Here is how you can calculate the number of web front end servers in a SharePoint farm.
Workload Characteristics
|
Value
|
Keyword
|
Total number of users
|
30000
| |
Total number of unique users per day
|
20000
|
N
|
Concurrency Rate
|
0.3
|
C
|
Requests per day per user
|
400
|
RPD
|
Peak usage ratio
|
3
| |
Hours in the business day
|
24
| |
Average peak RPS
|
83.33333333
| |
% Low-cost requests
|
0.25
| |
% Medium-cost requests
|
0.4
| |
% High-cost requests
|
0.35
| |
Weighted peak RPS
|
266.6666667
| |
Number of WFEs needed (@100 RPS/server)
|
2.666666667
|
Calculate RPS:
N: Total number of unique users ("20,000 of whom access the farm on any given day")
C: Concurrent user rate ("30 percent of the users will use the portal at the same time")
RPD: Requests per day per user ("Each user makes 400 requests in the course of a business day")
Peak usage ratio = 3 ("peak usage can be as much as three times")
Average RPS = (N * C * RPD * Peak Usage)/seconds
Calculate Weighted RPS based on type of usage
High-cost weight: 5
medium-cost weight: 3
low-cost weight: 1
% Low requests = 25% ("25 percent of requests involve tagging documents and similar activities")
% Medium requests = 40% ("40 percent of requests consist of operations such as accessing information in legacy systems")
% High requests = 35% ("everything else")
Calculate the weighted requests:
Weighted high RPS = (Average RPS* %high-cost requests * weight)
For example, high-cost requests have a weight of 5 = (83.3*0.35*5)
Weighted peak RPS = Weighted high RPS + Weighted medium RPS + Weighted low RPS
Calculate number of WFEs:
Number of WFEs is calculated using weighted peak RPS/100
Reference for this is MOC, technet. This is applicable for SharePoint 2010 and 2013.
How did you estimate or calculate the weight?
ReplyDeleteHigh-cost weight: 5
medium-cost weight: 3
low-cost weight: 1
For calculating
ReplyDeleteAverage RPS = (N * C * RPD * Peak Usage)/seconds
How you determine value of seconds?
It's the business day x 3600. 3600 is the seconds per hour.
Delete"Reference for this is MOC, technet. This is applicable for SharePoint 2010 and 2013."
ReplyDeleteCould you please provide the reference technet article link?
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