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Hardware Recommendations for Exchange Online Access Nodes

Verify that Exchange Online access nodes (the physical or virtual machines that run backup jobs for the User Mailbox) meet the hardware recommendations.

Important:

  • For high-availability, configure at least two access nodes.
  • Use an access node for every 10,000 mailboxes in your environment.
  • For the first full backup, use extra access nodes and service accounts.

Access Node Size Without Content Indexing

If you do not use content indexing, base the size of your access nodes on these guidelines.

Number of mailboxes*

5,000

10,000

Number of messages per day**

500,000

1 million

Azure Apps

5

10

CPU or vCPU, and RAM

  • CPU or vCPU: 4 cores
  • RAM: 8 GB
  • CPU or vCPU: 8 cores
  • RAM: 16 GB

Streams per access node

10

20

* Based on an average mailbox size of 5 GB, and an average of 50,000 messages per mailbox.

** Based on an average message size of 100 KB.

Access Node Size with Content Indexing

If you use content indexing, base the size of your access nodes on these guidelines.

Number of mailboxes*

5000

10,000

Number of messages per day**

500,000

1 million

Azure Apps

5

10

CPU or vCPU, and RAM

  • CPU or vCPU: 8 cores
  • RAM: 16 GB
  • CPU or vCPU: 16 cores
  • RAM: 32 GB

Streams per access node

10

20

* Based on an average mailbox size of 5 GB, and an average of 50,000 messages per mailbox.

** Based on an average message size of 100 KB.

Last modified: 2/11/2021 7:38:15 PM