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Nbuddm's avatar
Nbuddm
Level 3
13 years ago
Solved

Replication throttling between data domains

Hi All

we have two DDs where we do netbackup managed WAN replication.

we are having issues due to the excessive bandwith usage by replication.

Any suggestions to throttle the bandwith for data transfers between DD's.

 

 

Backing Up
Backup and Recovery
NetBackup
Performance
UNIX
  • RonCaplinger's avatar
    RonCaplinger
    13 years ago

    The Data Domains have replication throttling built in, and you can schedule when you might want those values to change.  This is effective even when NetBackup is managing the replications using OST, as NBU is just monitoring the replication handled by the DD's.

     

    xxxxxxx@yyyyyyy# replication throttle show
 Time       Sun       Mon       Tue       Wed       Thu       Fri       Sat
 ----       ---       ---       ---       ---       ---       ---       ---
00:00 536870912 536870912 536870912 536870912 536870912 536870912 536870912

 ----       ---       ---       ---       ---       ---       ---       ---
All units in bps (bits per second).
Active schedule: Tue, 00:00 at 536870912 bps.
Actual throttle value (from kernel): 536871000 bps

5 Replies

  • RonCaplinger's avatar
    RonCaplinger
    Level 6
    13 years ago

    The Data Domains have replication throttling built in, and you can schedule when you might want those values to change.  This is effective even when NetBackup is managing the replications using OST, as NBU is just monitoring the replication handled by the DD's.

     

    xxxxxxx@yyyyyyy# replication throttle show
 Time       Sun       Mon       Tue       Wed       Thu       Fri       Sat
 ----       ---       ---       ---       ---       ---       ---       ---
00:00 536870912 536870912 536870912 536870912 536870912 536870912 536870912

 ----       ---       ---       ---       ---       ---       ---       ---
All units in bps (bits per second).
Active schedule: Tue, 00:00 at 536870912 bps.
Actual throttle value (from kernel): 536871000 bps
  • Nicolai's avatar
    Nicolai
    Moderator
    13 years ago

    This will be a hard nut to crack. I found this text in the NBU SLP bets practice:

    http://www.symantec.com/docs/HOWTO73205

    Bandwidth considerations
    The network bandwidth required for Auto Image Replication is unpredictable to NetBackup, based on the fact that we have no way to predict in real-time the deduplication rate of a duplication image set, the Optimized Duplication throughput of the storage device, or current network traffic. Additionally, this is very likely to occur over a WAN which implies longer latencies and lower bandwidth in general. This is another reason that it is wise to plan accordingly and to ramp up slowly.
     
    You can however try to limit the number of SLP than can run concurrent by enabling/disabling SLP during the day
     
    nbstlutil inactive -lifecycle <lifecycle name>
    nbstlutil active -lifecycle <lifecycle name>
     
    http://www.symantec.com/docs/TECH170086
     
    But even that may not be enough to limit the bandwith usage to an acceptable level.
  • Nbuddm's avatar
    Nbuddm
    Level 3
    13 years ago

    Thanks Nicolai & Ron for the response.

    Yes I adjusted the Replication throttling settings on the DD.the n/w traffic looks good now.

  • teiva-boy's avatar
    teiva-boy
    Level 6
    13 years ago

    Right depending on what version of the DDOS you are using, you can change this in the Managment web interface.  Cap the entire amount of bandwidth, or put a schedule to the cap.

  • Nicolai's avatar
    Nicolai
    Moderator
    13 years ago

    Cool - I knew this option existed but did not know it worked with SLP also.