User`s guide

Bandwidth Management

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Note: The FTP control values must match on both the primary SGI Media Server and the

mirror platform.

The vtr.ftp.procs.max control should be tuned to account for primary

SGI Media Server activity, load, and workﬂow. The following are two possible scenarios

to consider:

• Assume a primary SGI Media Server that has four video codecs with an active clip

mirror. If the value of control vtr.ftp.procs.max is 4 and four video codecs

concurrently ingest video, all four streams will be mirrored simultaneously. In this

case, the values for the controls vtr.clipmirror.max_threads and

vtr.ftp.procs.max should be equal.

• Assume again the same conﬁguration of four concurrent ingest operations but also

that an external source transfers content into the primary SGI Media Server. In this

case, vtr.ftp.procs.max and vtr.clipmirror.max_threads should both

have the following value:

4 + 2 * number-of-external-source-transfers

The /usr/vtr/config/vtrftpd.conf ﬁle should contain an additional record that

speciﬁes the FTP rate into and out of the clip cache path on the primary

SGI Media Server. This following is an example of such an entry:

/usr/vtr/clips 32000000

This entry indicates that a maximum FTP transfer value of 32 megabits/s is allocated for

clip mirroring.

Table 10-2 FTP Control Parameters

Control Parameter Meaning

vtr.ftp.io.rate.default Speciﬁes the default clip transfer rate (bits/s) for clip mirror

operations.

vtr.ftp.io.rate.enforce Speciﬁes whether the transfer rate may exceed the value

speciﬁed by the control vtr.ftp.io.rate.default.The

value 0 allows the bandwidth to exceed that default. The

value 1 enforces default transfer rate.

vtr.ftp.procs.max Speciﬁes the number of concurrent FTP transfers the

primary SGI Media Server supports.