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Windows NLB vs ISA server farm for CAS publishing

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Windows NLB vs ISA server farm for CAS publishing - 20.Feb.2009 5:28:02 AM   
vuvur

 

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Hi everybody,

what is the best way to publish network-balanced CAS servers: to implement a server farm on ISA side or to enable NLB for CAS servers and to publish a load balancer?

I haven't found approptiate information yet...what are general recomendations?

And the particular case: if ActiveSync, Webmail and RPC-HTTPS should be published to Internet and OWA and IMAP should be reachable internally - what is the best way to go?

many thanks and best regards... 
Post #: 1
RE: Windows NLB vs ISA server farm for CAS publishing - 20.Feb.2009 11:20:37 AM   
tshinder

 

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Server Farm publishing is the best way to go for publishing the Web services. For non-Web services such as IMAP, NLB is the best option.

Use the DIPs for the farm publishing and the VIPs for the non-Web farm publishing.

HTH,
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to vuvur)
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RE: Windows NLB vs ISA server farm for CAS publishing - 24.Feb.2009 7:26:17 AM   
vuvur

 

Posts: 31
Joined: 3.Feb.2006
From: Germany
Status: offline
Many thankz Tom. And what are the arguements for ISA web farm? Is it more reliable or is it just simplier to create it than NLB cluster? If it is not the simplicity, WHY is it better?

(in reply to tshinder)
Post #: 3
RE: Windows NLB vs ISA server farm for CAS publishing - 24.Feb.2009 9:23:58 AM   
Jason Jones

 

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Server farm load balancing (SFLB) is service aware, whereas NLB is not. It also support cookie (session) affinity, whereas NLB only support source IP affinity.

Hence if IIS fails to respond to GET requests, ISA SFLB will stop publishing but NLB would happily keep sending requests...

More info here: http://technet.microsoft.com/en-us/library/bb794841.aspx

Cheers

JJ

< Message edited by Jason Jones -- 24.Feb.2009 9:26:01 AM >


_____________________________

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

(in reply to vuvur)
Post #: 4
RE: Windows NLB vs ISA server farm for CAS publishing - 25.Feb.2009 4:24:04 AM   
vuvur

 

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From: Germany
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Many thanks Jason, I've gotten it..

(in reply to Jason Jones)
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RE: Windows NLB vs ISA server farm for CAS publishing - 25.Feb.2009 4:50:37 AM   
Jason Jones

 

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Cool!

It's a great ISA feature

_____________________________

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

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Post #: 6
RE: Windows NLB vs ISA server farm for CAS publishing - 27.Feb.2009 12:11:50 PM   
tshinder

 

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From: Texas
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Hi Jason,

I thought it was Web Farm Load Balancing (WFLB)

Tom

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Thomas W Shinder, M.D.

(in reply to Jason Jones)
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RE: Windows NLB vs ISA server farm for CAS publishing - 27.Feb.2009 8:05:49 PM   
Jason Jones

 

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We all know it's web only, but they still chose to called it 'Server Farm' in the GUI

_____________________________

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

(in reply to tshinder)
Post #: 8
RE: Windows NLB vs ISA server farm for CAS publishing - 5.Mar.2009 1:16:21 PM   
tshinder

 

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Ha! Good point. In other docs they refer to it as Web Farm Load Balancing.

Thanks!
Tom

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Thomas W Shinder, M.D.

(in reply to Jason Jones)
Post #: 9
RE: Windows NLB vs ISA server farm for CAS publishing - 11.Mar.2009 9:17:16 PM   
Jason Jones

 

Posts: 4663
Joined: 30.Jul.2002
From: United Kingdom
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They should fix the GUI or use SFLB in the docs then

Inconsistency breeds confusion

_____________________________

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

(in reply to tshinder)
Post #: 10
RE: Windows NLB vs ISA server farm for CAS publishing - 16.Mar.2009 10:01:34 AM   
tshinder

 

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No doubt about it! We're in complete agreement here

Thanks!
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to Jason Jones)
Post #: 11

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