Oracle International Corporation

Kishy Kumar

Kothanda Umamageswaran

Ajit Mylavarapu

Akshay Shah

Silvio Martinez

Ajay Paddayuru Shreepathi

Guttu Sai Abhishek

Disclosed is an improved approach to handle recovery failures associated with fatal recovery processes. A software crash is prevented when a program has a failure that would typically crash the software, involving analyzing the failure in an operation, accumulating the failure information, clearing the failure (hence preventing the immediate crash), and not performing the desired operation until the root cause of the failure is fixed.

System and method of providing system availability by preventing software crash due to recovery failure

The techniques described herein limit client utilization of a parallel-access storage device. Specifically, client utilization of a particular storage device is estimated using I/O cost metrics to estimate the costs of I/O requests from the client to the particular storage device. The I/O cost metrics are determined based on calibration-based system performance data, which represents a system-wide measure of storage device performance for a system in which the particular storage device resides. The calibration-based system performance data includes one or both of composite throughput data and composite IOPS data for multiple parallel-access devices in the system. The cost estimates for I/O requests issued from a client to a parallel-access device are tracked in a total cost estimate for the client. Client utilization of the storage device, as tracked by the total cost estimate for the client, is limited to a percentage of the total estimated bandwidth of the storage device.

Consistently enforcing I/O resource constraints for workloads on parallel-access storage devices

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Redwood City, CA, United States of America

Kishy Kumar