Administrator Guide

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, modies, 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) conguration settings for the group, including information about
enhanced transmission selection (ETS), trac class groups, and lossless priorities.
Table 229. DCB Details Dialog Box
Field Description
Data center bridging
Data Center Bridging (DCB) Indicates whether data center bridging (DCB) is on or o.
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 unied fabric for dierent types and priorities of data trac in the conguration.
The DCB enhancements are intended to:
• Improve Ethernet performance.
• Reduce or eliminate lost packets for lossless trac 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 dene classes of trac, which can have diering 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 trac class prioritization—Ability to provide dierent
service characteristics to trac 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 unied fabric for converged SAN and LAN for improved scalability and
performance.
Trac Classes Indicates which trac classes are in use:
436
Reference: GUI Panels, Wizards, and Dialog Boxes