Upgrading Nexus 5548UP switches and physical reboot

[from88]

Hello,

We're planning to upgrade 5548UP to new version. Currently it's 6.0(2)N2(4). I know i need to to make three upgrade path steps to do it correctly:

I see sometimes on upgrade process we're getting this default message:

Module 1: Refreshing compact flash and upgrading bios/loader/bootrom/power-seq.
Warning: please do not remove or power off the module at this time.
Note: Power-seq upgrade needs a power-cycle to take into effect.
Use command 'reload power-cycle'
Note: Micro-controller upgrade needs a power-cycle to take into effect.
On success of micro-controller upgrade, SWITCH OFF THE POWER to the system and then, power it up.
SUCCESS

My question about that warning is about "SWITCH OFF THE POWER" meaning - isn't it would be enough to do reload power-cycle ? Would i really need to go into the DC and make a physical reload ? Thanks

Also, i google a message  "Once you've upgraded to either NX-OS version 4.2(1)N1(1) or 5.0(2)N1(1) and above, and completed the power cycle, then the power sequencer will be the correct level. Any subsequent NX-OS upgrades will not require the power cycle." which says that if my version is already newer than 5.0(2)N1(1) i would not need to do a power cycle for power sequence update.

On the other hand i see the old log which had updated the power sequencer:

Images will be upgraded according to following table:
Module             Image         Running-Version             New-Version  Upg-Required
------  ----------------  ----------------------  ----------------------  ------------
     1            system             7.0(2)N1(1)             7.0(7)N1(1)           yes
     1         kickstart             7.0(2)N1(1)             7.0(7)N1(1)           yes
     1              bios      v3.6.0(05/09/2012)      v3.6.0(05/09/2012)            no
     1         power-seq                    v2.0                    v3.0           yes
     1            SFP-uC                v1.1.0.0                v1.0.0.0            no
     2         power-seq                    v1.0                    v1.0            no
     3         power-seq                    v5.0                    v5.0            no
   100             fexth             7.0(2)N1(1)             7.0(7)N1(1)           yes
   101             fexth             7.0(2)N1(1)             7.0(7)N1(1)           yes
   102             fexth             7.0(2)N1(1)             7.0(7)N1(1)           yes
     1   microcontroller                v1.2.0.1                v1.2.0.1            no

But as i understand from 5.x version the upgrade of power seq doesnt require physical reboot.

Do i'm right ? Thanks

[Sergiu.Daniluk · Accepted solution]

Hi @from88 

Any power seq upgrade only requires "reload power-cycle" command. On the other hand, micro controller upgrade required you to physically remove the power cable and put it back.

Cheers,

Sergiu

[fracjackmac]

Excellent clarification!

Thanks @Sergiu.Daniluk