Setup guide

not jeopardized by requests from concurrent processes, including access from remote hosts such as Flare
workstations.
NOTE Bandwidth reservation policies apply only to I/O requests from Creative Finishing applications and tools.
They cannot protect your storage bandwidth from I/O requests coming from third-party processes or user
interactions. It is your responsibility to avoid using third-party tools with the frame storage. See Limit concurrent
usage (page 45).
Bandwidth requests are managed by the Stone and Wire Bandwidth Manager, based on the parameters in
the /usr/discreet/sw/cfg/sw_bwmgr.cfg configuration file.
When Stone and Wire starts up, the Bandwidth Manager automatically creates a [Device] section in the
configuration file for each partition declared in /usr/discreet/sw/cfg/stone+wire.cfg. The Manager sets
total theoretical read and write bandwidth values for each device, as well as the default reservation values.
Adding a New Device to the Bandwidth Manager
Use the instructions in this section if you want additional standard filesystem mount points (such as mount
points to SAN volumes or to any other standard filesystem volume that is not present in the
/usr/discreet/sw/cfg/stone+wire.cfg file) to be managed by the Bandwidth Manager. You may also use
these instructions as guidelines for understanding and editing the settings in the predefined [Device] sections
of the configuration file.
Each partition managed by the Bandwidth Manager must have a [Device] section associated to it in the
/usr/discreet/sw/cfg/sw_bwmgr.cfg file.
To add a new device to the Bandwidth Manager:
1 Open the /usr/discreet/sw/cfg/sw_bwmgr.cfg file in a text editor.
2 Add a new [Device] section at the end of the file, using the following syntax:
TIP You may also copy and paste an existing [Device] section, and change its parameters.
[Device<device_number>]
Path<path_number>=<device_mount_point>
TotalAvailableReadBandwidth=<total_read_bandwidth>
TotalAvailableWriteBandwidth=<total_write_bandwidth>
DefaultReservation=<default_reservation>
where:
■ <device_number> represents the number of the [Device] section, starting at 0. For example:
[Device0]
■ Path specifies the partition's mount point. Since a partition can have several paths, <path_number>
represents the number of the current path, starting at 0 for each device. For example:
Path0=/mnt/XYZ
Path1=/usr/local/ABC
■ TotalAvailableReadBandwidth represents the estimated total reading bandwidth of the device, in
megabytes per second. Based on this value, and on the amount of active reservations for the current
partition, the Bandwidth Manager decides whether new reservation requests are granted or rejected.
For example:
TotalAvailableReadBandwidth=200
■ TotalAvailableWriteBandwidth represents the maximum estimated writing bandwidth of the
device, in megabytes per second. If this parameter is not specified, its value defaults to the value of
TotalAvailableReadBandwidth. For example:
46 | Chapter 1 Flame Premium Installation and Configuration