SMS/Debug has an interface to the SMS device selection process to show why SMS selected a particular volume. The product can examine the candidate volumes and display information about each candidate volume.
The trace messages display volume entries showing the storage group and which list the volume resides in: primary, secondary, or tertiary. The values in the FREE, CAP, and THRESH columns are space in megabytes.
Note: The values are calculated based on the number of tracks
* track size: 47476 for 3380's and 56664 for 3390's.
When
SMSDEBUG=YES has been requested, only information about volumes online
to SMS is displayed. SMSDEBUG=ALL can be used to include information about
offline devices. Note: There is no space information
available for offline devices.
Sample trace output
The following job shows sample output from the DFSMS volume trace facility.
// EXEC PGM=IEFBR14
//DD1 DD DSN=DON.DD1,SPACE=(TRK,1),STORCLAS=STC1,SMSDEBUG=(NOACS,VOL)
//DD2 DD DSN=DON.DD2,SPACE=(TRK,1),STORCLAS=STC1,SMSDEBUG=(NOACS,VOLA)
SMSTRACE=VOLUME
ACC00510-* STARTING TRACE FOR SMS_TRACE-VOLUME, DSN=DON.DD1, VOL=, DD=DD1
ACC03750-* VOLSER STORGRP FLAGS LIST FREE CAP THRESH
ACC03751-* SMS002 STG1 EE9B9BA6 PRI 9 14 6
ACC03751-* SMS004 STG1 649B9BA2 SEC 2 14 0
ACC03751-* SMS001 STG1 649B9BA2 SEC 1 34 0
ACC03751-* SMS003 STG1 649B9BA2 SEC 0 14 0
ACC03752-* SMS SELECTED VOLUME SMS002
SMSTRACE=VOLUMEA
ACC00510-* STARTING TRACE FOR SMS_TRACE-VOLUME, DSN=DON.DD2, VOL=, DD=DD2
ACC03750-* VOLSER STORGRP FLAGS LIST FREE CAP THRESH
ACC03751-* SMS002 STG1 EE9B9BA6 PRI 9 14 6
ACC03751-* SMS004 STG1 649B9BA2 SEC 2 14 0
ACC03751-* SMS001 STG1 649B9BA2 SEC 1 34 0
ACC03751-* SMS003 STG1 649B9BA2 SEC 0 14 0
ACC03751-* SMS901 STG1 0C201804 0 0 0
ACC03751-* SMS902 STG1 0C201804 0 0 0
ACC03751-* SMS903 STG1 0C201804 0 0 0
ACC03751-* SMS904 STG1 0C201804 0 0 0
ACC03751-* SMS905 STG1 0C201804 0 0 0
ACC03751-* SMS908 STG1 0C201804 0 0 0
ACC03751-* SMS909 STG1 0C201804 0 0 0
ACC03752-* SMS SELECTED VOLUME SMS002
Figure 3-4. Sample DFSMS volume trace output