Methods and structure for supporting persistent reservations...

Details Methods and structure for supporting persistent reservations... Methods and structure for supporting persistent reservations...

2007-12-25

2007-12-25

Chen, Alan S. (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output command process

C710S033000, C710S038000

Reexamination Certificate

active

10868554

ABSTRACT:
A persistent reservation emulation structure to emulate exclusive reservation SCSI-3 protocol features in a host system having multiple paths to a storage device. An enhanced multiple-path driver layer (or other processing elements) provide emulation of persistent reservation commands directed from a host system to a storage device. The driver does not forward exclusive type reservations to the storage device but rather emulates the desired exclusive operations on the systems behalf using only non-exclusive reservation types. The emulated reservation handling enables parallel use of multiple paths between a host system and a storage device to improve reliability and/or performance of the storage device.

REFERENCES:
patent: 6286056 (2001-09-01), Edgar et al.
patent: 2003/0065782 (2003-04-01), Nishanov et al.
patent: 2004/0030822 (2004-02-01), Rajan et al.
patent: 2005/0228924 (2005-10-01), Marushak et al.

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