International Business Machines Corporation

Sangeeth Keeriyadath

Pruthvi Panyam Nataraj

Nitin Kumar

Sanket Rathi

Mallesh K Lepakshaiah

An approach for virtual machine (VM) random access memory (RAM) disk preservation during VM failure. A RAM disk manager receives a VM identifier and attributes for connecting a RAM disk to the VM, where the RAM disk includes a memory region separate from memory region(s) associated with the VM. The RAM disk manager creates a RAM disk VM driver for interfacing the RAM disk between a disk driver and virtual drive adapter. The RAM disk manager detects an output action based on the disk driver operation and responds to detecting an output action by storing output data to the RAM disk and marking synchronization status as pending. The RAM disk manager synchronizes the output data, asynchronously with non-volatile storage and detects a failed VM, responding by disconnecting the RAM disk and can re-assign the RAM disk to a next VM.

Memory resident storage recovery during computer system failure

According to one exemplary embodiment, a method for VIOS failover in an environment with a physical storage adapter is provided. The method may include assigning the physical storage adapter to a first VIOS, wherein the physical storage adapter has I/O connectivity to at least one storage device. The method may include configuring a first I/O path between the first VIOS and a second VIOS. The method may include configuring a second I/O path from a client partition to the first VIOS, wherein the second I/O path is set as a primary I/O path. The method may include configuring a third I/O path from the client partition to the second VIOS. The method may include determining the first VIOS is inaccessible. The method may include unassigning the physical storage adapter from the first VIOS. The method may include assigning the physical storage adapter to the second VIOS.

Managing VIOS failover in a single storage adapter environment

Dynamically sharing information among a plurality of adapters in a multipath input/output (MPIO) system, selecting one of the adapters to receive an input/output request based on the shared information, and sending the input/output request to that adapter.

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Kozhikode, India

Sangeeth Keeriyadath