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.
With Content Indexing
If you use content indexing, follow these guidelines. The guidelines account for backup, cleanup, and content indexing. The entire message is content indexed.
|
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 |
Without Content Indexing
If you do not use content indexing, follow these guidelines. The guidelines account for backup and cleanup.
|
Environment |
Small |
Medium |
Large |
|---|---|---|---|
|
Application |
5 TB |
20 TB |
50 TB |
|
Mailboxes |
1,000 |
4,000 |
10,000 |
|
Objects per node (estimated) |
50 million |
200 million |
500 million |
|
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 |
|
|
|
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.