Installation guide

Understanding IMPAX image and web caches
When images are sent into IMPAX from an acquisition station or retrieved from an archive, they must
be stored temporarily in an accessible location. This temporary storage area is called a cache. A cache
is a set of directories on local or external hard disks.
IMPAX supports two types of caches: image and web. The image cache contains what in the IMPAX
Client is called original images—the images as they are sent from the acquisition station. The web cache
contains copies of the original images that have been compressed with wavelet encoding by the Curator
component. In many cases, the version of image in web cache is faster for Clients to load.
You use the Cache Manager in Administration Tools to create cache volumes on stations and to set the
priority for cache usage. The archive must have at least one cache it can use. If using the Curator
component, it requires at least one web cache.
Creating a cache volume
Use the Cache Manager to specify partitions or subdirectories on stations to use as image cache or web
cache. You can create cache volumes only from the server where the Administration Tools are installed;
you cannot do so remotely through a browser login.
To create a cache volume
1. On the Daily tab, click Cache Manager.
2. Click New Cache Volume.
3. In the Add Volume dialog, select the Volume Type to create: Image Cache or Web Cache.
4. From the Station list, select the station to set up the cache on.
For a web cache, select the station that the master Curator runs on.
5. In the Path field, type the path for the new cache volume.
You must specify the cache locations using UNC paths.
6. Click Add.
7. In the Warning dialog, verify that the path is correct and click Yes.
8. To select the cache volume to fill with images first, click Increase Priority or Decrease
Priority.
9. If the cache volume is hosted remotely or if you are setting up network area storage (NAS), after
the cache is created, create a user account for the ImpaxServerUser on the system hosting the
cache and give the ImpaxServerUser full read, write, and execute permissions on the cache folder.
For details, refer to “Configuring web cache folder permissions” in the IMPAX 6.3 Curator and CD
Export Server Installation Guide.
Considerations when defining the cache volume path
IMPAX 6.3 AS300 Configuration Guide 14