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Hardware Recommendations Access Nodes Exchange Online

The access node is the server that runs backup jobs for the User Mailbox.

Important

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

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*

5000

10,000

Number of messages per day**

500,000

1 million

Online Service account

5

10

On-Premises Service Account

2 (1 per Exchange Server)

4(1 per Exchange Server)

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

Online Service account

5

10

On-Premises Service Account

2 (1 per Exchange Server)

4(1 per Exchange Server)

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: 6/13/2019 2:22:20 AM