Category Archives: Server and Storage

Data Center
– Server
– Storage

SAN Switching | FC Configuration


MDS# show vsan port membership (Default VSAN1)
# VSAN Database
# VSAN 101 ISCI1/1
# VSAN 101 F2/9

# Int F2/9
# switchport speed 2000 (Default Config)
# switchport mode F (F – Goes toward the Initiator & Target)
# no shutdown

Note: E port is the link between switches.

# Int f2/5
# switchport mode E
# switchport rate-mode dedicated (Guaranteed the BW)

# show port resources module 2
Ratio / Bandwidth (Older Version)
Note: Newer version is line rate.

N5k# feature fcoe (To enable fcoe)
# show module
-> 2 Generic Expansion module (Dedicated fiber port)

# int fc2/1
# switchport mode E
# no shutdown

# Eth e111/1/1
# switchport mode trunk

# int vfc 111
# bind e111/1/1
# no shutdown

# VSAN database
# VSAN 101
# VSAN 101 int vfc 111
# Exit

# Vlan 101
# fcoe VSAN 101
# End

SAN Switching| NPV

NPV Overview
By default, Cisco Nexus 5000 Series switches operate in fabric mode. In this mode, the switch provides standard Fibre Channel switching capability and features.

In fabric mode, each switch that joins a SAN is assigned a domain ID. Each SAN (or VSAN) supports a maximum of 239 domain IDs, so the SAN has a limit of 239 switches. In a SAN topology with a large number of edge switches, the SAN may need to grow beyond this limit. NPV alleviates the domain ID limit by sharing the domain ID of the core switch among multiple edge switches.

In NPV mode, the edge switch relays all traffic from server-side ports to the core switch. The core switch provides F port functionality (such as login and port security) and all the Fibre Channel switching capabilities.

The edge switch appears as a Fibre Channel host to the core switch and as a regular Fibre Channel switch to its connected devices.


NPV Mode
In NPV mode, the edge switch relays all traffic to the core switch, which provides the Fibre Channel switching capabilities. The edge switch shares the domain ID of the core switch.

To convert a switch into NPV mode, you set the NPV feature to enabled. This configuration command automatically triggers a switch reboot. You cannot configure NPV mode on a per-interface basis. NPV mode applies to the entire switch.

In NPV mode, a subset of fabric mode CLI commands and functionality is supported. For example, commands related to fabric login and name server registration are not required on the edge switch, because these functions are provided in the core switch. To display the fabric login and name server registration databases, you must enter the show flogi database and show fcns database commands on the core switch.

Server Interfaces
Server interfaces are F ports on the edge switch that connect to the servers. A server interface may support multiple end devices by enabling the N port identifier virtualization (NPIV) feature. NPIV provides a means to assign multiple FC IDs to a single N port, which allows the server to assign unique FC IDs to different applications.

Note To use NPIV, enable the NPIV feature and reinitialize the server interfaces that will support multiple devices. For additional information about NPIV, see the “About N Port Identifier Virtualization” section.

Server interfaces are automatically distributed among the NP uplinks to the core switch. All of the end devices connected to a server interface are mapped to the same NP uplink.

In Cisco Nexus 5000 Series switches, server interfaces can be physical or virtual Fibre Channel interfaces.

NP Uplinks (External Interfaces)
All interfaces from the edge switch to the core switch are configured as proxy N ports (NP ports).

An NP uplink is a connection from an NP port on the edge switch to an F port on the core switch. When an NP uplink is established, the edge switch sends a fabric login message (FLOGI) to the core switch, and then (if the FLOGI is successful) it registers itself with the name server on the core switch. Subsequent FLOGIs from end devices connected to this NP uplink are converted to fabric discovery messages (FDISCs). For additional information about fabric login, see the “Information About Fabric Login” section.

Cisco Nexus 5000 Series NX-OS Software Configuration Guide

Troubleshooting NPort Virtualization

Switch Fabric- Troubleshooting tips

Cisco Storage Platform

Multilayer Director Switches (MDS)
• 9700 Directors
• 9300/9200/9100 Switches
Main difference is just throughput and port density.

• 7700/7000 FCoE Switches
• 5000/6000 Fibre channel and FCoE Switches

7k’s is a FCoE switch only and it doesn’t support native fiber channel. There’s no line card the support FC only Ethernet line cards. From a line card support point of view FCoE only supported at the F card F1, F2, F3 and F4.


Note that the box does requires reboot when you reallocate interfaces.

Rack Mounted Server


Headless Design System – Server that operates without a monitor or keyboard and mouse connected to them.

U – is the standard unit of measure for designating the vertical usable space, or height of racks and cabinets.

DIMM – Dual In-Line Memory Module
Note: As you add more memory, you may get un-optimal configuration. Depends on application requirement.

UCS Servers


Legacy Blade Architecture


Blade server is a cost of acquisition and operation is less than traditional servers. Also the hassle of cables is less in blade server. Blade Server take up less space, because it is possible to locate sixteen (16) servers within one rack. Blade server is claimed to be less prone to failure because each server blade contains no mechanical elements. Over heating is a serious issue in blade server due to the pattern has to be same usage under ideal condition.