Data Storage Apparatus and Method of Data Management in the Data Storage Apparatus

A data storage apparatus comprising:

• a first storage tier;
• a second storage tier;
• a server central processing unit (CPU) in communication with the first storage tier and the second storage tier, wherein the server CPU is configured to:
• determine that a memory region (MR) stored in the first storage tier is suitable for hibernation;
• execute a tier-down operation to move the MR to the second storage tier;
• receive, from a client, a client remote procedure call (RPC);
• and
• provide a requested memory access to the client in response to receiving the client RPC;
• and
• a server remote direct memory access (RDMA) network interface card (RNIC) in communication with the server CPU, wherein the server RNIC is configured to send, in response to an RDMA request to the MR from the client, a notification response to the client to notify the client of a hibernated status of the MR.