Command Line Reference Guide
Control and Monitoring | 85
Command
History
Related
Commands
epoch
e
Set the epoch scheduling time for the chassis.
Syntax
epoch {2.4 |3.2 | 10.4}
Parameters
Defaults
10.4
Command Modes
CONFIGURATION
Command
History
Usage
Information
You save the configuration and reload the chassis for the changes to the epoch command setting to take
affect.
When using 10 SFMs in an ExaScale chassis, the 10.4 and 2.4 settings are both line rate. Additionally,
the 2.4 setting has a lower latency. When using 9 SFMs in an ExaScale chassis, the 10.4 setting is line
rate; the 2.4 setting reduces throughput. Dell Force10 recommends using the 10.4 setting when the
system has 9 SFMs. Using 8 SFMs in an ExaScale chassis reduces throughput at any epoch setting.
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
E-Series original Command
exit Return to the lower command mode.
2.4 Enter the keyword 2.4 to set the epoch to 2.4 micro-seconds and lower the latency.
This option is available on the E600i and E1200i E-Series ExaScale systems only.
3.2 Enter the keyword 3.2 to set the epoch to 3.2 micro-seconds and lower the latency.
This option is available on the E600/E600i and E1200/E1200i only. ExaScale does not supports this
setting with FTOS 8.3.1.0 and later.
10.4 Enter the keyword 10.4 to set the epoch to 10.4 micro-seconds.
This is the default setting and is available on the E300, E600/E600i, and E1200.
Version 8.3.1.0 Added 2.4 micro-seconds option. ExaScale supports only 10.4 microseconds and 2.4
microseconds with FTOS 8.3.1.0 and later.
Version 8.1.1.2 Introduced on E-Series ExaScale E600i
Version 8.1.1.0 Introduced on E-Series ExaScale E1200i
Version 6.2.1.1 Support for E300 introduced (10.4 only)
Version 6.1.1.0 Values changed as described above
Note: The E300 supports only the 10.4 epoch setting. The E-Series TeraScale E600/E600i and the
E1200/E1200i systems support the 10.4 and the 3.2 epoch settings.
Note: For E-Series ExaScale, the 2.4 setting is supported on FTOS version 8.3.1.0 and later. The 10.4
setting is supported on all ExaScale FTOS versions. The 3.2 setting is only supported on FTOS versions
8.2.1.0 and earlier.