[isapros] FW: Sizing and capacity planning spreadsheet to estimate required array size for a desired throughput.

• From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
• To: <isapros@xxxxxxxxxxxxx>
• Date: Thu, 1 Jun 2006 11:05:12 -0700

 <<ISA_Array_Capacity_Planning.xls.txt>> Sometimes a jewel shines in the NG...  
 


-------------------------------------------------------
   Jim Harrison
   MCP(NT4, W2K), A+, Network+, PCG
   http://isaserver.org/Jim_Harrison/
   http://isatools.org
   Read the help / books / articles!
-------------------------------------------------------
 

"Jason Fossen [ISA MVP]" <--@xxxxxx> wrote in message 
news:<eWkBmmZhGHA.3916@xxxxxxxxxxxxxxxxxxxx>...
Hello Gang:

Attached is a BETA version of a spreadsheet to calculate how many Enterprise 
Edition nodes in an array would be required for a given peak throughput, broken 
down by traffic type and GHz speed of CPUs.  (Just remove the ".txt" 
extra extension.)

The spreadsheet is based on the scaling numbers provided in Microsoft's 
article, "Best Practices for Performance in ISA Server 2004" 
(http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/bestpractices.mspx),
but you can plug in your own throughput requirements.

What I hope is that some ISA admins/experts here will look at the spreadsheet, 
plug in the data from their live ISA array, and compare the recommendations 
from the spreadsheet against their actual array's performance.  Feedback 
doesn't have to detailed, even a quick "looks about right compared to our array 
and traffic" would be great!

Or if you have Performance Monitor log data from a high-end ISA box that is 
operating near its max capacity, along with info about the traffic going 
through it, I could use that to validate the spreadsheet too (about two hour's 
worth of data during busy hours, sampled once every two minutes, for all the 
Processor, Memory, Web Proxy, Firewall Packet Engine, PhysicalDisk and Network 
Interface counters please).

When it's all done, I would be happy to give you credit in the spreadsheet for 
your time (if you wish) and then I will post the spreadsheet on 
http://www.ISAscripts.org for anyone to download.  Send me e-mail if you want 
your feedback or PerfMon log data to be private: jason (at-symbol) isascripts 
dot org.

   Thank You!

       Jason Fossen
       ISA Server MVP





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֟fT5ScenarioTransparent Web ProxyForward Web 
ProxyStateful filteringSSL-to-HTTP: OWASSL-to-HTTP: WebSSL-to-HTTP: 
RPC over HTTPSSL-to-SSL: OWASSL-to-SSL: RPC over HTTPSSL-to-SSL: Web
SSL Tunneling#Web Filter Enabled: L2TP over IPsecWeb Filter Enabled: 
PPTP$Web Filter Disabled: L2TP over IPsecWeb Filter Disabled: 
PPTP=Megacycles per Megabit of Throughput (Decompressed, for VPNs)MSDE 
logging is used. #No Web authentication is performed.2HTTP Web filter is 
enabled with default settings. 5ISA Server is loaded with characteristic Web 
traffic.YISA Server hardware is tuned as described in Tuning Hardware for 
Maximum CPU Utilization VAll numbers for VPN megacycles are per 
deencapsulated and decompressed tunnel traffic.Dual Xeon CPUsSingle 
Pentium 4 CPU    NLB Nodes Additional NLB Overhead Factor =No 
NLBTraffic To HandleBroken Down
By PercentageJAdditional Load Factor For Given Number of Nodes (Assume 1.75 
Load Factor)Minimum GHz per CPU per Node =Minimum GHZ per CPU per Node 
=First:Second:Third:0Web Filter Enabled: Site-to-Site IPsec 
Tunneling%Web Filter Enabled: Site-to-Site PPTP1Web Filter Disabled: 
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Filter Disabled: Site-to-Site IPsec TunnelingStateful Filtering
Megacycles/Mb1Megacycles/Mb of througput assumes the following:3Go to the 
correct table below (see red highlights).Traffic To Handle,KNote that it 
assumes 100% CPU utilization, so round up and plan for growth!S
Fourth: Read 
the minimum GHz speed of each CPU in each node to handle that traffic.
Version = 1.00Enter the peak Mb/s of traffic to be supported =0Are you 
using single-P4 or dual-Xeon mainboards?bMaximum number of nodes is 8 in the 
tables because that is what Microsoft's whitepaper recommends.NOTESÿ:õ   
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how many ISA Server 2004/2006 Enterprise Edition nodes in an array would be 
required to handle a user-defined assortment of traffic types.

The scaling factors and other weighting data were drawn from Microsoft's 
whitepaper entitled, "Best Practices for Performance in ISA Server 2004", last 
seen at 
http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/bestpractices.mspx

As in the above whitepaper, only single-P4 and dual-Xeon hardware 
configurations are considered in the spreadsheet; dual-core CPUs are not (yet) 
accounted for, so it's probably best to interpolate the results for dual-core 
CPUs as being half-way between the single-P4 and dual-Xeon configurations in 
the spreadsheet (or less than half, if you want to be on the safe side).

To use this spreadsheet, go to tab #2 and follow the instructions in the boxes 
highlighted in green: 

1) Enter the peak bandwidth in megabits per second that must be handled by the 
array.

2) Choose between the single-P4 or dual-Xeon tables, as your hardware dictates.

3) Edit the yellow cells to indicate the percentage of your traffic that will 
be of the specified types; for example, your total expected throughput might be 
90Mb/s, of which 60% is for forward web proxying, 20% is for transparent 
forward proxying, 15% for outbound SSL tunneling, and 5% for inbound OWA with 
SSL-to-HTTP bridging.  Each of these traffic types has a different CPU 
utilization rate (measured in millions of CPU processor cycles per megabit of 
that type of traffic).

4) In the lightblue cells, read the minimum GHz speed of each CPU for the 
indicated number of nodes (in that column) that is required to handle that 
traffic breakdown.  These GHz speeds are for 100% CPU utilization, so you must 
round up at least to the next higher GHz speed when you actually purchase the 
hardware or, even better, add an additional node and get a higher GHz speed 
too.  It's better to be pessimistic, and don't forget to plan for future growth.




DISCLAIMER:
This spreadsheet is provided "AS IS" without warranties or guarantees of any 
kind.  USE AT YOUR OWN RISK.  This spreadsheet is not endorsed by Microsoft and 
may contain bugs or errors in data or formulas.  This spreadsheet is provided 
for informational purposes only.    
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