This document provides an overview of Fibre Channel protocol and components. It describes the Fibre Channel layered architecture including FC-0 through FC-4 layers. It covers Fibre Channel frames, exchanges, sequences, flow control, addresses, port initialization process and common fabric services. Key topics include Fibre Channel protocol makeup, components, transceivers, cables, switches, host bus adapters, world wide names, and fabric login process.
This document discusses SCSI-3 Persistent Group Reservation (PGR) on Symm arrays. It describes how PGR allows initiators to register reservation keys to lock devices, provides persistent locks even if hosts shut down, and has a limit of 340 registrations per device. It also discusses how to check PGR status, enable PGR on ports and devices, and clear PGR locks using inline commands. Case studies show examples of using these techniques to resolve PGR issues preventing cluster creation and causing device errors.
The document discusses three-phase distribution mode in a data replication system. It explains that three-phase distribution is triggered when there are issues with copy or journal storage performance or when the journal lag exceeds the maximum journal lag setting. It also describes how and when the system returns to five-phase distribution mode from three-phase mode.
This document provides an introduction and overview of EMC's FAST VP technology for tiered storage. It discusses FAST VP concepts and components, how FAST VP differs from traditional FAST, when each is appropriate, and how FAST VP implements compression to improve storage efficiency. The document also covers FAST VP documentation resources, error codes, review of key concepts, details on compression techniques and performance, and a case study example. Administration and configuration using SYMCLI commands is demonstrated.
This document provides an overview of how to use SYMCLI commands to manage FAST VP on an EMC Symmetrix array. It discusses setting the required FAST VP license, creating performance and move time windows to control when data movement can occur, and checking the status of FAST VP. Managing FAST VP through SYMCLI allows enabling and disabling FAST VP, setting analysis periods and thresholds, and ensuring time windows are configured to optimize data placement.
This document provides an overview of FAST VP elements and terminology. It explains that FAST VP measures performance at the sub-LUN level and can move individual extents between tiers based on activity. VP tiers contain thin storage pools from the same RAID type and drive technology. FAST VP policies associate storage groups with tiers and define upper capacity limits for each tier. Storage groups contain devices managed together under a single policy.