Patent · US Active

I/O write request handling in a storage system

US9342460B2 · kind B2 · utility

1Cited by

4References

15Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Michael Diederich · Mainz, DE
Erik Rueger · Mainz, DE
Rainer Wolafka · Bad Soden, DE

Key dates

Filing date	Dec 18, 2013
Grant date	May 17, 2016
Priority date	—
Expiry date	Sep 11, 2034

Classification

Technology area (CPC G)Physics
CPC primaryG06F13/385
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

An I/O write request handling mechanism in a storage system comprising at least one normal storage device and at least one cache device is provided. For each received I/O write request, two parallel threads are created. A first thread attempts to execute the write operation using the at least one normal storage device without using the at least one cache device. A second thread monitors the first thread and is triggered to execute the write operation using the at least on cache device if the first thread has not finished the write operation within a given time threshold. In either case, an I/O write completion response is provided to the external device in order to avoid timing out of the write operation. The at least one cache device is freed from data written by the second thread if the first thread completes the write operation after the given time threshold.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.