Client Access Server Counters
Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2
This topic provides information about counters relevant to the Client Access server role in Microsoft Exchange Server 2010. You can use Performance Monitor (perfmon.exe) to monitor these counters. For more information, see Performance Monitor Getting Started Guide. For information about other counters relevant to Exchange 2010, see Performance and Scalability Counters and Thresholds.
Outlook Web App Counter
The following table shows a Microsoft Office Outlook Web App counter.
| Counter | Description | Threshold |
|---|---|---|
MSExchange OWA\Average Search Time |
Shows the average time that elapsed while waiting for a search to complete. |
Should be less than 5,000 milliseconds (ms) at all times. |
ASP.NET Counters
The following table shows ASP.NET counters.
| Counter | Description | Threshold | Troubleshooting |
|---|---|---|---|
ASP.NET\Application Restarts |
Shows the number of times the application has been restarted during the Web server's lifetime. |
Should be 0 at all times. |
|
ASP.NET\Worker Process Restarts |
Shows the number of times a worker process has restarted on the computer. |
Should be 0 at all times. |
|
ASP.NET\Request Wait Time |
Shows the number of ms the most recent request was waiting in the queue. |
Should be 0 at all times. |
Values greater than 0 should be investigated. |
ASP.NET Applications(*)\Requests In Application Queue |
Shows the number of requests in the application request queue. |
Should be 0 at all times. |
Values greater than 0 should be investigated. |
Availability Service Counter
The following table shows an availability service counter.
| Counter | Description | Threshold |
|---|---|---|
MSExchange Availability Service\Average Time to Process a Free Busy Request |
Shows the average time to process a free/busy request in seconds. One request may contain multiple mailboxes. Free/busy responses don't have meeting suggestions. |
Should always be less than 5. |
ActiveSync Service Counters
The following table shows ActiveSync service counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchange ActiveSync\Ping Commands Pending |
Shows the number of ping commands currently pending on the server. |
Ping Commands Pending and Sync Commands Pending are the number of hanging requests, which should be almost equal to the number of Direct Push and hanging sync users. |
MSExchange ActiveSync\Sync Commands Pending |
Shows the number of sync commands currently pending on the server. |
Ping Commands Pending and Sync Commands Pending are the number of hanging requests, which should be almost equal to the number of Direct Push and hanging sync users. |
MSExchange ActiveSync\Current Requests |
Shows the number of HTTP requests waiting to be assigned to a thread. |
Average of 50–100. |
RPC/HTTP Proxy Counters (Windows Server 2008 Only)
The following table shows Windows Server 2008 RPC/HTTP proxy counters.
| Counter | Description | Threshold |
|---|---|---|
RPC/HTTP Proxy\Number of Failed Back-End Connection attempts per Second |
Shows the rate at which the RPC proxy attempts are occurring but failing to establish a connection to a back-end server. |
Should be 0 at all times. |
RPC/HTTP Proxy\Current Number of Incoming RPC over HTTP Connections |
Shows the current number of front-end HTTP connections. Determines current user load. |
Not applicable. |
RPC/HTTP Proxy\Current Number of Unique Users |
Shows the number of unique users currently connected to a back-end server via RPC/HTTP. Determines current user load. |
Not applicable. |
RPC/HTTP Proxy\RPC/HTTP Requests per Second |
Shows the rate of RPC/HTTP requests sent to the back-end servers. Determines current Microsoft Outlook Anywhere load. |
Not applicable. |
RPC Client Access Counters
The following table shows RPC Client Access counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchange RpcClientAccess\RPC Averaged Latency |
Shows the latency, in ms, averaged for the past 1,024 packets. |
Should be below 250 ms. |
MSExchange RpcClientAccess\RPC Operations/sec |
Shows the rate at which RPC operations occur, per second. |
|
MSExchange RpcClientAccess\RPC Requests |
Shows the number of client requests currently being processed by the RPC Client Access service. |
Shouldn't be over 40. |
Address Book Service Counters
The following table shows Exchange 2010 address book service counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchangeAB\NSPI RPC Browse Requests Average Latency |
Shows the average time, in ms, that Name Service Provider Interface (NSPI) browse requests took to complete during the sampling period. |
Should be below 1,000 ms. |
MSExchangeAB\NSPI RPC Requests Average Latency |
Shows the average time, in ms, that NSPI requests took to complete during the sampling period. |
Should be below 1,000 ms. |
MSExchangeAB\Referral RPC Requests Average Latency |
Shows the average time, in ms, that referral requests took to complete during the sampling period. |
Should be below 1,000 ms. |
Control Panel Counters
The following table shows Exchange 2010 Control Panel counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchange Control Panel\Outbound Proxy Requests - Average Response Time |
Shows the average time (in ms) that requests sent to a secondary Client Access server took to complete during the sampling period. |
The average should be under 6,000 ms. |
MSExchange Control Panel\Requests - Average Response Time |
Shows the average time (in ms) the Exchange Control Panel took to respond to a request during the sampling period. |
The average should be under 6,000 ms. |
Client Access Server OAB Download Counters
The following table shows Client Access server offline address book (OAB) download counters.
| Counter | Description | Threshold | Troubleshooting |
|---|---|---|---|
MSExchangeFDS:OAB(*)\Download Task Queued |
Shows the number of OAB download tasks queued since the File Distribution service started. |
Should be 0 at all times. |
Values greater than 0 indicate a failure to copy OAB data files from Mailbox servers. |
MSExchangeFDS:OAB(*)\Download Tasks Completed |
Shows the number of OAB download tasks completed since the File Distribution service started. The default value is every 480 minutes or 8 hours. |
Should be less than or equal to 3 per day. |
Values greater than 3 per day indicate the schedule for the Client Access server to download updated OAB files isn't a default schedule. |
Client Activity Counters
The following table shows client activity counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchangeIS\RPC Client Backoff/sec |
Indicates the rate at which client backoffs are occurring. 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. |
Not applicable. |
Client Access Server Counters
The following table shows some common Client Access server counters for determining load on your servers.
| Counter | Description | Threshold |
|---|---|---|
MSExchange ActiveSync\Requests/sec |
Shows the number of HTTP requests received from the client via ASP.NET per second. Determines the current Exchange ActiveSync request rate. Used only to determine current user load. |
Not applicable. |
MSExchange ActiveSync\Ping Commands Pending |
Shows the number of ping commands currently pending in the queue. |
Not applicable. |
MSExchange ActiveSync\Sync Commands/sec |
Shows the number of sync commands processed per second. Clients use this command to synchronize items within a folder. |
Not applicable. |
MSExchange Availability Service\Availability Requests (sec) |
Shows the number of requests serviced per second. The request can be only for free/ busy information or include suggestions. One request may contain multiple mailboxes. Determines the rate at which Availability service requests are occurring. |
Not applicable. |
MSExchange OWA\Current Unique Users |
Shows the number of unique users currently logged on to Outlook Web App. This value monitors the number of unique active user sessions, so that users are only removed from this counter after they log off or their session times out. Determines current user load. |
Not applicable. |
MSExchange OWA\Requests/sec |
Shows the number of requests handled by Outlook Web App per second. Determines current user load. |
Not applicable. |
MSExchangeAutodiscover\Requests/sec |
Shows the number of Autodiscover service requests processed each second. Determines current user load. |
Not applicable. |
MSExchangeWS\Requests/sec |
Shows the number of requests processed each second. Determines current user load. |
Not applicable. |
Web Service(_Total)\Current Connections |
Shows the current number of connections established with the Web service. Determines current user load. |
Not applicable. |
WebService(_Total)\Connection Attempts/sec |
Shows the rate that connections to the Web service are being attempted. Determines current user load. |
Not applicable. |
Web Service(_Total)\ISAPI Extension Requests/sec |
Shows the rate that Internet Server API (ISAPI) extension requests are received by the Web service. Determines current user load. Outlook Anywhere clients make use of this ISAPI extension for RPC over HTTP requests on servers running Windows Server 2003. For Windows Server 2008 counters, see "RPC/HTTP Proxy Counters (Windows Server 2008 Only)" earlier in this topic. |
Not applicable. |
Web Service(_Total)\Other Request Methods/sec |
Shows the rate HTTP requests are made that don't use the OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, MOVE, COPY, MKCOL, PROPFIND, PROPPATCH, SEARCH, LOCK, or UNLOCK methods. Determines current user load. |
Not applicable. |
Exchange Control Panel Load Counters
The following table shows Exchange 2010 Control Panel load counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchange Control Panel\ASP.Net Request Failures/sec |
Shows the number of failures per second detected by ASP.NET in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\Explicit Sign-On Inbound Proxy Requests/sec |
Shows the number of explicit sign-on requests received from a primary Client Access server per second. |
Not applicable. |
MSExchange Control Panel\Explicit Sign-On Inbound Proxy Sessions/sec |
Shows the number of explicit sign-on inbound proxy sessions loaded per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\Explicit Sign-On Outbound Proxy Requests/sec |
Shows the number of explicit sign-on requests sent to a secondary Client Access server per second. |
Not applicable. |
MSExchange Control Panel\Explicit Sign-On Outbound Session Requests/sec |
Shows the number of explicit sign-on outbound proxy sessions loaded per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\Explicit Sign-On Standard RBAC Requests/sec |
Shows the number of requests received per second by an explicit sign-on standard RBAC session. |
Not applicable. |
MSExchange Control Panel\Explicit Sign-On Standard RBAC Sessions/sec |
Shows the number of explicit sign-on standard RBAC sessions loaded per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\Inbound Proxy Requests/sec |
Shows the number of requests received from a primary Client Access server per second. |
Not applicable. |
MSExchange Control Panel\Inbound Proxy Sessions/sec |
Shows the number of inbound proxy sessions loaded per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\Outbound Proxy Requests - Average Response Time |
Shows the average time (in ms) that requests sent to a secondary Client Access server took to complete during the sampling period. |
Should be under 6,000 ms. |
MSExchange Control Panel\Outbound Proxy Requests/sec |
Shows the number of requests sent to a secondary Client Access server per second. |
Not applicable. |
MSExchange Control Panel\Outbound Proxy Sessions/sec |
Shows the number of outbound proxy sessions loaded per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\PowerShell Runspaces - Activations/sec |
Shows the number of Windows PowerShell runspaces activated per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\PowerShell Runspaces - Average Active Time |
Shows the average time (in seconds) that a Windows PowerShell runspace stays active while executing cmdlets in the Exchange Control Panel during the sampling period. |
Not applicable. |
MSExchange Control Panel\PowerShell Runspaces/sec |
Shows the number of Windows PowerShell runspaces created per second in the Exchange Control Panel. |
|
MSExchange Control Panel\RBAC Sessions/sec |
Shows the number of RBAC sessions loaded per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\Requests - Activations/sec |
Shows the number of requests activated per second in the Exchange Control Panel. |
Not applicable. |
MSExchange Control Panel\Requests - Average Response Time |
Shows the average time (in ms) the Exchange Control Panel took to respond to a request during the sampling period. |
Should be under 6,000 ms. |
Availability Service Load Counter
The following table shows an availability service load counter.
| Counter | Description | Threshold |
|---|---|---|
MSExchange Availability Service\Availability Requests (sec) |
Shows the number of requests serviced per second. The request can be only for free/busy information or include suggestions. One request may contain multiple mailboxes. Determines the rate at which Availability service requests are occurring. |
Not applicable. |
RPC Client Access Load Counters
The following table shows RPC Client Access load counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchange RpcClientAccess\Active User Count |
Shows the number of unique users that have shown some activity in the last 2 minutes. |
Not applicable. |
MSExchange RpcClientAccess\Connection Count |
Shows the total number of client connections maintained. |
Not applicable. |
MSExchange RpcClientAccess\RPC Operations/sec |
Shows the rate at which RPC operations occur, per second. |
Not applicable. |
MSExchange RpcClientAccess\User Count |
Shows the number of users connected to the service. |
Not applicable. |
Exchange Address Book Load Counters
The following table shows Exchange Address Book load counters.
| Counter | Description | Threshold |
|---|---|---|
MSExchangeAB\NSPI Connections Current |
Shows the number of NSPI clients currently connected to the server. |
Not applicable. |
MSExchangeAB\NSPI Connections/sec |
Shows the number of NSPI client connections established to the server each second. |
Not applicable. |
MSExchangeAB\NSPI RPC Requests/sec |
Shows the rate at which NSPI requests occur each second. |
Not applicable. |
MSExchangeAB\Referral RPC Requests/sec |
Shows the rate at which referral requests occur each second. |
Not applicable. |
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