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v-abtan edited this page Oct 26, 2020 · 11 revisions

Assumptions

The estimate below assumes:

  • 1000 users in the tenant
  • 1 message sent to all users each week (~5/month)
  • Administrator opts to create a custom domain name and obtain an SSL certificate for the site.
    • When purchased through Azure, this is typically ~$12 for a domain name, and $75/year for the SSL certificate.
    • If you choose to use Azure Front Door, that adds a monthly cost of $46 (for 2 routing rules + minimal bandwidth consumption).

The template defaults to using Azure Front Door, to reduce the cost of trying out and experimenting with the template, rather than requiring you to get a custom domain outright. For instance, you can run your instance for a few days, then turn off the services, and only pay for your actual Azure usage when the services were on.

We ignore:

  • Operations associated with app installations, as that happens only once per user/team
  • Operations associated with the authors viewing the tab, given the assumption that they are sending only 5 messages/month.
  • Executions associated with Prep or Send function, as the execution count is trivial to the calculations.

SKU recommendations

The recommended SKUs for a production environment are:

  • App Service: Standard (S1)
  • Service Bus: Basic

Estimated load

Number of messages sent: 1000 users * 5 messages/month = 5000 messages

Data storage: 1 GB max

  • Messages are on the order of KBs

Table data operations:

  • Prep function

    • (3 read * 5000 messages) = 15000 reads

  • Send function

    • (4 read * 5000 messages) = 20000 reads
    • (1 write * 5000 messages) = 5000 writes

  • Data function

    • Aggregating status: (1 read * 5000 messages) = 5000 reads

Service bus operations:

  • ((1 write + 1 read) operations/sent message * 5000 messages) = 10000 operations

Azure Function:

For Gb-sec pricing calculation, please refer this formula. (Memory Size * Execution Time * Execution Count)/1024000. Min. memory size = 128 Mb. Min. execution time = 100 ms.

  • Send function
    • (1 invocation * 5000 messages) = 5000 invocations
    • (128 Mb * 3000 * 5000 messages)/1024000 = 1875 Gb-sec

Estimated cost

IMPORTANT: This is only an estimate, based on the assumptions above. Your actual costs may vary.

Prices were taken from the Azure Pricing Overview on 19 October 2020, for the West US 2 region.

Use the Azure Pricing Calculator to model different service tiers and usage patterns.

Resource Tier Load Monthly price
Storage account (Table) Standard_LRS < 1GB data, 45000 operations $0.045 + $0.01 = $0.05
Bot Channels Registration F0 N/A Free
App Service Plan S1 744 hours $74.40
App Service (Bot + Tab) - (charged to App Service Plan)
Azure Function Dedicated 10000 executions (free up to 1 million executions)
Service Bus Basic 10000 operations $0.05
Application Insights - < 5GB data (free up to 5 GB)
Total $74.50

Estimated load - 1M messages

Data storage: 3 GB max

  • Messages are on the order of KBs

Number of messages sent: 1M messages

Table data operations:

  • Prep function

    • (3 read/prep * 1M messages) = 3M reads

  • Send function

    • (4 read * 1M messages) = 4M reads
    • (1 write * 1M messages) = 1M writes

  • Data function

    • Aggregating status: (1 read * 1M messages) = 1M reads

Service bus operations:

  • ((1 write + 1 read) operations/sent message * 1M messages) = 2M operations

Azure Function:

For Gb-sec pricing calculation, please refer this formula. (Memory Size * Execution Time * Execution Count)/1024000. Min. memory size = 128 Mb. Min. execution time = 100 ms.

  • Send function
    • (1 invocation * 1M messages) = 1M invocations
    • (128 Mb * 3000 * 1M messages)/1024000 = 375000 Gb-sec

Estimated cost - 1M messages

IMPORTANT: This is only an estimate, based on the assumptions above. Your actual costs may vary.

Prices were taken from the Azure Pricing Overview on 19 October 2020, for the West US 2 region.

Use the Azure Pricing Calculator to model different service tiers and usage patterns.

Resource Tier Load Monthly price
Storage account (Table) Standard_LRS < 3GB data, 9M operations $0.14 + $0.32 = $0.46
Bot Channels Registration F0 N/A Free
App Service Plan S1 744 hours $74.40
App Service (Bot + Tab) - (charged to App Service Plan)
Azure Function Dedicated 1M executions (free up to 1 million executions)
Service Bus Basic 2M operations $0.10
Application Insights - < 5GB data (free up to 5 GB)
Total $74.96

Estimated load - 2M messages

Number of messages sent: 2M messages

Data storage: 6 GB max

  • Messages are on the order of KBs

Table data operations:

  • Prep function

    • (3 read * 2M messages) = 6M reads

  • Send function

    • (4 read * 2M messages) = 8M reads
    • (1 write * 2M messages) = 2M writes

  • Data function

    • Aggregating status: (1 read * 2M messages) = 2M reads

Service bus operations:

  • ((1 write + 1 read) operations/sent message * 2M messages) = 4M operations

Azure Function:

For Gb-sec pricing calculation, please refer this formula. (Memory Size * Execution Time * Execution Count)/1024000. Min. memory size = 128 Mb. Min. execution time = 100 ms.

  • Send function
    • (1 invocation * 2M messages) = 2M invocations
    • ( 128 Mb * 3000 * 2M messages)/1024000 = 750000 Gb-sec

Estimated cost - 2M messages

IMPORTANT: This is only an estimate, based on the assumptions above. Your actual costs may vary.

Prices were taken from the Azure Pricing Overview on 19 October 2020, for the West US 2 region.

Use the Azure Pricing Calculator to model different service tiers and usage patterns.

Resource Tier Load Monthly price
Storage account (Table) Standard_LRS < 6GB data, 18M operations $0.27 + $0.65 = $0.92
Bot Channels Registration F0 N/A Free
App Service Plan S1 744 hours $74.40
App Service (Bot + Tab) - (charged to App Service Plan)
Azure Function Dedicated 2M executions $5.80
Service Bus Basic 2M operations $0.20
Application Insights - < 5GB data (free up to 5 GB)
Total $81.32
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