Windows iscsi performance counters

The first problem I ran into was finding the counter on any of my computers. The reason for this is that when we establish a session with an iSCSI target we query to find out how many commands the device can hold. This is used in the calculation below. When we send the device a request, we start a timer. A provider will publish data for one or more countersets. For example, a database system might register itself as a performance data provider.

A counterset is a grouping of performance data within a provider. A counterset has a name and one or more counters. Collecting the data from a counterset returns a number of instances. In some Windows APIs, countersets are called performance objects.

For example, a performance data provider for a database system might provide a counterset for per-database statistics.

A counter is the definition of single piece of performance data. A counter has a name and a type. An instance is an entity about which performance data is reported. An instance has a name string and one or more counter values. For example, a "per-database statistics" counterset might contain one instance per database. The instance name would be the database name, and each instance would contain counter values for "transactions per second", "memory usage", and "disk usage" counters.

A counter value is the value of a single piece of performance counter data. A counter value is an unsigned integer, either bit or bit depending on the type of the corresponding counter. When talking about an instance , a counter value might sometimes be called a counter or a value. It might be helpful to relate performance counter terms to more familiar spreadsheet terms. A counterset is like a table. A counter is like a column.

An instance is like a row. A counter value is like a cell in the table. Single-instance countersets always contain data for exactly one instance. This is common for countersets that report system-global statistics. Diskperf -YV. The computer must be a Windows system. We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time.

Thanks for helping make community forums a great place. Office Office Exchange Server. Not an IT pro? Resources for IT Professionals. Sign in. United States English. The machine should be rebooted after making any of these registry changes. Warning - This command will cause a network adapter reset unless the -NoRestart switch is used.

If -NoRestart is used, you must manually restart the network adapter via the Windows UI or script to reset the network adapter and activate the power management setting. For more information, refer to this Microsoft documentation. Enabling either or both of these Digests does require additional CPU usage on the initiator as well as the target to calculate and append checksums. This process occurs bi-directionally incoming and outgoing on the initiator and the target.

Every storage environment is unique and when altering settings such as Digests, it must first be fully tested to accurately assess overall impacts on IOPS and CPU performance on the iSCSI network and participating devices. In our lab testing, we found slight to moderate increases in CPU overhead based on load when these options were enabled, with a minor effect on IOPS.