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Dell EMC SmartFabric OS10 User Guide Release 10.5.0

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Re-balance the FC sessions

Rebalances the FC sessions across FC uplinks.

Syntax
re-balance fc npg sessions vfabric vfabric-id [dry-run][brief]
Parameters
None
Default
Not configured
Command Mode
EXEC
Usage Information

Triggers the load balancing mechanism to redistribute the sessions across the FC uplinks.

The 'dry-run' option displays the current state of the system, sessions cleared, and the system state after the load balancing is done without actually doing it. You can use the "brief" option (both in dry run and actual run) to view only the session redistribution information.

This command is supported in the NPG mode.

The following table list the fields and description displayed in this command:

Table 1. Fields and DescriptionsFields and Descriptions
Fields Description
Uplink Intf The name of the FC uplink interface
FLOGI Number of Fabric Login Sessions in the FC uplink interface
FDISC Number of Fabric Discovery Sessions in the FC uplink interface
Load Total number of sessions (FLOGI and FDISC) in the FC uplink interface
Speed Link speed of the FC uplink interface
Excess Load

Excess load is the absolute (Current load on the link - ((Minimum load per 8G speed in current state) * port-speed/8G)). It captures the level to which the corresponding link is over-subscribed when compared to other FC upstream links in the system.

Node WWPN World Wide Port Name is used for the Fabric Login Request of the Server that is connected to the OS10 switch. It can be a FCoE server or a FC server.
From Uplink Intf

Interface name of the FC uplink from which the sessions from the server are redistributed.

To Uplink Intf Interface name of the FC uplink to which the sessions are mapped when the server logins.
No. of sessions

Count of redistributed sessions.

Example 
OS10#re-balance npg sessions vfabric 100 dry-run

Fabric Id 100 Current State 
Uplink      FLOGI   FDISC   Load   Speed             Excess    
Intf                               (Gbps)            Load
----------------------------------------------------------------
Fc 1/1/1    1       9       10     8                 7             
Fc 1/1/2    3       3       6      16                0            
----------------------------------------------------------------      
            4       12      16     24                7            
----------------------------------------------------------------
Session Displacements:

Total No. of Node(s)      :  4
No. of Node(s) displaced  :  4
-----------------------------------------------------------------------------------------
Node WWPN                      From Uplink Intf       To Uplink Intf     No.of sessions
-----------------------------------------------------------------------------------------
20:01:d4:ae:52:1a:ee:54        Fc 1/1/1               Fc 1/1/2           10
21:01:d4:ae:52:1a:ee:54        Fc 1/1/2               Fc 1/1/1           2
22:01:d4:ae:52:1a:ee:54        Fc 1/1/2               Fc 1/1/1           2
23:01:d4:ae:52:1a:ee:54        Fc 1/1/2               Fc 1/1/1           2

Fabric Id 100 State after Re-balancing
Uplink      FLOGI   FDISC     Load   Speed           Excess   
Intf                                 (Gbps)          Load
-------------------------------------------------------------------
Fc 1/1/1    3       3         6      8               1
Fc 1/1/2    1       9         10     16              0
-------------------------------------------------------------------
            4       12        16     24              1 
-------------------------------------------------------------------
OS10#re-balance npg sessions vfabric 100 dry-run brief

Fabric Id 100 Session Displacements:

Total No. of Node(s) : 4
No. of Node(s) displaced : 4
----------------------------------------------------------------------------------------
Node WWPN                       From Uplink Intf       To Uplink Intf    No.of sessions
----------------------------------------------------------------------------------------
20:01:d4:ae:52:1a:ee:54         Fc 1/1/1               Fc 1/1/2          10
21:01:d4:ae:52:1a:ee:54         Fc 1/1/2               Fc 1/1/1          2
22:01:d4:ae:52:1a:ee:54         Fc 1/1/2               Fc 1/1/1          2
23:01:d4:ae:52:1a:ee:54         Fc 1/1/2               Fc 1/1/1          2
OS10#re-balance npg sessions vfabric 100 

Fabric Id 100 State before Re-balancing
Uplink      FLOGI   FDISC    Load    Speed            Excess     
Intf                                 (Gbps)           Load
----------------------------------------------------------------- 
Fc 1/1/1    1       9        10      8                7              
Fc 1/1/2    3       3        6       16               0             
----------------------------------------------------------------- 
            4       12       16      24               7            
-----------------------------------------------------------------

Session Displacements:

Total No. of Node(s) : 4
No. of Node(s) displaced : 4
-------------------------------------------------------------------------------------
Node WWPN                    From Uplink Intf      To Uplink Intf      No.of sessions
-------------------------------------------------------------------------------------
20:01:d4:ae:52:1a:ee:54      Fc 1/1/1              Fc 1/1/2            10
21:01:d4:ae:52:1a:ee:54      Fc 1/1/2              Fc 1/1/1            2
22:01:d4:ae:52:1a:ee:54      Fc 1/1/2              Fc 1/1/1            2
23:01:d4:ae:52:1a:ee:54      Fc 1/1/2              Fc 1/1/1            2

Fabric Id 100 Expected State after Re-balancing
Uplink      FLOGI    FDISC     Load     Speed           Excess   
Intf                                    (Gbps)          Load
---------------------------------------------------------------------
Fc 1/1/1    3        3         6        8               1                
Fc 1/1/2    1        9         10       16              0               
---------------------------------------------------------------------
            4        12        16       24              1               
---------------------------------------------------------------------
Supported Releases
10.4.0E(R1) or later

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