Merge Two Stacks
You may merge two stacks while they are powered and online.
To merge two stacks, connect one stack to the other using user port cables from the front end user portusing
the mini-SAS cables from the stacking ports.
• Dell Networking OS selects a master stack manager from the two existing managers based on the
priority of the stack.
• Dell Networking OS resets all the units in the losing stack; they all become stack members.
• If there is no unit numbering conflict, the stack members retain their previous unit numbers. Otherwise,
the stack manager assigns new unit numbers, based on the order that they come online.
• The stack manager overwrites the startup and running config on the losing stack members with its own
to synchronize the configuration on the new stack members.
Split a Stack
To split a stack, unplug the desired stacking cables.
You may do this at any time, whether the stack is powered or unpowered, and the units are online or offline.
Each portion of the split stack retains the startup and running configuration of the original stack.
For a parent stack that is split into two child stacks, A and B, each with multiple units:
• If one of the new stacks receives the master and the standby management units, it is unaffected by the
split.
• If one of the new stacks receives only the master unit, that unit remains the stack manager, and Dell
Networking OS elects a new standby management unit.
• If one of the new stacks receives only the standby unit, it becomes the master unit of the new stack, and
Dell Networking OS elects a new standby unit.
• If one of the new stacks receives neither the master nor the standby management unit, the stack is reset
so that a new election can take place.
Stacking Configuration Tasks
Following are the stacking configuration tasks:
• Assigning Unit Numbers to Units in a Stack
• Creating a Virtual Stack Unit in a Stack
• Displaying Information About a Stack
• Influencing Management Unit Selection on a Stack
• Managing Redundancy on a Stack
• Resetting a Unit on a Stack
• Recover from Stack Link Flaps
Stacking 1029
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