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Hardware Recommendations Index Server

Verify that Exchange Online Index Server meets the hardware recommendations. The Index Server stores metadata, performs content indexing (if content indexing is configured), and provides browsing and searching of archived messages.

Index Server Size Without Content Indexing

Use these guidelines to select the appropriate hardware for your Index Server if you do not use content indexing. In this case, archiving and cleanup operations are considered.

 

Large

Medium

Small

Objects per node (estimated)*

500 million

200 million

50 million

Number of mailboxes**

10,000

4000

1000

CPU, vCPU, and RAM

  • CPU or vCPU: 16 cores
  • RAM: 32 GB
  • CPU or vCPU: 8 cores
  • RAM: 16 GB
  • CPU or vCPU: 4 cores
  • RAM: 8 GB

Source application size

50 TB

20 TB

5 TB

Index disk space

3 TB

1.5 TB

500 GB

Index disk IOPS

  • Minimum: 800 IOPS
  • Recommended: 1600 IOPS
  • Minimum: 600 IOPS
  • Recommended: 800 IOPS
  • Minimum: 400 IOPS
  • Recommended: 600 IOPS

    * Based on an average message size of 100 KB.

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

Index Server Sizing with Content Indexing

Use these guidelines to select the appropriate hardware for your Index Server if you use content indexing. In this case, archiving, cleanup, and content indexing operations are considered. The entire message is content indexed.

 

Large

Medium

Small

Objects per node (estimated)*

250 million

150 million

50 million

Number of mailboxes**

5000

2000

400

CPU, vCPU and RAM

  • CPU or vCPU: 16 cores
  • RAM: 64 GB
  • CPU or vCPU: 16 cores
  • RAM: 32 GB
  • CPU or vCPU: 8 cores
  • RAM: 16 GB

Source application size

25 TB

15 TB

5 TB

Index disk space

10 TB

6 TB

2 TB

Index disk IOPS

Minimum: 2400 IOPS

Minimum: 1600 IOPS

Minimum: 800 IOPS

* Based on an average message size of 100 KB.

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

Last modified: 3/16/2021 12:30:07 PM