09003 High Alternate Track Usage

Identifies when the number of assigned alternate tracks on a volume exceeds a specified level.
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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 assigned alternate tracks on a volume exceeds a specified level. RATIONALE: DASD performance can be significantly degraded when data is stored on an alternate track due to a defective primary track. The extra disk access along with the necessity to reposition the access mechanism will result in increased data access times. Also, high assignments of alternate tracks can be an early indication of a failing disk assembly. DEFINITION: This exception is detected when the count of assigned alternate tracks (VOAALNTK) 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: /*---------------------------------------------------------*/ /* */ /* 09003 */ /* HIGH ALTERNATE TRACK USAGE */ /* */ /*---------------------------------------------------------*/ IF VOANOATK GT #usedalt THEN DO; EXCCODE='09003'; SEVERITY='W'; MGMTAREA='PERFORMANCE'; EXCDESC1='HIGH ASSIGNMENT OF ALTERNATE TRACKS'; EXCDESC2='ALTERNATE TRACKS USED=' || PUT(VOANOATK,3.) || ', VOL=' || VOLSER; LINK HIT; END; THRESHOLD MODIFICATION: The user should modify the #usedalt value according to the following conventions: #usedalt - The maximum acceptable number of assigned alternate tracks. A maximum count of 5 would appear as: VOANOATK GT 5