
Onloading and Restoring Datasets (TSIDONL)
13-32 User Reference
Connectivity Systems, Inc.—Copyright © 2006
Use Pursuant to Company Instructions
Onload versus
Restore
The following scenario describes the differences between TSIDONL
Onload and TSIDONL Restore.
Suppose you have a dataset named DATASET.A with the following
information in the BIM-EPIC Catalog.
An Absolute Generation Number (AGN) is a one-up number assigned to a
disk-resident version by BIM-EPIC at the time the version is created.
Version numbers change as a version becomes older or if a newer version
is scratched. However, an AGN does not change as long as the version
remains on disk. For example, if version 4 were scratched, version 5
would become version 4 and version 6 would become version 5 but their
AGNs would not change.
In the above table, when version 2 was first created as version 1,
BIM-EPIC assigned AGN 45. The 45 means that this was the 45th time a
version of this dataset was created to the BIM-EPIC catalog. The next
time a version 1 for this dataset is created, the version will be assigned an
AGN of 46, the next AGN will be 47, and so on.
Suppose version 3 through version 6 were offloaded to tape by TSIDOFL.
Now DATASET.A contains the following:
Version information still exists in DATASET.A for version 3 through
version 6. However, now those versions display as tape datasets instead of
disk. Version 3 through version 6 are still available for scratching,
assuming all retention criteria have been met, even though the versions
have been offloaded.
Version
Number
Absolute Generation
Number (AGN)
Location
1 46 Disk
2 45 Disk
3 44 Disk
4 43 Disk
5 42 Disk
6 41 Disk
Version
Absolute Generation
Number (AGN)
Location
1 46 Disk
2 45 Disk
3 44 Tape
4 43 Tape
5 42 Tape
6 41 Tape
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