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November 28th, 2023 04:56

MD3860F Cache Backup Device Failed , Insufficient Cache Backup Device Capacity

Hello

I have read the discussion about 3820F

try to reseat controller and cache and it's still not working

The main difference is that we have a full 3860F as replacement parts

controller are all at same latest firmware version

I would like to know how to change  the controller

is there any special software preparation before ?

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Thanks in advance

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November 30th, 2023 12:52

feed back successfull operation

to remove the message without restarting the full MD

Cache Backup Device Failed, Unable to retrieve detailed information

we put all disks pools  on the replacement controller 1

then reset controller 0

after  all is OK

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2.1K Posts

November 28th, 2023 09:25

Hello, sorry to hear that you are struggling the issue. 

you can replace a RAID controller module or an expansion module by following these steps: 

please check pg 33 Dell PowerVault MD3860f Storage Arrays Owner's Manual

  • Remove the failed RAID controller module or expansion module from the storage array.
  • Install the new RAID controller module or expansion module in the storage array.
  • Open the RAID controller module and connect the cables.
  • Verify that the RAID controller module or expansion module is functioning properly.

(edited)

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November 30th, 2023 11:32

Thanks for the information

So we have made the operation this morning

switching disks pools to operational controller 0

have to put the incrimined controller 1 offline

removing the controller 1

waiting 1 minute at least

putting the replacement controller in the rack

place the controller 1 online

controller 1 is seen ok by the MD3860 ( cache is active )

But there still is a message in the Recovery Guru section with the  "Cache Backup Device Failed, Unable to retrieve detailed information"

we put all disks pools  on the replacement controller 1

then reset controller 0

and now all is optimal

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2.1K Posts

30-11-2023 12:18 PM

Hi, “Cache Backup Device Failed, Unable to retrieve detailed information” message in the Recovery Guru section might be a residual error message from the previous controller failure. I beleive since you’ve replaced the controller and all is now optimal, this message might not reflect the current state of your hardware. It could be beneficial to clear the system logs and restart the system to see if the message persists.

DELL-Erman O

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Dell Technologies | Enterprise Support Services

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November 30th, 2023 12:24

@Dell-ErmanO​ 

I think you forget to read the 3 last lines that explain how we remove the message 

we put all disks pools  on the replacement controller 1

then reset controller 0

and now all is optimal

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