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For the Physical Volume Status Pool request, xx  specifies the pool for which the data is to be returned. If no physical volumes are assigned to the specified pool, that issue is indicated in the response record. Data can be requested for pools 0 - 32. 

For the Cloud Volume Map request, if the total number of cloud volume map entries exceeds 4 million, the use of xx  can provide the next 4 million entries. For example, when ‘0’ is specified (which is equivalent to no xx ), the first million entries that are ordered by volser are provided in response. 

For point-in-time and historical statistics requests, any other characters that are provided in the request record past the request itself are retained in the response data, but otherwise ignored. In a TS7700 grid configuration, the request volume must be valid on only the specific cluster from which the data is to be obtained. 

Use a specific MC that includes a copy policy that is defined to indicate that only the wanted cluster is to have a copy of the data. By ensuring that a sole copy of the request volume exists, any virtual device address on any of the clusters in the same grid configuration can be used to request and access the data. It is not necessary for host connectivity to exist to the specific cluster. If an MC is used that indicates that more than one cluster is to include a valid copy of the request volume, unpredictable response data results can occur. 

## 11.4.4 BVIR Response data format 

When the request data set was written to the volume and then closed and unmounted, the TS7700 validates the contents of the request volume when mounted again and appends the requested data records to the data set. 

Human-readable appended records can vary in length, depending on the reports that are requested and can be 80 - 900 bytes. Binary data appended records can be variable in length of up to 24,000 bytes. The data set is now a response data set. The appropriate block counts in the end of file (EOF) records are updated to reflect the total number of records that are written to the volume. 

These records contain the specific response records based on the request. If the request cannot be understood or was invalid, that issue is indicated. The record length is fixed; the record length of each response data is listed in Table 11-4. 

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