Information Store

This resource contains performance counters specific to the status of the current Information Store. The icons of the listed performance counters in the Statistic Name column changes color to reflect the listed counter's current state. Clicking any performance counter in the Statistic Name column takes you to the Performance Counter Details page for that counter.

If the value of a listed performance counter approaches or crosses the Warning threshold, a yellow band will appear for the listed counter allowing plotted values that cross the threshold to easily be visualized against the yellow band. If the value of a listed performance counter approaches or crosses the Critical threshold, a red band will appear for the listed counter allowing plotted values that cross the threshold to easily be visualized against the red band. Hovering over any time period within the chart will display detailed information about that time period in the tooltip. Hovering over a counter will give you detailed information about that performance counter.

The Exchange Information Store is a storage platform that is used to manage numerous types of information within an Exchange server deployment.

The following table lists the default performance counters for this resource along with their respective definitions and troubleshooting information, including default Warning and Critical thresholds:

Counter Expert Knowledge

Warn-ing

Criti-
cal

Connection Count

(Only available in Exchange 2013)

Definition: 
Is the total number of client connections maintained.

Information: 
This is used to determine current load of the server's Information Store.

Possible problems:
May cause memory bottlenecks on the server if the number is excessively high.

Remediation:
Reduce the number of user mailboxes hosted on the server or increase available resources.

N/A

N/A

Active User Count

Definition:
Number of user connections that have shown some activity in the last 2 minutes.

Information: 
Used to determine current user load on the server. Each active user typically starts up to 5 active sessions (connections) on a server, in order to sync various services.

Possible problems:
May cause memory bottlenecks on the server if the number is excessively high.

Remediation:
Determine if users are running applications not required for business use, and request they do not run these applications which is causing an increase in server logons. If this does not help, or is not possible, reduce the number of users hosted on the server and move any Public Folders on the server to a different server.

N/A

N/A

RPC Averaged Latency

Definition:
Indicates the RPC latency, in ms, averaged for all operat
ions in the last 1,024 packets.

Information: 
For information about how clients are affected when overall server RPC averaged latencies increase, see “Understanding Client Throttling Policies” at
http://technet.microsoft.com/en-us/library/dd297964.aspx. Should not be higher than 100 ms on average.

Possible problems: 
To determine if certain protocols are causing overall RPC latencies, monitor MSExchangeIS Client (*)\RPC Average Latency to separate latencies based on client protocol.

Remediation:
Faster disks, more disks, or redesigning existing disk arrays.

> 100 ms

> 100 ms for 15 polls

RPC Requests

Definition:
Indicates the overall RPC requests currently executing within
the information store process.

Information: 
Should be below 70 at all times.

Possible problems:
When I/O counters fall outside of normal range, client performance is directly impacted. For example, Outlook and Outlook Web App (OWA) users report “Outlook is slow” when opening mail or moving between folders.

Remediation:
Faster disks, more disks, or redesigning existing disk arrays.

> 70

> 70 for 15 polls

Active Connection Count

(Only available in Exchange 2010)

Definition: 
Number of connections that have shown some activity in the last 10 minutes.

Information: 
This is used to determine current load of the server's Information Store.

Possible problems:
May cause memory bottlenecks on the server if the number is excessively high.

Remediation:
Reduce the number of user mailboxes hosted on the server or increase available resources.

N/A 

N/A 

Client: RPCs Failed: Server too busy/sec

(Only available in Exchange 2010)

Definition: 
Shows the client-reported rate of failed RPCs (since the store was started) due to the Server Too Busy ROC error.

Information: 
Should be 0 at all times.

Possible problems:
Higher values may indicate RPC threads are exhausted or client throttling is occurring for clients running versions of Outlook earlier than Microsoft Office Outlook 2007. This can cause user mail clients experiencing slowness.

Remediation:
Check if RPC latencies are high and determine the cause of the performance issue (e.g. poorly performing disk I/O, excessive load, insufficient memory, high number of users).

> 0 for 5 polls

> 0 for 15 polls

RPC Client Backoff/sec

(Only available in Exchange 2010)

Definition: 
The rate at which the server notifies a client to withdraw (backoff).

Information: 
Indicates the rate at which client backoffs are occurring.

Possible problems:
Higher values may indicate that the server may be incurring a higher load resulting in an increase in overall averaged RPC latencies, causing client throttling to occur. This can also occur when certain client user actions are being performed. Depending on what the client is doing and the rate at which RPC operations are occurring, it may be normal to see backoffs occurring.

Remediation:
Check if RPC latencies are high and determine the cause of the performance issue (e.g. poorly performing disk I/O, excessive load, insufficient memory, high number of users).

N/A

N/A

Active Client Logons

(Only available in Exchange 2010)

Definition: 
Number of logons that have been active (issued any MAPI requests) within the last 10 minute time interval.

Information:  
Active client logons can be high if users are logging on and logging off frequently.

Possible problems:
May cause memory bottlenecks on the server if the number is excessively high.

Remediation:
Determine if users are running applications not required for business use, and request they do not run these applications which is causing an increase in server logons. If this does not help, or is not possible, reduce the number of server hosted on the server and move any Public Folders on the server to a different server.

N/A

N/A

Messages Queued for Submission

(Only available in Exchange 2010)

Definition: 
Shows the current number of submitted messages not yet pr
ocessed by the transport layer.

Information:
The queues should remain below 50 at any given time. Anything above this amount should be cleared within 15 minutes.

Possible problems:
Mailbox server is not communicating properly with the transport server.

Remediation:
Verify network connectivity and transport server functionality.

> 50 

> 50 for 15 polls

Slow FindRow Rate

(Only available in Exchange 2010)

Definition:
Shows the rate at which the slower FindRow needs t
o be used in the mailbox store.

Information: 
Should be no more than 10 for any specific mailbox store.

Possible problems: 
Higher values indicate applications are crawling or searching mailboxes, which is affecting server performance. These include desktop search engines, customer relationship management (CRM), or other third-party applications.

Remediation:
Run the ResetSearchIndex.ps1 script which is located in the scripts directory at the root of the Exchange installation. Alternatively, you can perform the process manually:

1. Rebuild the index catalog using: Update-MailboxDatabaseCopy <DBName> -CatalogOnly command.
2. Stop the Microsoft Exchange Search Service.
3. Delete old catalog files.
4. Restart Microsoft Exchange Search Service.

N/A

N/A

Zooming

You can have the chart show a predetermined time period of data by clicking on any one of the three Zoom buttons in the head of the Zoom column. Alternatively, you can have the chart show a specific date range by dragging the mouse over an area of the chart. The time and date displayed at the top of the resource shows the amount of data currently loaded into the chart. This can be changed by clicking Edit from within the resource.

The Value from Last Poll column shows the most recent data available for the listed statistic.

Additional components on certain resources may be available for addition and/or deletion on the Edit page.