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Posted February 11th, 2026 13:34
Hi,
One controller is stuck in Safe Mode because it cannot complete the startup. Please run the following command from the Safe Mode console:
sub showThis will reveal which subsystem is preventing the controller from booting.
Please send us the output so we can advise the next steps (Recovery Boot or force‑update).
Thank you,
MarcoDELL- Marco B
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Dell Technologies | Enterprise Support Services
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Posted February 12th, 2026 04:52
после запуска sub show0
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Posted February 12th, 2026 13:50
Hi,
Thank you for the screenshot. All subsystems show “Not Attempted”, which means the controller never starts the OS load process. This normally indicates a corrupted OS image or a version mismatch with the other controller.
Next step: please reboot the controller and enter the Safe Mode menu, then select:
Menu → Recover / Install OS image from peer controller
If the recovery fails, we will need to perform a force‑update from Safe Mode.
Please let me know the result.
Thank you,
MarcoDELL- Marco B
Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
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Posted February 12th, 2026 14:11
Инструкция по шаговой есть как востановить или установить ос с другой контроллера
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Posted February 12th, 2026 14:21
Возможно запустить на одном контроллер или нет
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Posted February 12th, 2026 15:06
Hi,
Yes — it is possible to run the OS restore on only one controller. In Safe Mode, you can use:
Menu → Recover / Install OS Image from Peer Controller
This will reinstall the OS on the problematic controller using the healthy controller as the source.
Please note: it is much better to write in English on the Dell Community, as English is the official support language and will help you receive faster and more accurate assistance.
Let me know how it goes.DELL- Marco B
Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
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Posted February 12th, 2026 15:12
I have a second controller, and when I connect it via the COM port, nothing happens. It's as if the rear LEDs are faulty; they don't light up. Maybe I should download an image somewhere to reinstall it?
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Posted February 12th, 2026 15:14
I have a Dell SCV3020. Is it possible to make a backup image from it and load it onto the faulty one? Can you provide instructions on how to do this?
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Posted February 12th, 2026 15:44
If the second controller shows no output on the COM port and the rear LEDs do not light up, this usually means the controller is not powering on at all. In this condition it is impossible to access Safe Mode or install an OS image.
Regarding your question: It is not possible to create a backup OS image from one controller and install it manually on the faulty one.
The SCv3020 OS can only be restored using the built‑in Safe Mode recovery, and this requires the controller to be at least partially functional.
To recover the controller, i t must allow the option “Recover / Install OS Image from Peer Controller” If the controller does not even start (no LEDs, no serial output), this indicates a hardware failure, and the unit will need replacement.
Regards
DELL- Marco B
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Dell Technologies | Enterprise Support Services
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DELL-Charles R
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Posted March 17th, 2026 19:37
Hello,
About the HSN vs SSN Mismatch Error
The error you mentioned:
“Controller HSN xxxxxx does not match Backplane SSN xxxxxx”
This occurs when:
This is a Dell‑service‑only repair operation.
It can only be corrected using Dell’s internal manufacturing tools.
Users cannot clear or reprogram an HSN/SSN mismatch.
For a Dell Partner you may try this link to find some in Kazakhstan
In the Location field try Kazakhstan
https://dell.my.site.com/FindAPartner/s/partnersearch?language=en_US&country=KZ&partnerType=findareseller
DELL-Charles R
Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
#IWork4Dell
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