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Adding server to array

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Adding server to array - 25.Nov.2010 10:08:19 AM   
beefy80

 

Posts: 5
Joined: 9.Feb.2008
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Hi, I am rebuilding a server due to hardware failure I have dealt with the CSS as this server was the primary CSS. I was helped with this in a previous thread but now I need to install ISA into the array. My problem is the ISA server array is used 24/7. I also use NLB (integrated / unicast mode) on this server along with CARP. What I want to know is if I add the server to the array if it will take the other server down while it configures the array and NLB. This server both publishes sites and also is used for our internet access. Also if anyone has some experience on getting this live I would really appreciate the knowledge.
Post #: 1
RE: Adding server to array - 25.Nov.2010 11:20:03 AM   
Jason Jones

 

Posts: 4663
Joined: 30.Jul.2002
From: United Kingdom
Status: offline
Adding a new server into the array will cause NLB to converge and this will briefly impact connections.

This is for ISA Server 2006, but I imagine it is still valid for TMG:

Configuring NLB When Joining a Server to an Array

When you set up ISA Server, joining the server to an existing array, ISA Server enables NLB integration for this new array member if NLB is enabled for the entire array. However, you may not want the NLB service to start automatically when installation completes for the following reasons:
  • Existing connections may be stopped when a new array member joins the NLB cluster. For this reason, you might want to schedule starting NLB on the new array member only when there is relatively little network activity.

  • You might want to review the new array member configuration before joining it to the NLB cluster. Thereafter, you can start NLB on that array member.

To ensure that ISA Server does not automatically start NLB on the new array member, create a batch file with a single command nlb suspend executed in a loop. Execute this batch file repeatedly as you install the new array member.

Source: http://technet.microsoft.com/en-us/library/bb794741.aspx

Cheers

JJ


_____________________________

Jason Jones | Forefront MVP | Silversands Ltd
My Blogs: http://blog.msedge.org.uk/ and http://blog.msfirewall.org.uk/

(in reply to beefy80)
Post #: 2

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