Data Domain: Replication Throttle Overview

Summary: This article describes the throttling mechanism with replication. (This article assumes that replication has already been configured and running.)

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Instructions

Replication Throttle

 

PURPOSE:

This article describes the throttling mechanism with replication. This article assumes that replication has already been configured and running.

 
APPLIES TO:
  • All Data Domain models
  • Software Releases
  • Replication
 

SOLUTION:

What is a throttle? 

A throttle is a mechanism that allows the administrator to control the flow of something. In replication, the throttle allows the administrator to control how much data the replication system tries to send over the network at any given time. By default, the network bandwidth throttle is unlimited, which means replication always sends data as fast as possible.

 

How to tell if a throttle is set:

Use the "replication throttle show" command, as in the following example:

replication throttle show
Throttle: Default
No scheduled throttle times.
Actual throttle value: unlimited bps  

-- Or --

Throttle: Default
 Time       Sun       Mon       Tue       Wed       Thu       Fri       Sat
 ----       ---       ---       ---       ---       ---       ---       ---
06:00         -    20000K         -         -    20000K         -         -
 ----       ---       ---       ---       ---       ---       ---       ---
All units in bps (bits per second).
Active schedule: Thu, 06:00 at 20000K bps.
Actual throttle value: 20000K bps
 

How to set a throttle:

The administrator can set up a specific throttle schedule or can set a throttle value which is always effective with the "replication throttle" command.

Replication runs at the specified rate until the next scheduled change or until new replication throttle commands force a change.

Note: The system enforces a minimum rate of 98,304 bits per second, or 12 kilobytes.
 
 

To add a throttle, use the "replication throttle add" command:

replication throttle add <sched-spec> <bits>
Where:
      • <sched-spec> must specify:
        • One or more three-letter days of the week - valid values are mon, tue, wed, thu, fri, sat, sun, or the word "daily" to set the schedule every day of the week.
        • A time of day in 24-hour military time
      • <bits> must specify one of the following: 
        • <none> 
        • bps => raw bits per second
        • Kbps, kbps => 1000 bits per second
        • Mbps, mbps => 1000 * 1000 bits per second
        • Gbps, gbps => 1000 * 1000 * 1000 bits per second
        • Disabled
        • Unlimited
 

For example, the following command limits replication to 20 mbps starting on Mondays and Thursdays at 6:00 am:

replication throttle add mon thu 0600 20MBps
..."Mbps" units specified; 20 * 1000000 = 20000000 bps (20000 Kbps).
> Adding new schedule for Mon at 06:00 for 20000K bps
> Adding new schedule for Thu at 06:00 for 20000K bps
replication throttle show
Throttle: Default
 Time       Sun       Mon       Tue       Wed       Thu       Fri       Sat
 ----       ---       ---       ---       ---       ---       ---       ---
06:00         -    20000K         -         -    20000K         -         -
 ----       ---       ---       ---       ---       ---       ---       ---
All units in bps (bits per second).
Active schedule: Thu, 06:00 at 20000K bps.
Actual throttle value: 20000K bps
 

How to delete a throttle:

To delete a throttle, the use the "replication throttle del" command:

replication throttle del <sched-spec>
Where:
      • <sched-spec> must specify:
        • One or more three-letter days of the week - valid values are mon, tue, wed, thu, fri, sat, sun, or the word "daily" to set the schedule every day of the week.
        • A time of day in 24-hour military time
 

For example, to delete the Monday 6am throttle:

replication throttle del mon 0600
> Deleting schedule for Mon at 06:00 (was 20000K bps)
Summary: 1 schedule deleted.
replication throttle show
Throttle: Default
 Time       Sun       Mon       Tue       Wed       Thu       Fri       Sat
 ----       ---       ---       ---       ---       ---       ---       ---
06:00         -         -         -         -    20000K         -         -
 ----       ---       ---       ---       ---       ---       ---       ---
All units in bps (bits per second).
Active schedule: Thu, 06:00 at 20000K bps.
Actual throttle value: 20000K bps
 
 
REFERENCE:

Additional Information

 

    Affected Products

    Data Domain

    Products

    Data Domain
    Article Properties
    Article Number: 000014981
    Article Type: How To
    Last Modified: 30 May 2025
    Version:  17
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