Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 436

Date and Time Panel Table 228. Date and Time Panel Field Description Shortcut Time zone Time zone where the group is located. All members of a group share the same time zone. Each array's clock is set at the factory, based on GMT. The default time zone is America/New York, EST (Eastern Standard Time). Alt+T Current group time Group time is initially based on the time set on the array that was used to create the group. Each array that you add updates its clock to match the group's date and time. The group date and time determines the timestamp used to identify some objects (snapshots or replicas, for example) that you create on the group. Changing the time is a groupwide operation and updates all members. Alt+C NTP servers (in order of preference) Adds, modifies, or removes Network Time Protocol (NTP) servers used by the group. You can specify that the group use up to three external NTP servers to automatically set the same time for all the group members. Use the Up and Down arrows to change the order of the servers in the list. None DCB Details Dialog Box The DCB Details dialog box lists data center bridging (DCB) configuration settings for the group, including information about enhanced transmission selection (ETS), traffic class groups, and lossless priorities. Table 229. DCB Details Dialog Box Field Data center bridging Description Data Center Bridging (DCB) Indicates whether data center bridging (DCB) is on or off. DCB is a set of extensions to IEEE Ethernet standards, intended to improve the performance, controllability, and reliability of the Ethernet fabric. DCB can make Ethernet the unified fabric for different types and priorities of data traffic in the configuration. The DCB enhancements are intended to: • Improve Ethernet performance. • Reduce or eliminate lost packets for lossless traffic classes. Originally, Ethernet was developed as a method for delivery over a shared medium, while leaving the transport layers to cater for the reliability aspect of the communication. • Provide the ability to define classes of traffic, which can have differing bandwidth, priority, and frame loss characteristics, enabling: - Pause per class - Ability to independently pause based on user priorities or classes of service. - Bandwidth allocation or traffic class prioritization-Ability to provide different service characteristics to traffic classes. - End-to-end congestion management - Ability to notify sender of rate limiting transmission to avoid frame loss. • Enable deterministic performance during congestion. • Provide a unified fabric for converged SAN and LAN for improved scalability and performance. Traffic Classes Indicates which traffic classes are in use: 436 Reference: GUI Panels, Wizards, and Dialog Boxes