Bogdan_GRC   You will need to contact support in order to reset the password.  Also, you will need to setup a maintenance window as the controller needs to be rebooted following password reset procedure.  You will also need the cable that came with your ME4024 so that you can connect to the serial port on the controller.   As far as your question, the reset process doesn't effect the config or data.    Let me know if this helps.    
Hi everybody, We've purchased a ME4024 system last year. We did the configuration for it, added it to cluster, did a bunch of testing, and went into production with it. A few months down the line, we simply couldn't login to it anymore. It would just say unable to authenticate, please try again. The CLI login would do the same. It's been running just fine, no issues, email notifications also work fine, everything seems to be working fine except the inability to login to it. Last time we logged in successfully we couldn't login to 1 controller, so we went to the other one. The first 2 attempts on the second controller failed, but the third one worked and we got it. Looked at the logs, etc, all good. Next time we tried to login we couldn't login to any controller and we haven't been able to login to Power Vault Manager since. Everybody is saying that we forgot the username and password, but I'm 99.9% sure we didn't, as we did the initial config, weeks of testing, and production launch using these credentials. We are running G280 firmware, so password resets have to be done by Dell. I would like to know if the "password reset" procedure that dell will perform also erases the disk groups, volumes, data, host mappings, etc. In other words, if we lose the storage configuration and the data. We know the controllers will reboot, and cluster has to be turned off, but we are asking if the configuration and data will still be there after the "reset password" procedure, and the cluster will be able to operate normally post-procedure.   Thank you to all!
ME4024 password reset