CA Dynam for VSE User Guide
CA Dynam for VSE User Guide CA Dynam for VSE User Guide
IBM Virtual Tape Facility (VTAPE) Support Normally, CA Dynam/T scans all available tape drives searching for a scratch tape to use when creating a data set on a real tape. Unlike real tapes, when a virtual tape is requested for output, CA Dynam/T must search the Dynam catalog for an appropriate virtual volser to specify on either the VTAPE START command or in the special FakeTape mount CCW request. If a volume is to be selected by CA Dynam/T for use as a virtual volume, the volser must be defined in the Dynam catalog as a virtual scratch tape. Define Virtual Volumes The DYNCAT SCRPOOL command is used to define virtual volumes in the catalog. Specifying either the VIRTAPE=VTAPE/FTAPE parameter, or the VTAPLOC=‘location’ and VTAPFILE=‘filename’ parameters on the SCRPOOL command, will define the volumes as virtual scratch tapes. The VTAPLOC and VTAPFILE parameters must be specified together and are mutually exclusive with the VIRTAPE parameter. The VTAPLOC and VTAPFILE parameters define the location and file name where the file is to be created. This virtual tape information is stored in the catalog when the SCRPOOL command is processed. If a VTAPE volume is being defined, specify VTAPLOC=‘VSAM’ or VTAPLOC=‘ipaddress:portnumber’. If a FakeTape volume is being defined, specify VTAPLOC=‘FTAPE’. If VIRTAPE=FTAPE or VIRTAPE=VTAPE is specified on the SCRPOOL command, the default file name and location defined in the DTVIRT option record will be passed on the VTAPE START command or in the FakeTape CCW when the data set is opened. The virtual tape information associated with a volume remains intact unless the volume is deleted from the catalog, or if a SCRPOOL command is issued with new virtual tape information specified. The virtual tape information remains associated with the volume even after the virtual volume is scratched. Virtual tape volumes do not need to be pre-initialized. CA Dynam/T writes the VOL1 and HDR1 labels the first time the virtual volume is used to create an output file. If a particular data set should always be created on a virtual volume, specify VIRTAPE=FTAPE or VIRTAPE=VTAPE on the DYNCAT DEFINE or ALTER command. To create a controlled version on a virtual tape on an as-needed basis, specify the TLBL option VT for a VTAPE, or FT for a FakeTape. Specifying the TLBL option causes a virtual tape to be created regardless of the VIRTAPE specification for the data set. 3–58 User Guide
IBM Virtual Tape Facility (VTAPE) Support If CA Dynam/T automatically creates a virtual tape, the logical unit must be unassigned when a single file or the first file of a multi-file set is opened. If the logical unit is preassigned, message CADT107D is issued. At that point, the operator can either release the assignment by replying 'REL' to the CADT107D message or cancel the job. The only time the logical unit can be preassigned is if other than file one of a multi-file set is being opened and the previous file used the HOLD option. See the section entitled "IBM limitation when writing to VSAM Virtual Tapes" for more information and an example on how to create multi-file VSAM VTAPE files. Precautions for Virtual Tapes The following precautions need to be taken when using virtual tapes: • Due to a conflict between the JCLIF macro interface and POWER, do not create or read POFFLOAD tapes using the automatic VTAPE interface. • To prevent simultaneous use, CA Dynam/T locks virtual CUUs. An internal method of locking is used, which requires no additional setup or options to be set. To unlock a virtual CUU that remains locked due to cancellation or abnormal termination of a job, use the new AR command DT READY VCUU=cuu. The AR command DT STATUS shows NOT AVRABLE next to any virtual CUU currently in locked status. • To reduce the amount of I/O when searching the catalog for an eligible virtual scratch tape, specify the VOLID parameter for data sets that are to be written to virtual tapes. If a data set is defined with a VOLID, CA Dynam/T performs a generic search looking only for volumes where the first two characters match the specified VOLID. For example, if there are no eligible virtual scratch tapes in the catalog, and no VOLID is specified, every volume in the catalog will be accessed. However, if a VOLID is specified, then only the volumes whose first two characters match the VOLID will be accessed. Using the VOLID parameter limits searches only to virtual volumes, thus reducing unnecessary catalog I/O. • To use VSAM and FakeTape files as virtual tapes, you must define them before they can be used by CA Dynam/T. For details about defining files to be used as virtual tapes, see IBM or FakeTape documentation. Example The following is an example of how to create and read a VTAPE that will reside in a VSAM file: * $$ JOB JNM=VTAPE,CLASS=0,DISP=D // JOB VTAPE CREATE VIRTUAL TAPE FILE * STEP 1 - DEFINE VTAPE VSAM CLUSTER // EXEC IDCAMS,SIZE=AUTO DELETE (VTAPE.FILE) PURGE CL - CATALOG(VSAM.USER.CATALOG) DEFINE CLUSTER (NAME(VTAPE.FILE) - Chapter 3: Supporting Tape File Management 3–59
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IBM Virtual Tape Facility (VTAPE) Support<br />
Normally, <strong>CA</strong> <strong>Dynam</strong>/T scans all available tape drives searching <strong>for</strong> a scratch<br />
tape to use when creating a data set on a real tape. Unlike real tapes, when a<br />
virtual tape is requested <strong>for</strong> output, <strong>CA</strong> <strong>Dynam</strong>/T must search the <strong>Dynam</strong><br />
catalog <strong>for</strong> an appropriate virtual volser to specify on either the VTAPE START<br />
command or in the special FakeTape mount CCW request. If a volume is to be<br />
selected by <strong>CA</strong> <strong>Dynam</strong>/T <strong>for</strong> use as a virtual volume, the volser must be<br />
defined in the <strong>Dynam</strong> catalog as a virtual scratch tape.<br />
Define Virtual Volumes<br />
The DYN<strong>CA</strong>T SCRPOOL command is used to define virtual volumes in the<br />
catalog. Specifying either the VIRTAPE=VTAPE/FTAPE parameter, or the<br />
VTAPLOC=‘location’ and VTAPFILE=‘filename’ parameters on the SCRPOOL<br />
command, will define the volumes as virtual scratch tapes. The VTAPLOC and<br />
VTAPFILE parameters must be specified together and are mutually exclusive<br />
with the VIRTAPE parameter. The VTAPLOC and VTAPFILE parameters define<br />
the location and file name where the file is to be created. This virtual tape<br />
in<strong>for</strong>mation is stored in the catalog when the SCRPOOL command is processed.<br />
If a VTAPE volume is being defined, specify VTAPLOC=‘VSAM’ or<br />
VTAPLOC=‘ipaddress:portnumber’. If a FakeTape volume is being defined,<br />
specify VTAPLOC=‘FTAPE’.<br />
If VIRTAPE=FTAPE or VIRTAPE=VTAPE is specified on the SCRPOOL command,<br />
the default file name and location defined in the DTVIRT option record will be<br />
passed on the VTAPE START command or in the FakeTape CCW when the<br />
data set is opened.<br />
The virtual tape in<strong>for</strong>mation associated with a volume remains intact unless<br />
the volume is deleted from the catalog, or if a SCRPOOL command is issued<br />
with new virtual tape in<strong>for</strong>mation specified. The virtual tape in<strong>for</strong>mation<br />
remains associated with the volume even after the virtual volume is scratched.<br />
Virtual tape volumes do not need to be pre-initialized. <strong>CA</strong> <strong>Dynam</strong>/T writes the<br />
VOL1 and HDR1 labels the first time the virtual volume is used to create an<br />
output file.<br />
If a particular data set should always be created on a virtual volume, specify<br />
VIRTAPE=FTAPE or VIRTAPE=VTAPE on the DYN<strong>CA</strong>T DEFINE or ALTER<br />
command. To create a controlled version on a virtual tape on an as-needed<br />
basis, specify the TLBL option VT <strong>for</strong> a VTAPE, or FT <strong>for</strong> a FakeTape. Specifying<br />
the TLBL option causes a virtual tape to be created regardless of the VIRTAPE<br />
specification <strong>for</strong> the data set.<br />
3–58 <strong>User</strong> <strong>Guide</strong>
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