Users Guide

4 2 up AC up 7920
-- Fan Status --
Unit Bay TrayStatus Fan1 Speed Fan2 Speed
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4 1 up up 7058 up 7058
Speed in RPM
<output truncated>
A change in the stack master occurs when:
• You power down the stack master or bring the master switch offline.
• A failover of the master switch occurs.
• You disconnect the master switch from the stack.
When a stack reloads and all the units come up at the same time; for example, when all units boot up from
flash, all units participate in the election and the master and standby are chosen based on the priority or MAC
address.
When the units do not boot up at the same time, such as when some units are powered down just after
reloading and powered up later to join the stack, they do not participate in the election process even though
the units that boot up late may have a higher priority configured. This happens because the master and
standby have already been elected, hence the unit that boots up late joins only as a member.
When an up and running standalone unit or stack is merged with another stack, based on election, the losing
stack reloads and the master unit of the winning stack becomes the master of the merged stack. For more
details, see sectionsAdd Units to an Existing Stack and Remove a Unit from a Stack. It is possible to reset
individual units to force them to give up the management role or reload the whole stack from the CLI to
ensure a fully synchronized bootup.
Example of Viewing Stack Members
Dell#show system brief
Stack MAC : 34:17:17:18:19:1e
Reload-Type : normal-reload [Next boot : normal-reload]
-- Stack Info --
Unit UnitType Status ReqTyp CurTyp Version Ports
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1 Member online S3124F S3124F 1-0(0-4679) 30
2 Member online S3124 S3124 1-0(0-4679) 30
3 Member online S3124 S3124 1-0(0-4679) 30
4 Member online S3148P S3148P 1-0(0-4679) 54
5 Standby online S3148P S3148P 1-0(0-4679) 54
6 Member online S3148P S3148P 1-0(0-4679) 54
7 Member online S3124F S3124F 1-0(0-4679) 30
8 Member online S3124P S3124P 1-0(0-4679) 30
9 Member online S3124F S3124F 1-0(0-4679) 30
10 Member online S3148P S3148P 1-0(0-4679) 54
11 Member online S3124F S3124F 1-0(0-4679) 30
12 Management online S3148P S3148P 1-0(0-4679) 54
-- Module Info --
Unit Module No Status Module Type Ports
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1 1 not present No Module 0
Stacking 926