International Business Machines Corporation

Scott D Guthridge

Leah Shalev

David Jones Craft

Shmuel Ben-Yehuda

Julian Satran

James Christopher Wyllie

Zorik Machulsky

James Xenidis

Orran Yaakov Krieger

Ilan Shimony

Ralph Attila Becker-Szendy

A method for performing stripe placement within a storage system is disclosed. After a set of failure domains within a storage system has been identified, the failure domains are then organized to form a hierarchy of failure domains. A failure domain is defined as a group of one or more disks that are more likely to fail together because a common component is shared by that group of disks. Stripe placement is performed across all active failure domains within the storage system using a greedy algorithm.

Failure domain based storage system data stripe layout

A method and system for memory address translation and pinning are provided. The method includes attaching a memory address space identifier to a direct memory access (DMA) request, the DMA request is sent by a consumer and using a virtual address in a given address space. The method further includes looking up for the memory address space identifier to find a translation of the virtual address in the given address space used in the DMA request to a physical page frame. Provided that the physical page frame is found, pinning the physical page frame al song as the DMA request is in progress to prevent an unmapping operation of said virtual address in said given address space, and completing the DMA request, wherein the steps of attaching, looking up and pinning are centrally controlled by a host gateway.

Method and system for memory address translation and pinning

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San Jose, CA, United States of America

Scott D Guthridge