Hard drive utilization for the drive that holds the message queue database The following sections explain how Exchange handles the situation when a specific resource is under pressure. You need to know if the utilization is increasing or decreasing before you can determine the next change in resource utilization level. In other words, there really isn't a static value for low, medium and high resource pressure. Typically, a resource utilization level that's lower than the original level is required as the resource utilization decreases. Transition levels define the low, medium and high resource utilization values depending on whether the resource pressure is increasing or decreasing. All message flow stops, and the server rejects all new incoming MAIL FROM commands.
High: The resource is severely overused. However, depending on the specific resource under pressure, the server uses tarpitting to delay server response or rejects incoming MAIL FROM commands from other sources. Mail from senders in the organization's authoritative domains can flow. Back pressure is applied to the server in a limited manner. Medium: The resource is slightly overused. The server accepts new connections and messages. Low or Normal: The resource isn't overused. UsedVersionBuckets: The number of uncommitted message queue database transactions that exist in memory.įor each monitored system resource on a Mailbox server or Edge Transport server, the following levels of resource utilization or pressure are defined:. UsedDiskSpace: Hard drive utilization for the drive that's used for content conversion. UsedDiskSpace: Hard drive utilization for the drive that holds the message queue database transaction logs. SystemMemory: The memory that's used by all other processes. QueueLength: The number of messages in the Submission queue. PrivateBytes: The memory that's used by the EdgeTransport.exe process. DatabaseUsedSpace: Hard drive utilization for the drive that holds the message queue database. The following system resources are monitored by back pressure: When the system resource utilization returns to an acceptable level, the Exchange server resumes normal operation by accepting new messages and processing outgoing messages. If the resource utilization gets worse, the server stops accepting new messages to work exclusively on processing all existing messages, and might even stop processing outgoing messages. For example, when a system resource utilization level on the Exchange server is determined to be too high, the server delays accepting new messages. Back pressure detects when vital system resources, such as hard drive space and memory, are overused, and takes action to prevent the server from becoming completely overwhelmed and unavailable. 
Back pressure is a system resource monitoring feature of the Microsoft Exchange Transport service that exists on Mailbox servers and Edge Transport servers.
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