| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Active_client_logons |
The number of active client logons into the Information store
|
Number
|
When a MAPI client (outlook) connects, the first request to the server will establish a session. Once the session is established, the client will make a request to logon to the current session. Sometimes, the number of Active client logons can be larger than the number of mailboxes on the server. This may be caused by any of the following:
- A client frequently keeps more than one logon per session. Thus, each user that is reading mails may have 2 (or more) active logons.
- Additionally, it includes users from other databases or other servers who are logged on to other users' mailboxes (such as in the case of checking calendar tasks, if the users have shared their calendars)
- If the users are logging on and logging off frequently.
In short, Active client logons are incremented with each logon, and removed every 10 minutes if they are inactive. If clients are logging on multiple times in a 10 minute period, the active client logons number can be higher than "Client logons".
|
| Client_logons |
The number of 'distinct' users logging into their information store
|
Number
|
This measure is a good indicator of user activity in the Exchange Server. This information can be used by the administrator for planning the capacity of the mail server.
|
| Mail_send_qsize |
The number of messages in the send queue of an information
store
|
Number
|
This measure is usually zero under normal conditions.
This measure can be non-zero in the case of very busy systems.
|
| Mail_rcvd_qsize
|
This measure
shows the number of messages in the receiving queue of the information
store. |
Number
|
This measure is usually zero under normal conditions.
A non-zero value for this measure indicates that the SMTP service
is taking up excessive memory.
|
| Mails_open_rate
|
This measure
indicates the rate at which the requests to open the messages are
being submitted to the information store. |
Msgs/Sec
|
This measure shows the overall picture of user activity. An abnormally
high value for this measure may indicate that the Exchange Server
is overloaded.
|
| Mails_sent_rate
|
This measure
indicates the rate at which messages are sent by the information store. |
Msgs/Min
|
|
| Avg_mail_delvry_time
|
This measure
indicates the average time between the submission of a message to the
information store and the submission to other storage providers for
the last 10 messages. |
Secs
|
A non-zero value for this measure indicates a change in user workload.
An abnormally high value for this measure indicates inability to
deliver to one or more destinations. One of the possible reasons for
this can be a network failure.
Note that this measure will not be available for an Exchange 2007 server.
|
| Avg_mail_local_delvry_time
|
This measure
indicates the average time between the submission of a message to the
information store and the delivery to all local recipients (recipients
on the same server) for the last 10 messages. |
Secs
|
A non-zero value for this measure indicates a change in the user
workload.
An abnormally high value for this measure may indicate that the
server is overloaded.
|