StorageTek 6 manual Media Type and Recording Technique Considerations, Volume Report

Volume Report

The volume location information in this report is accurate only up to the time that the volume information is read from the database. For recovery purposes, a listing from a Volume Report run, while the HSC is down on all hosts, must be used to assist locating the required volumes.

Note: Volume movement occurs as a result of:

•mount activity, dismount activity, enter activity, or eject activity

•invoking the Scratch Redistribution utility

•invoking the MOVe command or utility.

Media Type and Recording Technique Considerations

Volume reports can display media type (MEDia) and recording technique (RECtech).

MEDia data is extracted from either the CDS volume attribute record (VAR) or the VOLATTR statements. The VAR media information is updated when the volume external media label is read by the robotic vision system and is transmitted back to the HSC through the LMU. This can occur as a result of mounts, CAP enters, or audits.

RECtech is extracted from the VOLATTR statement. If the VOLATTR statement does not contain the recording technique for the volume, or if the VOLATTR media value conflicts with the media value that is present in the VAR, the RECtech value is Protected determined from the MEDia value that is being reported. This RECtech value will include all recording techniques that the reported MEDia value allows (e.g., if the media value is Standard and the recording technique value defaults to LONGItud, then 18track, 36track, 36Atrack, 36Btrack, and 36Ctrack recording techniques also are included).

The report indicates if the VAR media type has been verified by the LMU. If the LMU verified the media type, the VAR media value is reported. If the media type has not been verified by the LMU, the VOLATTR MEDia value is used if it exists. If both VOLATTR and VAR media type information do not exist, the volume is considered to be Standard. At a minimum, a VOLATTR statement must be present for all volumes that are not Standard cartridges. This is because:

•the vision system cannot recognize two-tone (ECART) cartridges without an external media label

Note: It is recommended that users provide an external media label for all ECARTs. ZCART, DD3, and STK1 media must have external labels.

•for scratch purposes, volume categorization occurs based on the media type. Therefore, it is extremely important that accurate VOLATTRs be defined to maintain accurate scratch counts.

Run the Volume Report utility to verify that your VOLATTR statements and the VARs are in agreement.

To determine which volumes are mismatched between the VAR and the VOLATTR statements, specify either INCLUDE(NONMEDEQ) or EXCLUDE(MEDEQUAL) in the Volume Report syntax. Refer to the syntax and parameter descriptions sections of this utility for more information.

Chapter 4. Utility Functions 325

1st ed., 6/30/04 - 312579601