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Ghost peer to peer multicast speeds are slower than expected

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Article ID: 163233

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Updated On:

Products

Deployment Solution Ghost Solution Suite

Issue/Introduction

After upgrading from DS 6.9 SP6, 7.0 or 7.1 to GSS 3.0, 3.1, 7.x, or 8.x you notice your peer to peer multicasting speeds drop significantly.  Some times as much as half.  In many situations it will drop to around 300MB/Min or lower from previous speeds of over 1000MB/Min.

Cause

There was a change made to how Ghost manages its connected clients during a peer to peer multicast session.  This change was added to create better stability between the client machines within the session.  Prior to this change customers were seeing issues with machines simply dropping from the peer to peer multicast session for what appeared to be no reason.

Resolution

Development is aware of this slow down and their recommendation is to switch to using Ghostcast Server to speed things up if using DS 6.9/GSS 3.1.  If you are unable to switch to a Ghostcast server do the following for 6.9/GSS:

  1. Open up the 'Deploy Image' task
  2. On the 'additional command line' argument add '-speed=15'
  3. This setting limits Ghost to run up to 15 MB/sec

.DS 7.x/8.x users do ONE of the following:

Global Setting

  1. Open the NS console
  2. Click on 'settings > deployment > image multicasting'
  3. Change the 'speed limit' value from '0' to '900'  (15 * 60 to get the value to MB/min instead of MB/sec)
  4. Save changes
  5. Deploy image

Note:  Behind the scenes 900 is divided by 60 so that the 'speed=15' is added to the ghost command line.  The reason that the UI states MB/Min is because when Rdeploy was the default imaging engine, it used MB/min for its speed setting.

Deploy Image task basis

  1. Double Click on 'deploy image' task
  2. Click on 'Advanced' button
  3. Click on 'Multicasting' tab
  4. Check the box next to 'to override the.......'
  5. Change the 'speed limit' value to '900'
  6. Click 'OK'
  7. Deploy the image

NOTE: DO NOT add 'speed=15' to the 'command-line options' under the 'command line' tab.