09004 Volume Free Space is Fragmented
Identifies when the number of areas of free
space on a volume exceeds a specified level.
rm
FILE: VOA Volume Allocation File SAS FILE NAME: DETAIL.VCAVOA01 SOURCE LOCATION: prefix.MICS.USER.SOURCE(DYVCAEXC) SEVERITY: Warning (SEVERITY='W') MANAGEMENT AREA: Performance (MGMTAREA='PERFORMANCE') PURPOSE: Identifies when the number of areas of free space on a volume exceeds a specified level. RATIONALE: Allocation of data sets on a volume can be impacted by the level of free space fragmentation. The probability of allocating large primary requests in a single extent can be greatly reduced, resulting in the allocation of data sets over several non-contiguous extents. This can result in poorer performance for the data sets affected. DEFINITION: This exception is detected when the computed fragmentation index (VOAFRAGX) exceeds the specified maximum. EXCEPTION STATEMENTS: The SAS statements identifying the exception situation and describing the condition are stored in the source member named in SOURCE LOCATION and are described below: /*---------------------------------------------------------*/ /* */ /* 09004 */ /* VOLUME FREE SPACE IS FRAGMENTED */ /* */ /*---------------------------------------------------------*/ IF VOAFRAGX GE #fragx THEN DO; EXCCODE='09004'; SEVERITY='W'; MGMTAREA='PERFORMANCE'; EXCDESC1='VOLUME FREE SPACE IS FRAGMENTED'; EXCDESC2='FRAGMENTATION INDEX=' || PUT(VOAFRAGX,5.3) || ', VOL=' || VOLSER; LINK HIT; END; THRESHOLD MODIFICATION: The user should modify the #fragx value according to the following conventions: #fragx - The maximum acceptable index of fragmentation on a volume. Acceptable values are between 0 and 1. A maximum count of .700 would appear as: VOAFRAGX GE .700