no such thing,  contact support if you need assistance. Service processor is for authorized EMC personnel/service provider.

I need DMX password too.

same as above, contact EMC support for assistance.

Password for what??

Password for what? Hardware (SP)?  Or for accessing DMX (SMC /ECC)?

There is no default password for DMX-3/4 hardware if that's what you are asking. EMC will need to be contacted for any relevant queries.

SMC default password is smc/smc.

SLC CREDENTIAL 

Some say that previous EMC founded ENG engineers leave company, can provide the CREDENTIAL

Why do we buy equipment, but don't let us access to use?

I agree with akc5247 as he answer  this reply.To access  DMX through SMC .I would like to add little bit more .and for ecc user name and password is eccadmin..If you want to login symwin there are few access level to assess but for this you must should have knowledge CE(customer engineer) .and for credential if you have  powerlink access  you may generate from it.but every body don't have for this .

Why do you need the service processor password?
Its for EMC engineers to troubleshoot the issues. You can access your storage using various tools for provisioning and monitoring such as SMC, ECC (EOL now), unisphere, etc.,

If you need login to service processor please call SLC help desk.

"Why do we buy equipment, but don't let us access to use?"

You have to be bit more clear in this. If you are talking about SymmWin access, even if EMC wanted to, they cannot give it to you - since they have to re-generate password every hour or so (or maybe more) based on what the task they need to perform on the box.

If the box is on ESRS, then EMC can locate credentials for you. So, back to square one - if you are going to work on the box - which looks like it is - contact EMC support.

We in this forum are here to help you get close to the answer as possible, but without understanding what you are looking for, we are all shooting blind.