DIObject performance notes

Each DAGroup (Scan Group, Block Read, Block Write) has a maximum capacity of 5000 items. For optimal performance, the group should not have more than 4000 items.

Note that for each DAGroup added, an additional connection to the server is created. This extra connection increases the memory requirement on the server. If a decision needs to be made between either increasing the number of DAGroups or increasing the number of items in each DAGroup, the recommendation is to put more items in each DAGroup.

As each DAServer's performance is subject to the requirements of the connecting devices and the protocols being used, it is also recommended to monitor the DAServer performance levels and adjust the maximum number of items that subscribe to the DAServer.

For optimal performance, the CPU consumed by DAServers on each machine should be no more than 55% when items are constantly subscribed.