Cluster shared volumes

Details Cluster shared volumes Cluster shared volumes

2008-06-27

2010-11-23

Tseng, Cheng-Yuan (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

C709S226000

Reexamination Certificate

active

07840730

ABSTRACT:
Described is a technology by which a storage volume is shared by cluster nodes of a server cluster. In one implementation, each node includes a redirector that provides shared access to the volume from that node. The redirector routes file system metadata requests from applications and the like through a first (e.g., SMB) communications path to the owning node, and routes file system read and write data to the storage device through a second, high-speed communications path such as direct direct block level I/O. An owning node maintains ownership of the storage device through a persistent reservation mechanism that writes a key to a registration table associated with the storage device. Non-owning nodes write a shared key. The owning node validates the shared keys against cluster membership data, and preempts (e.g., removes) any key deemed not valid. Security mechanisms for controlling access are also described.

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