Installation and Configuration Guide for Linux® Workstations
Installation and Configuration Guide for Linux® Workstations
Installation and Configuration Guide for Linux® Workstations
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Each partition managed by the B<strong>and</strong>width Manager must have a [Device] section associated to it in the<br />
/usr/discreet/sw/cfg/sw_bwmgr.cfg file.<br />
To add a new device to the B<strong>and</strong>width Manager:<br />
1 Open the /usr/discreet/sw/cfg/sw_bwmgr.cfg file in a text editor.<br />
2 Add a new [Device] section at the end of the file, using the following syntax:<br />
TIP You may also copy <strong>and</strong> paste an existing [Device] section, <strong>and</strong> change its parameters.<br />
[Device]<br />
Path=<br />
TotalAvailableReadB<strong>and</strong>width=<br />
TotalAvailableWriteB<strong>and</strong>width=<br />
DefaultReservation=<br />
where:<br />
■ represents the number of the [Device] section, starting at 0. For example:<br />
[Device0]<br />
■ Path specifies the partition's mount point. Since a partition can have several paths, <br />
represents the number of the current path, starting at 0 <strong>for</strong> each device. For example:<br />
Path0=/mnt/XYZ<br />
Path1=/usr/local/ABC<br />
■ TotalAvailableReadB<strong>and</strong>width represents the estimated total reading b<strong>and</strong>width of the device, in<br />
megabytes per second. Based on this value, <strong>and</strong> on the amount of active reservations <strong>for</strong> the current<br />
partition, the B<strong>and</strong>width Manager decides whether new reservation requests are granted or rejected.<br />
For example:<br />
TotalAvailableReadB<strong>and</strong>width=200<br />
■ TotalAvailableWriteB<strong>and</strong>width represents the maximum estimated writing b<strong>and</strong>width of the<br />
device, in megabytes per second. If this parameter is not specified, its value defaults to the value of<br />
TotalAvailableReadB<strong>and</strong>width. For example:<br />
TotalAvailableWriteB<strong>and</strong>width=150<br />
NOTE The total b<strong>and</strong>width parameters are estimates of the theoretical maximum b<strong>and</strong>width of the<br />
partition. The actual b<strong>and</strong>width is affected by several factors, including multiple applications trying to<br />
concurrently read or write to it. The B<strong>and</strong>width Manager continuously measures partition per<strong>for</strong>mance<br />
<strong>and</strong> dynamically maintains the actual total available b<strong>and</strong>width <strong>for</strong> each partition.<br />
■ DefaultReservation sets the b<strong>and</strong>width assigned by default to applications that are denied a<br />
reservation request or that don't have individual or group reservations associated to them. The<br />
value is expressed in megabytes per second. For example:<br />
DefaultReservation=10<br />
3 After setting up all the partition parameters described above, you can start defining reservations <strong>for</strong><br />
the current partition.<br />
4 Save <strong>and</strong> close the configuration file, <strong>and</strong> restart Stone <strong>and</strong> Wire by typing:<br />
/etc/init.d/stone+wire restart<br />
Advanced <strong>Configuration</strong> <strong>and</strong> Troubleshooting | 61