Manualshelf

Users Guide

ManualsBrandsDell ManualsAccess PlatformsPowerSwitch S4248FB-ON /S4248FBL-ON
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Table Of Contents
You can use manual rebalancing when you:
Add new FC uplink to a balanced system
Consider a topology with the following structure:
● NPG switch with two FC uplinks (fc 1/1/1 and fc 1/1/2) of the same speed (16G)
● Ports connecting to both FCoE and FC end points (eth 1/1/54, eth 1/1/55, fc 1/1/9 and fc 1/1/10)
All the end points (servers) are logged in to the storage through the NPG switch. One FLOGI session is associated with each
server.
The NPG switch has four sessions that need to be mapped between two FC uplink (fc 1/1/1 and fc 1/1/2).
The NPG switch maps two sessions from eth 1/1/54 and eth 1/1/55 to fc 1/1/1, and two sessions from fc 1/1/9 and 1/1/10 to fc
1/1/2 to maintain a balanced state.
When you add two more FC uplinks, fc 1/1/3 and fc 1/1/4 in the NPG switch, the system becomes unbalanced. Issue a manual
rebalance CLI command to move the system back to a balanced state, with each FC uplink (fc 1/1/1, fc 1/1/2. fc 1/1/3 and fc
1/1/4) having one session each.
Receive session log out (FLOGO or CVL) from the end points
Consider the NPG switch with:
● two FC uplinks (fc 1/1/1 and fc 1/1/2) of the same speed(16 G)
● four ports (eth 1/1/54, eth 1/1/55, fc 1/1/9 and fc 1/1/10) connecting the FC and FCoE end points
Each end point has one session associated with it. The NPG switch maps two sessions to each FC uplink to balance the system.
Consider both the FC end points sending a session termination request (FLOGO) to the NPG switch. The system closes the
sessions in fc 1/1/10, and the system moves to an unbalanced state.
When you bring two more FC uplinks fc 1/1/3 and fc 1/1/4 in the NPG switch, the system becomes unbalanced. Issue a manual
rebalance CLI command to move the system back to a balanced state, with each FC uplink (fc 1/1/1, fc 1/1/2. fc 1/1/3 and fc
1/1/4) having one session each.
Now consider both the FC end points sending a session termination request (FLOGO) to the NPG switch. The system closes the
sessions in fc 1/1/10, and moves to an unbalanced state.
When you issue the manual rebalance command, the system redistributes the session so that the FC uplinks (fc 1/1/1 and fc
1/1/2) have one session each.
Fibre Channel
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