows how to use the DEFRAG line operator to reduce
the free space fragmentation of a DASD volume.
- Enter the DEFRAG line operator in the line operator column next
to the item in the DASD volume list that you are interested in, as
shown in Figure 1.
Figure 1. Defragmenting a Volume Panel List Utilities Scroll Help
--------------------------------------------------------------------------------
VOLUME LIST
Command ===> Scroll ===> PAGE
Entries 1-10 of 10
Enter Line Operators below: Data Columns 3-8 of 43
LINE VOLUME FREE % ALLOC FRAG LARGEST FREE
OPERATOR SERIAL SPACE FREE SPACE INDEX EXTENT EXTENTS
---(1)---- -(2)-- ---(3)--- -(4) ---(5)--- -(6)- ---(7)--- --(8)--
defrag HSM920 644498K 23 2127002K 356 82174K 31
HSM921 752513K 27 2018987K 264 501122K 263
HSM922 825336K 30 1946164K 230 406996K 38
HSM923 735581K 27 2035919K 207 436158K 45
HSM924 860861K 31 1910639K 191 555241K 35
HSM925 827604K 30 1943896K 115 659051K 28
USER00 288300K 10 2483200K 28 277344K 27
USER01 819415K 30 1952085K 307 297984K 51
1P0302 835241K 30 1936259K 178 540355K 39
1P0303 791913K 29 1979587K 290 298593K 43
- Press the ENTER key. ISMF displays the DEFRAG Entry Panel as shown
in Figure 2.
Figure 2. Completing the DEFRAG Entry Panel Panel Utilities Scroll Help
------------------------------------------------------------------------------
DEFRAG ENTRY PANEL Page 1 of 2
Command ===>
Optionally Specify One or More for Volume: USER01
To Control Obtaining Access to Volume, Specify:
Maximum Number of Retries . . . . . . 2 (0 to 99)
Number of Seconds Between Retries . . 2 (0 to 255)
Password Dsn . .
To Conditionally Perform Defrag, Specify:
Minimum Fragmentation Index . . . (0 to 999)
Debug(FRmsg) . . . . . . . . . (M=Min, S=Sum, D=Detailed or blank)
Trace . . . . . . . . . . . (Y or N)
Fastreplicate . . . . . . . . (R=Required, P=Preferred, N=None or blank)
No of Free Tracks Required in a Contiguous Area (1 to 999999)
% of Free Tracks Required in a Contiguous Area . . (1 to 99)
No of Passes to Assemble the Above Tracks . . . . 1 (1 to 99)
Time Delay between the Passes . . . . . . . . . . 999 (0 to 9999)
Process Checkpointed Data Sets . . . . . . . . . . (0-255,or Blank)
Use ENTER to Perform DEFRAG;Use DOWN Command to View next Panel;
Use HELP Command for Help; Use END Command to Exit.
Complete the DEFRAG Entry Panel with the values shown.
- Press the ENTER key. ISMF submits the job and redisplays the list,
as shown in Figure 3. The asterisk next to
the DEFRAG line operator in the line operator column indicates that
the operation has completed successfully.
Figure 3. Successful Submission of the
DEFRAG Line Operator Panel List Utilities Scroll Help
--------------------------------------------------------------------------------
VOLUME LIST
Command ===> Scroll ===> PAGE
Entries 1-10 of 10
Enter Line Operators below: Data Columns 3-8 of 43
LINE VOLUME FREE % ALLOC FRAG LARGEST FREE
OPERATOR SERIAL SPACE FREE SPACE INDEX EXTENT EXTENTS
---(1)---- -(2)-- ---(3)--- -(4) ---(5)--- -(6)- ---(7)--- --(8)--
*DEFRAG HSM920 644498K 23 2127002K 356 82174K 31
HSM921 752513K 27 2018987K 264 501122K 263
HSM922 825336K 30 1946164K 230 406996K 38
HSM923 735581K 27 2035919K 207 436158K 45
HSM924 860861K 31 1910639K 191 555241K 35
HSM925 827604K 30 1943896K 115 659051K 28
USER00 288300K 10 2483200K 28 277344K 27
USER01 819415K 30 1952085K 307 297984K 51
1P0302 835241K 30 1936259K 178 540355K 39
1P0303 791913K 29 1979587K 290 298593K 43
z/OS DFSMS Using the Interactive Storage Management Facility
Copyright IBM Corporation 1990, 2014