December 2006
Intermediate to advanced
228 pages
6h 20m
English
book
Introduction to the New Mainframe: Large-Scale Commercial Computing
by Mike Ebbers, Pilar Gonzalez Adrados, Frank Byrne, Rodney Martin, Jon Veilleux
Content preview from Introduction to the New Mainframe: Large-Scale Commercial Computing
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124 Introduction to the New Mainframe: Large-Scale Commercial Computing
In DFSMS, there can be multiple migration levels. These are known as migration
level one (ML1) and migration level two (ML2). In most cases, data that has gone
unreferenced for a period of time is migrated to ML1. If the data remains
unreferenced on ML1 for a preset period of time, then migration to ML2 occurs
and the data is moved to an even lower cost per byte medium such as tape.
If a particularly aggressive view is taken, then a file can go straight to ML2 status,
bypassing ML1. If the data is referenced while in either ML1 or ML2 status, then it
is automatically returned to the user disk volume (recalled) where it can be
accessed by a user or application. Recall can ...
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