What does Re-acknowledge do in UCSM?

[m1xed0s]

I never had a good understanding regarding what is the process once I started re-acknowledging UCS Chassis, blade or C-Series server...

So what kinda impact if I did re-acknowledge of chassis or blade or UCS Managed C-Series while ESXi is running on blades OR C-Series servers?

[AFROJ AHMAD · Accepted solution]

So what kinda impact if I did re-acknowledge of chassis or blade or UCS Managed C-Series while ESXi is running on blades OR C-Series servers?

This will reboot your server along with OS 

NOTE # perform this action in a planned window , if needed.

[m1xed0s]

So the re-acknowledge action just destroys the existing connection between compute and FI. And then rebuilds?

[AFROJ AHMAD]

yes  , server goes through the discovery process

[m1xed0s]

Thanks! So the hosts would need to be in maintenance mode first...no impact on FIs, right?

[robertdemay · Accepted solution]

Be careful -- This also runs though the policies you have assigned to the profile as part of the discovery process.  If you have a scrub policy assigned that will scrub your disk.  A re-acknowledge will scrub the data off of your disk. 

[m1xed0s]

Thanks! Good Point!

[AFROJ AHMAD]

Yes , do verify what policy you have configured.

https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/2-2/b_UCSM_GUI_Configuration_Guide_2_2/b_UCSM_GUI_Configuration_Guide_2_2_chapter_011110.html#d138862e8852a1635