SVTVMR - Virtual Tape Volume Mount Request File

At the DETAIL timespan, the Virtual Tape Volume Mount Request File provides information for virtual tape volume mounts.
micsrm140
The Virtual Tape Volume Mount Request File is derived from the VTSS user SMF record, subtype 13. This record is produced at the time the virtual tape mount is satisfied, i.e.: ready state. This is a key file for analysis of virtual tape mount times, delays in mounts, and buffer hit/miss ratios.

File Organization

The table below identifies data elements by which the file is sequenced and summarized in each timespan. N/A indicates that the file is not supported in a timespan. At the DETAIL level, data is sequenced but not summarized.
The timespans in which a file is supported are defined by each installation when
MICS
is installed. Therefore, this table has been generated as part of the installation process to accurately reflect the
MICS
system at your installation.
SVTVMR Sort Sequence and Data Granularity
+---------+-------------------------------------------------+ |Timespan | Level of Data Granularity | +---------+-------------------------------------------------+ | | | | DETAIL |SYSID VTSSID VTSSHST VTSSMCL YEAR | | |MONTH DAY HOUR ENDTS | | | | | DAYS |SYSID VTSSID VTSSHST VTSSMCL YEAR | | |MONTH DAY HOUR | | | | | WEEKS |SYSID VTSSID VTSSHST VTSSMCL YEAR | | |MONTH WEEK ZONE HOUR | | | | | MONTHS |SYSID VTSSID VTSSHST VTSSMCL YEAR | | |MONTH ZONE | | | | YEARS | N/A | | | | +---------+-------------------------------------------------+ | TABLES | N/A | +---------+-------------------------------------------------+ Generation Date: Tue, May 12, 2009

Data Elements List

The table below identifies data elements contained in this file.
GENERATION DATE: Tue, May 12, 2009 Note: Essential data elements are identified by an "E" under the Timespan asterisk (*) column.. Time- Data Data Element Span * Element Description (LABEL) ------- -------- ---------------------------------------- Sequence/Summary Data Elements XD....E DAY - Day of Month XDW...E HOUR - Hour of Day XDWM..E MONTH - Month of Year XDWM..E SYSID - System Identifier XDWM..E VTSSHST - Originating Host Name XDWM..E VTSSID - VTSS ID XDWM..E VTSSMCL - VTV Management Class XDW...E WEEK - Week of Year XDWM..E YEAR - Year of Century XDWM..E ZONE - Time Zone Common Data Elements XD....E DAYNAME - Name of Day of Week X.....E DSNAME - Data Set Name XDWM..E ENDTS - End Time Stamp X.....E JOB - Job Identification XDWM..E ORGSYSID - Originating System Identification XDWM..E STARTTS - Start Time Stamp X.....E STEPNAME - Program Step Name XDWM..E SVTVDST1 - Total VTV Mounts within Limit 1 XDWM..E SVTVDST2 - Total VTV Mounts within Limit 2 XDWM..E SVTVDST3 - Total VTV Mounts within Limit 3 XDWM..E SVTVDST4 - Total VTV Mounts within Limit 4 XDWM..E SVTVDST5 - Total VTV Mounts within Limit 5 XDWM..E SVTVDST6 - Total VTV Mounts within Limit 6 XDWM..E SVTVDST7 - Total VTV Mounts within Limit 7 XDWM..E SVTVDST8 - Total VTV Mounts within Limit 8 XDWM..E SVTVVAL1 - VTV Mount Time Distribution Limit 1 XDWM..E SVTVVAL2 - VTV Mount Time Distribution Limit 2 XDWM..E SVTVVAL3 - VTV Mount Time Distribution Limit 3 XDWM..E SVTVVAL4 - VTV Mount Time Distribution Limit 4 XDWM..E SVTVVAL5 - VTV Mount Time Distribution Limit 5 XDWM..E SVTVVAL6 - VTV Mount Time Distribution Limit 6 XDWM..E SVTVVAL7 - VTV Mount Time Distribution Limit 7 X.....E VTSSCTP - Cartridge Type X.....E VTSSDID - VTD Device ID X.....E VTSSVID - VTV Volser ID Retained Data Elements X.....E VMRMET - Mount End Timestamp X.....E VMRMST - Mount Start Timestamp X.....E VMRRCI - Recall Indicator X.....E VMRRWS - Read/Write Status X.....E VMRTIM - VTV Timestamp X.....E VMRVMT - Virtual Mount Type Accumulated Data Elements XDWM..E VMRCOUNT - Total VTV Mounts XDWM..E VMRETM - VTV Specific Mount Time XDWM..E VMREXT - Mount Existing VTV Count XDWM..E VMRHTM - VTV Buffer Hit Mount Time XDWM..E VMRMNR - VTV Mount Without Recall Count XDWM..E VMRMRC - VTV Mount After Recall Count XDWM..E VMRMTM - VTV Mount Time XDWM..E VMRRRO - Mounted Read Only Count XDWM..E VMRRRW - Mounted Read/Write Count XDWM..E VMRSAL - Mount ANSI Label Scratch VTV Count XDWM..E VMRSCTPO - Other cartridge Mounts XDWM..E VMRSECT - 800MB (E) Cartridge Mounts XDWM..E VMRSMT - Total VTV Scratch Mounts XDWM..E VMRSNL - Mount Existing as Scratch VTV Count XDWM..E VMRSSCT - 400MB (S) Cartridge Mounts XDWM..E VMRSSL - Mount SL Scratch VTV Count XDWM..E VMRSTM - VTV Scratch Mount Time XDWM..E VMRS2GB - 2GB Cartridge Mounts XDWM..E VMRS4GB - 4GB Cartridge Mounts XDWM..E VMRVMTOT - Mount Other Count XDWM..E VMRXTM - VTV Buffer Miss Mount Time Minimum Data Elements XDWM..E VMRMNETM - Min VTV Specific Mount Time XDWM..E VMRMNHTM - Min VTV Buffer Hit Mount Time XDWM..E VMRMNMTM - Min VTV Mount Time XDWM..E VMRMNSTM - Min VTV Scratch Mount Time XDWM..E VMRMNXTM - Min VTV Buffer Miss Mount Time Maximum Data Elements XDWM..E VMRMXETM - Max VTV Specific Mount Time XDWM..E VMRMXHTM - Max VTV Buffer Hit Mount Time XDWM..E VMRMXMTM - Max Mount Time XDWM..E VMRMXSTM - Max VTV Scratch Mount Time XDWM..E VMRMXXTM - Max VTV Buffer Miss Mount Time Derived Data Elements XDWM..E VMRAVETM - Avg VTV Specific Mount Time XDWM..E VMRAVHTM - Avg VTV Buffer Hit Mount Time XDWM..E VMRAVMTM - Avg VTV Mount Time XDWM..E VMRAVSTM - Avg VTV Scratch Mount Time XDWM..E VMRAVXTM - Avg VTV Buffer Miss Mount Time XDWM..E VMRPCEXT - Pct Mount Existing VTV XDWM..E VMRPCHIT - VTV Recall Disk Buffer Hit Pct XDWM..E VMRPCMIS - VTV Recall Disk Buffer Miss Pct XDWM..E VMRPCSAL - Pct Mount ANSI Label Scratch VTV XDWM..E VMRPCSNL - Pct Mount Existing as Scratch VTV XDWM..E VMRPCSSL - Pct Mount SL Scratch VTV XDWM..E VMRPCVM1 - Pct Mounted Within Limit 1 XDWM..E VMRPCVM2 - Pct Mounted Within Limit 2 XDWM..E VMRPCVM3 - Pct Mounted Within Limit 3 XDWM..E VMRPCVM4 - Pct Mounted Within Limit 4 XDWM..E VMRPCVM5 - Pct Mounted Within Limit 5 XDWM..E VMRPCVM6 - Pct Mounted Within Limit 6 XDWM..E VMRPCVM7 - Pct Mounted Within Limit 7 XDWM..E VMRPCVM8 - Pct Mounted Within Limit 8
For a detailed description of individual data dictionary elements, see Virtual Tape Volume Mount Activity File (SVTVMR).

Usage Considerations

A primary performance goal for virtual tape subsystems is to satisfy virtual tape accesses in the disk buffer. When virtual tapes must be recalled from physical tape cartridges, performance suffers dramatically. While totally eliminating virtual volume recalls is impossible, recalls should be minimized.
Data in the SVTVMR file can provide insight to assist the storage administrator in adjusting management classes to either keep virtual volumes in the disk buffer longer, or to predict when volumes might be needed; thus forcing them to be recalled in advance so they are resident in the disk buffer when required. Any improvement in minimizing virtual volume recalls increases virtual tape subsystem throughput.

Retrieval Examples

In the examples, a SAS macro variable is used to specify the DDname part of the
MICS
file name. These macro variables are a standard part of
MICS
and are available for all files. The macro variable name has the form &diiit, where d is the database identifier, iii is the information area name, and t is the timespan. For the examples, a database identifier of P is used. The identifier is installation-dependent, so you should find out what the identifiers are at your installation.
  • Generate a report displaying virtual tape mount activity and mount response time by hour.
    %LET BY = SYSID VTSSID VTSSMCL HOUR; %LET BREAK = HOUR; PROC SORT DATA=&psvtx..SVTVMR01 OUT=VMR; BY &BY; RUN; DATA VMR2; SET VMR; %VMRSUM(SUMBY=&BY, SUMBREAK=&BREAK); RUN; PROC PRINT DATA=VMR2 LABEL NOOBS; BY SYSID VTSSID; VAR SYSID VTSSID VTSSMCL HOUR VMRCOUNT VMRMNR VMRMRC VMRAVMTM VMRMNMTM VMRMXMTM; TITLE 'Virtual Tape Mount Activity'; RUN;
    Note:
    Drop management class from the BY and VAR statements to get gross mounts by SYSID and VTSSID.