Avocent Cyclades ACS 5000 - Ramdisk; Linear Vs. Circular Buffering

88 Cyclades ACS 5000 Advanced Console Server Command Reference Guide
the parameter s1.data_buffering, though the value cannot be zero since a zero value turns off
data buffering.
The conf.nfs_data_buffering parameter format is,
<server name or IP address>:<remote pathname>
For example, if data buffering is enabled for port 1, the data is stored in the file ttyS1.data in local
directory /var/run/DB or in remote server indicated by conf.nfs_data_buffering.
Ramdisk
Data buffering files are created in the directory /var/run/DB. If the parameter s<nn>.alias is
configured for the port <nn>, this name is used. For example, if the alias is called fremont_server,
the data buffering file is named fremont_server.data.
Linear vs. Circular buffering
For local data buffering, this parameter allows users to buffer data in either a circular or linear
fashion. Circular format (cir) is a revolving buffer file that is overwritten whenever the limit of the
buffer size (set by all.data_buffering) is reached. In linear format (lin), data transmission between
the remote device and the serial port ceases once the 4k bytes Rx buffer in the kernel is reached.
Then if a session is established to the serial port, the data in the buffer is shown
(all.dont_show_DBmenu or sxx.dont_show_DBmenu must be 2), cleared and data transmission is
resumed. Linear buffering is impossible if flow control is set to none. Default is cir.
To configure data buffering:
1. Execute the following command to configure data buffering. Refer to Table 5.12 for the
configuration parameters.
cli> config physicalports all databuffering [parameter] <value>
2. Activate and save your configuration.
Table 5.12: Data Buffering Configuration Parameters
Parameter Value Description
bufferonlynosession no|yes Buffer only when connected to the serial port.
buffersyslogonlynose
ssion
no|yes Only syslog is buffered.
desttype local | remote Define the data buffering location.
filesize <file size in bytes> Defines the maximum size of the data buffer file. This
parameter must be greater than zero otherwise all
parameters relating to data buffering are disregarded.
mode cir | lin Choose between circular or linear data buffering.
nfspath <pathname> Define the NFS path.