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Alexandre TakacsFlag for Switzerland asked on

Duplicate UUID at ESX boot

I am maintaining an ESX server that is booted from a (high end) USB key.

Everything works fine but as a safety measure we are keeping a clone of the key as a backup in case something would go wrong.

Unfortunately ESX doesn’t seem happy in seeing two volumes with the same UUID:

https://www.teimouri.net/resolve-two-filesystems-uuid-detected/

I have used the “overrideDuplicateImageDetection” boot time trick and things seem stable as is but not sure it is a long term viable solution.

I would like, as much as possible, to keep my backup usb image. As the machine is in a data center I’d really like to be able to keep that disk available.

Amy idea / opinions ?

VMwareVirtualization

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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

8/22/2022 - Mon
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

I'm afraid that's by design.

As a long term viable solution ESXi from 7.0U3 no longer supports the use of SD or USB flash drive, they are depreceated.

So I would look at installing ESXi on a NVMe, SSD, HDD, SATADOM etc

You can always backup the ESXi configuration for restore later.
ASKER
Alexandre Takacs

You can always backup the ESXi configuration for restore later.  
Sure - but it is definitely more tedious and requires to have the exact same build etc...
Is a usb3 attached SSD drive a supported config ?
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

Is a usb3 attached SSD drive a supported config ?

No.

If you are currently concerned about the USB installation, the change it now. It's no longer a supported configuration by VMware and now deprecated from 7.0U3, since changes in ESXi 7.0U2 causes them all to fail, SD and USB flash drive, a later patch may fix this....

but

gone are the days now when you can use an SD card or USB flash drive for installation.

What are you trying to prevent, if you re-install to NVMe, SATADOM, SSD, HDD ?

We've not had any ESXi installations fail on SD/USB flash drive since 2004, until 7.0U2 was released!
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ASKER
Alexandre Takacs

We've not had any ESXi installations fail on SD/USB flash drive since 2004, until 7.0U2 was released!
I guess you are making my point !
The matter is really ease of use and isolation from "main" internal storage.
But I note this is not anymore a good pratice :(
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

If you are concerned about internal storage failure, use mirrored supported hardware solution to reduce single point of failure, regularly scheduled backups of configuration.

I think that would then cover you, of a failed ESXi installation.

Do not share the same datastore as the ESXi installation, e.g. datastore1 on a separate set of disks to the ESXi install. This helps with recovery.

Internal storage is NOW the way forward, despite many complaints to VMware !
ASKER
Alexandre Takacs

Thanks for the feedback - will plan accordingly.
Just out of left field - is NetBooting a supported approach ?
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

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ASKER
Alexandre Takacs

Ok :)

Looking forward to your EE article on thee matter !
ASKER
Alexandre Takacs

Sorry to continue posting here but just to double check this (USB not supported) is a 7.x issue. 6.7.x is not affected ?
We have bunch of those which are working fine and don't need any 7 features (and denitely not the new bugs) so no need to worry there ?
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

Unfortunately, the same issues have been found with 6.7, and VMware have not provided a fix for 6.7.

They've not stated that is not supported for 6.7, but if you have a risk that your ESXi installation may become corrupted because of using SD/USB flash drives, not sure how they'll handle that if you raise a support request!

It's not fixable, and if your ESXi installation becomes corrupted it's re-install anyway!

To be honest with you the tide is turning, and any installations on SD/USB flash drive of ESXi are prone now to failure.

1. Backup ESXi configuration regularly, so you can easily re-install and restore.

2. Consider moving to SSD, HDD, NVMe, SATADOM, M.2 as soon as possible.

You can provide work arounds, like moving logs onto persistent storage etc but we've been installing onto USB and SD cards since 2004....

and now we are being told to install on local devices and disks in servers, which have no space for internal disks! which are on the HCL, and were purchased with 3-5 year lifetime for ESXi, and now that's not possible! oer supported!

and recent server purchases as of 2021, which are no longer supported, requiring massive change of configurations!

Yes, it's a mess!!!
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