Installation guide

9. Restart the system.
When the server restarts, log into Windows as an administrator-level user.
Migrating a cache volume from a flat to a
hierarchical structure
(Topic number: 102251)
3.
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.
Note:
The cache migration tool is included in the MVFCache (Windows) and IMPAXmvfc (Solaris)
packages, which are part of the standard IMPAX install packages.
To migrate a cache volume from a flat to a hierarchical structure
1. At a command prompt on the system where the cache volume is local, type
cache_migration.exe [-S source_cache_volume -D destination_cache_volume -X
delay_in_seconds -F number_of_files -T number_of_threads -I time_in_minutes -f log_file]
Default valueValuesParameters
Not applicable. If
not specified, you
The cache volume to migrate from. If the
destination volume is different from the
-S source_cache_volume
are prompted to
choose from a list.
source volume, ensure that the source cache
volume is closed before running the
cache-migration tool. When closed, new
images cannot be received by this volume,
which will likely be removed after the
migration.
AS300 Upgrade Guide—IMPAX 5.2 or 5.3 to IMPAX 6.5.3 53
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