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Harmonic MediaGrid Release 4.1
Appendix B
ContentDirector Limits
This section contains information about limitations of each model of ContentDirector, including
the following topics:
Monitoring Resource Consumption
CAUTION:
If you do not understand the procedures or recommendations described in this chapter, please
consult with Technical Support before proceeding.
Overview
Harmonic MediaGrid release 3.1 introduced enforced limits on file system capacities in
ContentDirectors in order to provide graceful handling when limits are reached as well as
advanced notification via SystemManager alerts as limits are approached. ContentDirector limits
are fixed based upon the hardware model and set automatically during installation of or upgrade
to Harmonic MediaGrid release 3.1 and later.
This section provides an explanation of the implementation of ContentDirector limits in Harmonic
MediaGrid 3.1 and later as well as information needed to plan the capacity and monitor resource
consumption of Harmonic MediaGrid system.
Capacity Specifications and Resource Limits
Note the following distinction between “capacity specifications” and “resource limits:”
are useful for choosing the model of ContentDirector needed for a
system and for estimating the capacity of the system. The specifications included in this
section have been made using conservative and realistic assumptions regarding things like
the distribution of file name lengths, average numbers of files per directory, number of
concurrently open files, number and length of ACLs, etc.
are tied to the resources needed (memory, disk, internal data structures, etc.)
under the actual workload. Resource limits are enforced upon actual usage and it is most
useful to monitor actual resource consumption.
Capacity Specifications
In terms of capacity, Harmonic MediaGrid systems are specified by:
Storage capacity
: the amount of usable data that can be stored.
File count
: the number of files that can be stored in the file system. In Harmonic MediaGrid
this includes regular files and symlinks but not hard links.
Directory count
: the number of directories that can be stored in the file system.