Hi Goran - I wrote a little client application and was able to duplicate the problem. While studying the root cause I discovered that OpenPegasus does not support batch requests. Unfortunately, OpenPegasus is the only CIMOM we certify and deliver with the provider.
The provider maintains an in-memory cache of storage system objects so it can promptly return data to client applications. Are serial calls to the provider not adequate? Or is it a matter of the existing client application that is designed to use batch operations?
You were right, it was matter of existing client application, but now I change business logic to work with CIMClient instead of BatchCIMClient, and it's working well, because in test environment I have one Storage, but will see in bigger environment how fast will be this serial communication.
Thank you for answer and this information about OpenPegasus and NetApp Agent.