What is a slow drain device?
A slow drain device is a device that does not accept frames at a rate generated by the source. In the presence of slow-drain devices, Fibre Channel networks are likely to lack frame buffers, resulting in switch port buffer starvation and potentially choking ISLs.
What is buffer credit in Brocade?
Brocade Switching Device. The number of available buffer credits defines the maximum amount of data that can be transmitted prior to an acknowledgment from the receiver. Buffer credits are physical memory resources that are incorporated in the Application-Specific Integrated Circuit (ASIC) that manages the port.
Which three classes of service are supported on Brocade Fibre Channel switches?
Classes of service
| Class | Description | Brocade supported |
|---|---|---|
| 1 | Dedicated connection allocates full bandwidth between ports. | No |
| 2 | Connectionless switch to switch communication for frame transfer and delivery | Yes |
| 3 | Connectionless switch to switch communication for frame transfer and delivery | Yes |
How many bytes make up the Standard Fibre channel frame?
Typically, the minimum frame-length of a Fibre frame is 36 bytes and the maximum frame-length of a Fibre Channel frame is 2148 bytes. Typically, a Fibre Channel device receives an incoming Fibre Channel frame when it detects a Start-Of-Frame (SOF) delimiter.
What is F port in Brocade?
The fabric port (F_port) is a fabric switch port used to connect an N_port to a switch in a fiber channel topology. It uses a fiber channel point-to-point (FC-P2P) topology – a structure connecting two fiber channel devices.
What is the purpose of WWN in FC SAN?
A World Wide Name (WWN) is a unique identifier that is hard-coded into each Fibre Channel (FC) device by the device’s manufacturer. WWNs provide a method for identifying FC devices across the network.
What is G port in Brocade?
A generic port (G_Port) is a port that supports either an E_Port or F_Port in a fiber channel (FC) switch topology. It can be found on Brocade and McData switches. The fiber channel was developed in 1988 and approved by the American National Standards Institute (ANSI) in 1994.
What is N port in FC?
N-port. Node port. Node port that connects to an F-port on an FC switch or to an N-port on another node.
What layer is fiber channel?
Fibre Channel Transport Protocol FC-0 and FC-1 are the physical layers. FC-2 is the protocol layer, similar to OSI Layer 3. FC-3 and FC-4 are the services layers.
What is difference between WWN and WWPN?
A WWPN is a World Wide Port Name; a unique identifier for each Fibre Channel port presented to a Storage Area Network (SAN). Each port on a Storage Device has a unique and persistent WWPN. A World Wide Node Name, WWNN, or WWnN, is a World Wide Name assigned to a node (an endpoint, a device) in a Fibre Channel fabric.
What is LUN masking in storage?
LUN masking is an authorization mechanism used in storage area networks (SANs) to make LUNs available to some hosts but unavailable to other hosts.
What is interface utilization?
The Interface Utilization view lists the interfaces throughout the enterprise that are the most heavily used. The view is a table summary of the interfaces whose utilization exceeds the user-configured thresholds.
What is U port SAN switch?
Quick Reference
| Short Name | Descriptive Name | Port Function |
|---|---|---|
| U-port | Universal port | Intial port state on a switch before anything has connected and it changes personality to an operation state (E-port, F-port, fl-port) or a transitional state like a g-port |