Forum Discussion

Azim_IIPL's avatar
Azim_IIPL
Icon for Altocumulus rankAltocumulus
Nov 15, 2023

F5 BIG-IP Sizing Requirement

Hi Expert There is ongoing  requirement for putting all internet facing applications behind web application firewall, and WAF TPS consume F5 CPU and memory and other parameters as well. Fear is that...
application delivery
F5 boxes sizing
ssl
throughput
tps
  • zamroni777's avatar
    zamroni777
    Nov 17, 2023

    for raw estimation:
    (your_targeted_tps at 5th year / 80% ) x 4  = required F5 datasheet tps

    5th year: because usually company's asset depreciation is calculated for 5 years.
    80% ==> so you have 20% buffer
    x 4 ==> because usually f5 datasheet spec is cut by 75% for heavy processing (WAF, complex irules, etc.)

zamroni777's avatar
zamroni777
Icon for Nacreous rankNacreous
Nov 17, 2023

for raw estimation:
(your_targeted_tps at 5th year / 80% ) x 4  = required F5 datasheet tps

5th year: because usually company's asset depreciation is calculated for 5 years.
80% ==> so you have 20% buffer
x 4 ==> because usually f5 datasheet spec is cut by 75% for heavy processing (WAF, complex irules, etc.)

  • Azim_IIPL's avatar
    Azim_IIPL
    Icon for Altocumulus rankAltocumulus
    Nov 17, 2023

    @zamroni i am not sure fully throughup  could you please a few comments again in simple way. 

    Thank you 

     

    The following is brief your comments

    1. Your Targeted TPS at 5th Year: This is the level of transactions per second (TPS) you aim to achieve after five years of operation.

    2. /80%/80%: We include an 80% factor to provide a buffer or safety margin. This accounts for any unforeseen challenges or fluctuations, ensuring a more reliable estimate.

    3. ×4×4: To accommodate heavy processing tasks like Web Application Firewall (WAF), complex iRules, and other demanding operations, we multiply by 4. This factor assumes that the F5 datasheet specifications are typically reduced by 75% to ensure realistic performance under heavy workloads.

    In simpler terms, the formula helps estimate the required Transaction Per Second (TPS) capacity of an F5 device by considering your projected TPS at the 5th year, providing a safety buffer of 20%, and adjusting for the heavy processing demands by multiplying by 4. This ensures that the F5 device can handle the expected workload even under challenging conditions and future growth.

    • zamroni777's avatar
      zamroni777
      Icon for Nacreous rankNacreous
      Nov 17, 2023

      from you reply, i guess you understood my raw formula.
      surely, the TPS is maximum TPS.
      adjust the asset depreciation year duration and fluctuation buffer accordingly.

      • Azim_IIPL's avatar
        Azim_IIPL
        Icon for Altocumulus rankAltocumulus
        Nov 17, 2023

        Thank you for your help!