vSphere ESXi upgrade is really slow (About to install…)

During the past hours we upgraded our HPE blades from ESXi 6.0.0 U1 to 6.0.0 U2. During the process (using the vSphere Update Manager), the ESXi seems to be frozen on the step “About to install…”.


After 30 minutes we restarted all blades with this message thinking they were crashed/stuck… It’s been an error. The process wasn’t stuck, but only really really really slow. Perhaps it was specific to this version or to the HPE custom ISO, I don’t remember this problem before.

So if you’re see the same problem you can solve it by being patient… simply. The install will end after 35/40 minutes. I wrote this post because I noticed on other blogs than the process wasn’t working and you need to install manually the upgrade. In our case, it was wrong, just being patient.

14 thoughts on “vSphere ESXi upgrade is really slow (About to install…)

  1. Hey
    Same problem here on my HP Blade center 460 G9
    after 45 min my setup has finished, it is HP bug

  2. Hey! Thanks for your blog post, was really helpful… in the same situation upgrading some DL580s from 5.5 to 6.0U2 Didn’t think it would be this slow but appreciate the heads up

  3. Hi there!
    Doing a ESXi 6 install on a brand new HPE ML110 G9 and the same thing happened. I will wait a bit. If it works I will come back here to tell the end of this story 🙁

  4. I came across this site because I had a similar issue on a Cisco UCS rackmount server (upgrade from ESXi 6.0 to 6.5 via Update Manager, and the whole process got stuck on “About to install” for a long time).

    After about 15-20 minutes, it has (finally!) moved on.

    So it seems to be less about server vendors, and more about vSphere being extremely slow to upgrade 🙂

  5. To top it off.. a tail from a home user.

    On Intel NUC NUC5i7RYH – Core i7, running ESXi 6.0, upgrade to 6.5, takes around 35-40 minutes, and then it’s only to tell me, that the image profile can’t be found.

    Yay ESXi upgrades! 🙂

  6. It’s been 24 hours for me, and still stuck at “About to Install”. I don’t think patience is going to help me here…

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