User`s guide

130 007-4403-003

10: Clip Mirror Configuration

Redesignating Servers

To redesignate a mirror platform as the primary SGI Media Server, follow these steps:

1. Disable clip mirroring on the mirror platform, as shown in the following command:

SSET clipmirror vtr.clipmirror.primary_server.hostname ""

2. On a new primary SGI Media Server server, verify that the

/usr/vtr/config/system-defaults/clipmirror ﬁle has the following

control unset, as shown in the following entry:

vtr.clipmirror.primary_server.hostname ""

Unset the control if necessary.

3. On the mirror platform, set the value of the control parameter

vtr.clipmirror.primary_server.hostname to the name of the new primary

SGI Media Server.

Bandwidth Management

Each SGI Media Server must have an XFS ﬁlesystem organized to support real-time I/O

operations. This persistent storage structure must be managed by a guaranteed rate I/O

(GRIO) daemon to enable predictable SGI Media Server execution. Each

SGI Media Server system is parameterized by the maximum number of full-rate video

streams that it supports. This constraint is based on the clip video format and the number

of video codecs installed and used concurrently.

Bandwidth is consumed by the SGI Media Server for each transfer to and from an XFS

real-time ﬁlesystem. Hence, bandwidth management for clip mirror operations

comprises one aspect of SGI Media Server resource allocation. This bandwidth

management is accomplished by limiting the total number of simultaneous transfers and

the transfer rate.

The clip mirror controls and FTP controls parameterize this aspect of SGI Media Server

resource allocation. The total number of simultaneous clip mirror operations is speciﬁed

with vtr.clipmirror.max_threads.

The bandwidth consumed by FTP operations is speciﬁed by the controls contained in the

/usr/vtr/config/vtrftpd.conf ﬁle. Table 10-2 describes these controls. The

values for these controls must be speciﬁed in megabits per second.