Overview of Server Priority Manager
Server Priority Manager allows you to set upper limits of the number of accesses from the server to storage system as well as the amount of data transfer. The upper limits are automatically disabled when the traffic between the server and storage system drops to user-defined levels. Server Priority Manager supports Fibre Channel and iSCSI ports connected to open-systems hosts.
By using Server Priority Manager, you can designate prioritized ports (for example, for production servers) and non-prioritized ports (for example, for development servers) and set upper limits and thresholds for the I/O activity of these ports to prioritize I/O operations to host servers requiring high-throughput I/O operations and prevent low-priority activities from negatively impacting high-priority activities.
You can also control the I/O priority for individual volumes (LDEVs) in a storage system by using RAID Manager. When you use RAID Manager to configure LDEV-level Server Priority Manager operations, you can specify an LDEV and a WWN or iSCSI name of a host adapter. Within a single storage system, you can use only one of the following two methods to set I/O priority level: you can specify ports (GUI or CLI), or you can specify LDEVs (CLI only). For important information about using RAID Manager to perform Server Priority Manager operations, see the RAID Manager Command Reference.