# Hardware Guidelines for the Exchange Online Index Server

Important

Hardware Guidelines are applicable only to on-premises and self-managed deployments.

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

For more information, see Installing Index Store Package and Port Requirements for Commvault.

## Brief Indexing

If you use content indexing, follow these guidelines. The guidelines account for backup, cleanup, and content indexing. The entire message is content indexed. If you are using one Index Server for both Exchange backups and Exchange data sources in Sensitive Data Governance, size up to the larger specification.

The following fields are searchable with brief indexing:

- To

- Cc

- Bcc

- Subject

- Date range

- Attachment name

- Email and attachment body

Environment | Small | Medium | Large
--- | --- | --- | ---
Application | 5 TB | 15 TB | 25 TB
Mailboxes | 400 | 2,000 | 5,000
Objects per node (estimated) | 50 million | 150 million | 250 million
Guidelines |  |  |
CPU or vCPU | 8 cores | 16 cores | 16 cores
RAM | 16 GB | 32 GB | 64 GB
Index disk | 2 TB | 6 TB | 10 TB
Index disk IOPS | Minimum: 800 | Minimum: 1,600 | Minimum: 2,400

## Basic Indexing

If you do not use content indexing, follow these guidelines. The guidelines account for backup and cleanup.

The following fields are searchable with basic indexing:

- To

- Cc

- Bcc

- Subject

- Date range

- Attachment name

Environment | Small | Medium | Large
--- | --- | --- | ---
Application | 5 TB | 20 TB | 50 TB
Mailboxes | 1,000 | 4,000 | 10,000
Objects per node (estimated) | 350 million | 1 billion | 2 billion
Guidelines |  |  |
CPU or vCPU | 4 cores | 8 cores | 16 cores
RAM | 8 GB | 16 GB | 32 GB
Index disk | 500 GB | 1.5 TB | 3 TB
Index disk IOPS | Minimum: 400 Recommended: 600 | Minimum: 600 Recommended: 800 | Minimum: 800 Recommended: 1,600

## Assumptions

The guidelines are based on the following assumptions:

- The average mailbox size is 5 GB.

- The average number of messages in each mailbox is 50,000.

- The average message size is 100 KB.

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