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Snapshot template options for software snapshots

To enable XBM and SUF to perform software snapshots, you must specify a snapshot template. These options are available on the Snapshot Managed Object Information panel.

Snapshot Managed Object Information panel

Cache limit

Specify the cache limit for the snapshot template: ___________________

  • This amount can be defined in kilobytes (KB), megabytes (MB), gigabytes (GB), terabytes (TB), petabytes (PB), or exabytes (EB). The range is from 0 to 8191 PB or 7 EB.
  • When setting the limit, consider the amount of update activity that typically affects objects after your utility establishes a point of consistency. Setting the cache limit too low could cause the preimage copy of an updated page to be unavailable for processing by the utility. However, because pages are released as they are copied, the cache does not need to hold all preimage pages; it needs to accommodate only those pages that will be copied concurrently.
  • When running a restartable Snapshot Copy job, you should specify a higher cache limit than normal. You need a larger cache because XBM continues to cache targeted data sets until the job successfully completes or you terminate the job for each targeted data set. A normal-sized cache might work well for a restartable Snapshot Copy job that requires no restart, but if several restarts are required, the same cache can fill, leaving no space for preimages.

Note

XBM applies the snapshot template values to each data set when the snapshot is initiated. The cache limit is the maximum amount of the cache that the snapped data set can occupy.

Compression

Specify whether you want to use compression for the template: ___________________

  • Valid values are 1 (Compression) and 2 (No compression). The default value is 2 (No compression).
  • Freespace compression is available for snapshot utility object definitions. For more information, see Using-compression.

Cache type

Specify the type of cache that you want to use for the template: ___________________

  • The valid values are 1 (None), 2 (Any), 3 (Fixed Virtual), 4 (Paged Virtual), 5 (Data Space), and 6 (Hiperspace).

  • BMC recommends that you use data space for snapshot templates. ESO hiperspace is not recommended because the system can steal pages, causing the preimage copy of an updated page to be unavailable for utility processing.

    Note

    Use of ESO hiperspace is obsolete.

  • Ensure that the configuration that will be active during snapshot utilities processing supports the cache type that you specify.
  • For more information, see Choosing-cache-types.

Related topic

XBM-options


 

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