Optical Disk Page-Level Access

This section covers the drivers that enable page-level access and explains how page-level access works.
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This section covers the drivers that enable page-level access and explains how page-level access works.
Drivers
Page-level access is currently available with the following drivers:
  • SARD2D00 driver for IBM DASD Emulation Optical devices (including the IBM ESA/370 and ESA/390 3995 Optical Library Dataserver, model 153)
  • SARD2D03 driver for the FileTek Storage Machine
  • SARD2D04 driver for the Kodak Optistar Storage System
  • SARD2D05 driver for OAM devices (including the IBM ESA/370 and ESA/390 3995 Optical Library Dataserver, model 132)
Page-Level Access Functionality
This functionality lets you do the following:
  • Access archived SYSOUT data directly from optical disk secondary storage
    Page-level access is different than report-level access which requires an entire SYSOUT to be loaded into the CA View database for viewing.
    This capability helps you reduce the DASD load at your site while minimizing the performance impact of the slightly slower access speed of optical disk. Instead of loading a 100,000-line report back to the CA View database, you can view or print just the data you need.
 
  • Add indexes to your SYSOUT archives at archive time
    The optical disk interface uses the user-defined indexes to reduce optical disk access time. Using indexes minimizes the performance impact of the slightly slower access speed of optical disk.
    The net result is that, depending on your indexing and the number of concurrent access requests to optical disk, the response time can be the same as primary storage.
Operation
With page-level access, you can add indexes to your SYSOUT archives at archive time. The optical disk interface uses these user-defined indexes to reduce optical disk access time, minimizing the performance impact of the slightly slower access speed of optical disk. The net result is that, depending on your indexing and the number of concurrent access requests to optical disk, the response time can be indistinguishable from viewing records from primary storage.