International Business Machines Corporation

Ao Wan

Ann Corrao

Ronen Grosman

Carlos D Cavanna

Hamdi Roumani

Robert Francis

Tiia J Salo

Muhammad Sohaib Aslam

A request for changing data of a file system data structure stored on a shingled magnetic recording (SMR) drive is received. The data change is logged in a log entry of a log structure stored in a non-volatile random access memory (NVRAM). The log entry is added as a new entry at an end of the log structure. The log entry is marked within the NVRAM as modified and a predetermined criterion is determined to be satisfied. Responsive to determining that the predetermined criterion is satisfied, the NVRAM is searched for log entries marked as modified. The modified log entries are stored to the SMR drive.

Shingled magnetic recording drive mapping using nonvolatile random access memory for persistent updates

Shingled magnetic recording drive mapping using non-volatile random access memory for persistent updates

An infrastructure for servicing remote direct memory access (RDMA) requests without the need to pin memory and/or register memory for access by only a single RDMA adapter. Rather, RDMA requests can be coherently serviced from memory accessible to multiple adapters, and that memory can be flexibly managed (such as by swapping it out of main memory or moving it around within main memory). This coherent servicing of RDMA requests is achieved through the use of a coherent attached bus connecting the RDMA adapters to main memory that owns the address space.

High-performance key-value store using a coherent attached bus

According to one exemplary embodiment, a method for remote direct memory access failover is provided. The method may include determining an RDMA operation will be performed. The method may include determining an available node. The method may include sending a data element to the available node based on the RDMA operation being an insert. The method may include receiving a pointer in response to sending the insert, whereby the pointer corresponds to a memory range. The method may include storing the pointer. The method may include retrieving the pointer based on the RDMA operation being an update, a read, or a delete. The method may include sending the pointer, the data element to the available node based on the RDMA operation being an update. The method may include sending the pointer and the RDMA operation to the available node based on the RDMA operation being a read or a delete.

Remote direct memory access for high availability nodes using a coherent accelerator processor interface

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