Installation guide

6
Post-upgrade checking
and stabilization
Some tasks are performed after the 6.5.3 upgrade is complete.
Migrating a cache volume from a flat to a
hierarchical structure
(Topic number: 102251)
1.
Important!
If upgrading from IMPAX 6.5 or later, the caches may have already been migrated to a
hierarchical structure; this task can then be skipped.
Before starting the migration, verify the condition of the caches:
1. Install the MVFcachecheck package.
2. Run the mvf-clean-cache tool.
3. If the mvf-clean-cache output indicates that there are problems, resolve them.
IMPAX stores DICOM objects in cache so that they can be displayed, transmitted to other DICOM
devices, and archived. Prior to IMPAX 6.5, the cache structure was flat (each cache volume contained
one directory), which limited the cache size, because once a certain number of objects were in the
directory, access to the cache could become slow. Large sites have resolved this by deploying numerous
cache volumes, which can be difficult to manage.
As of IMPAX 6.5, a hierarchical cache structure is supported for image and web caches, permitting
larger cache volumes. The old flat cache structure continues to be supported; only new images
arriving in the system or existing images retrieved from archive are written to cache using the
hierarchical structure. However, the cache migration tool allows a site to migrate its existing caches
to this hierarchy if it would like to immediately take advantage of the hierarchical structure.
AS300 Upgrade and DAA Consolidation Guide—IMPAX 6.2 or 6.3 to IMPAX 6.5.3 52
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