Grass Valley iTX System v.2.6 - Manual (Page 262)

The Media Cache Service
If the location is one that iTX can play out the media file from, the event status in the Schedule
Grid changes to Ready; the event shows the search folder in the remote domain as the media-
file location; the cache-status indicator shows orange [  ]. If the location is an archive, the
event status in the Schedule Grid stays Not Ready; the event shows the search folder in the
remote domain as the media-file location; the cache-status indicator shows blue [  ].
As in a single-domain system, the Media Cache Service uses the local Media Watcher to copy
the file from the search folder in the remote domain to the local domain. Depending on the
search-folder configuration, the Media Watcher copies the file to either an iTX Media Store or
the cache. See earlier in this section, "Caching from a search folder".
Caching for a sub-channel
When you set up a sub-channel (e.g. for playing out schedules in a regional channel), you install
a Media Cache Service on the Output Server machine for the sub-channel. This service then
manages the cache for the sub-channel.
Only the locally required content, i.e. media files for events that are played out only in the sub-
channel, is stored in the sub-channel cache.
The cache on the main Output Server machine, managed by the Media Cache Service on that
machine, holds the content for the main channel.
Search order of domains in multi-domain caching
In multi-domain caching, both TXPlay and the Media Cache Service use the OPUS 2 Service to
search remote domains. This service searches the domains in a particular order until it finds
required media items.
You specify this order – for both TXPlay and the Media Cache Service – in a multi-domain
configuration panel.
For Output Server 1, the panel appears in the Engineering layout, under Channel Config > Cache
Settings (with a cache channel selected)
For Output Server 2, the panel appears on the Configuration tab of the Media Cache 2 user
interface. See “Media Cache 2 - Configuration tab” on page 265
The panel for TXPlay appears under the TX Channel Automation Config tab for the playout
channel; that for the Media Cache Service, under the Cache Settings tab for the cache channel.
The domains in the Selected Domains pane must be the same, and in the same order, for both
services.
March 2015 System Administrator Guide Page 262 of 404