Update Firmware of multiple ESXi Hosts at once with OMEVV

Question

Hi,  is it possible to update Firmware of multiple ESXi Hosts at once with OMEVV? I enabled parallel Remediation inside the Lifecycle Manager. If I start the remediation of multiple Hosts, only one Host passes the Pre Checks. The other Hosts are failing until the first Hosts reboots, then one other Host isn't failing anymore. Is that the expected behavior? The error messages are: UPDATE_PRE_CHECK' for host FAILED' on HSM: Dell OMEVV Plugin Kind regards

DELL-Marco B · Accepted Answer

Yes, this is expected behavior. OMEVV always follows its own workflow to check and manage the host state during firmware updates. Even if the hosts are already in maintenance mode, OMEVV will still perform its checks and steps to ensure the process is consistent.

DELL-Charles R · Answer

Hello,

Yes, what you are seeing is expected behavior with Dell OpenManage Enterprise Virtualization (OMEVV) when updating ESXi hosts.

Why Only One Host Passes Pre-Check

Even if parallel remediation is enabled in vSphere Lifecycle Manager, OMEVV still respects cluster-level DRS and HA constraints.
VMware requires that only one host at a time enters maintenance mode if:

Admission control is active
There are insufficient resources to evacuate VMs from multiple hosts simultaneously

So, OMEVV will queue other hosts until the first completes reboot and exits maintenance mode.

Error: UPDATE_PRE_CHECK FAILED

This occurs because:

The host cannot enter maintenance mode while another host is already in maintenance mode.
Pre-check fails until resources are freed.

Ede Vau · Answer

@DELL-Charles R​  Sorry, I forgot to mention that all affected Hosts were put manually into maintenance mode before starting the remediation.  Is it still expected behavior?

Dell OpenManage Enterprise

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