Paul M Remley

Author:

Paul G. Remley

ISBN #:

0521032806

US Patent:

7287134, Oct 23, 2007

Filed:

May 15, 2007

Appl. No.:

11/803916

Inventors:

Wayne Eugene Miller - Livermore CA, US
Yuri Vladimirovich Bagashev - Cupertino CA, US
David Alan Burton - Vail AZ, US
Noel Simen Otterness - Lafayette CO, US
Paul Michael Remley - Livermore CA, US

Assignee:

Pillar Data Systems, Inc. - San Jose CA

International Classification:

G06F 13/00

US Classification:

711158, 711 4, 711111, 711112, 711114, 711151, 710 40, 710244

Abstract:

The invention relates to management of I/O in data storage systems. In an embodiment, the invention provides a data storage subsystem processing I/O requests each having a priority, comprising a processor, a memory coupled to the processor, a disk array, an array controller coupled to the processor and the disk array, a network interface, coupled to the processor, to receive an I/O request with a priority, and a program in the memory for managing the I/O request based on the priority, a clip level of the priority, the total workload in the data storage subsystem, and processing I/O requests based on priority, workload clip levels, and fairness levels. The invention also contemplates the use of static and dynamic adjusted clip levels. The invention also relates to a method of managing I/O requests, comprising receiving an I/O request, determining the priority of the I/O request, comparing the total workload to the clip level for the priority, and processing the I/O request if the total workload is below the clip level or the priority workload is below a fairness level.

US Patent:

20060095686, May 4, 2006

Filed:

Oct 29, 2004

Appl. No.:

10/976430

Inventors:

Wayne Miller - Livermore CA, US
Yuri Bagashev - Cupertino CA, US
David Burton - Vail AZ, US
Noel Otterness - Lafayette CO, US
Paul Remley - Livermore CA, US

International Classification:

G06F 13/00

US Classification:

711151000

Abstract:

The invention relates to management of I/O in data storage systems. In an embodiment, the invention provides a data storage subsystem processing I/O requests each having a priority, comprising a processor, a memory coupled to the processor, a disk array, an array controller coupled to the processor and the disk array, a network interface, coupled to the processor, to receive an I/O request with a priority, and a program in the memory for managing the I/O request based on the priority, a clip level of the priority, the total workload in the data storage subystem, and processing I/O requests based on priority, workload clip levels, and fairness levels. The invention also contemplates the use of static and dynamic adjusted clip levels. The invention also relates to a method of managing I/O requests, comprising receiving an I/O request, determining the priority of the I/O request, comparing the total workload to the clip level for the priority, and processing the I/O request if the total workload is below the clip level or the priority workload is below a fairness level.