System and method for dual stage persistent reservation...

Details System and method for dual stage persistent reservation... System and method for dual stage persistent reservation...

2005-12-06

2005-12-06

Perveen, Rehana (Department: 2112)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S240000, C709S226000

Reexamination Certificate

active

06973511

ABSTRACT:
A system and method for a dual stage persistent reservation preemption protocol is presented. A first adapter registers with a shared device and obtains reservation ownership of the shared device. The first adapter sets an internal reservation owner flag to “TRUE” in response to obtaining reservation ownership. The internal flag status is analyzed if the first adapter is de-registered from the shared device. When a second adapter preempts the first adapter to obtain reservation ownership, the first adapter loses its registration with the shared device. The first adapter receives an error message from the shared device in response to a request, and the first adapter checks its internal reservation owner flag status. If the first adapter's internal reservation owner flag status is “TRUE”, the first adapter re-registers with the shared device.

REFERENCES:
patent: 2003/0065782 (2003-04-01), Nishanov et al.
Weber RO et al., “SCSI Primary Commands—3 (SPC-3): Working Draft”, rev. 00, Project T10/1416-D, Jun. 3, 2001, 274+xix pp., pp. 23-37, Jun. 3, 2001.
Lohmeyer J, “Proposal for Persistent Reservation”, rev. 2, X3T10/95-229, http://www.t10.org, 22 pp., Sep. 28, 1995.

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