Appendix B ContentDirector Limits
© 2017 Harmonic Inc. All rights reserved. 330 Harmonic MediaGrid Release 4.1
Resource Limits
Resource Limits
Harmonic MediaGrid 3.1 or later manages resources in three different resource pools:
FileTable Nodes
SliceTable Slices
Dynamic Memory Pools
Note that with 3.1 or later, Harmonic MediaGrid does not restrict file counts to the limits
described in this section but does generate alerts as described in Monitoring Resource Consumption.
If a new file or directory fits within the number of FileTable nodes and there is room for the
resources needed within the dynamic memory pools, then new files and directories can be
created.
FileTable Nodes
FileTable node resources are used for named object in the files system including files, directories,
hard links, and symlinks. In Harmonic MediaGrid 3.1 or later, typical named objects with modestly
long names and ACLs take 1 node per object.
NOTE: In Harmonic MediaGrid 3.1 or later, directories typically consume 1 node plus additional data
structures allocated from the dynamic memory pools. This is different than earlier releases where
directories consumed more FileTable space.
SliceTable Slices
Harmonic MediaGrid 3.1 or later manages the size of its SliceTable in terms of the count of
distinct slices. In systems using replication, the SliceTable only counts 1 for all copies of a slice.
Dynamic Memory Pools
Harmonic MediaGrid ContentDirector software makes use of a number of internal data structures.
These are dynamically allocated from separate pools of memory. The total amount of memory
across all pools is limited and the total amount used determines when to send generate a
SystemManager alarm.
Both the total memory across all pools and the usage of each pool is reported periodically in the
mdscore log.
Resource Limits
The Harmonic MediaGrid 3.1 or later factory settings for resource limits are determined to
provide enough resources to reach the Capacity Specifications under the same conservative
assumptions.
Table B–3 shows the Harmonic MediaGrid 3.1 or later factory settings for resource limits for each
type of ContentDirector.
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