METHODS TO IDENTIFY, HANDLE AND RECOVER FROM SUSPECT SSDS IN A CLUSTERED FLASH ARRAY

摘要

A technique predicts failure of one or more storage devices of a storage array serviced by a storage system and for establishes one or more threshold conditions for replacing the storage devices. The predictive technique periodically monitors soft and hard failures of the storage devices (e.g., from Self-Monitoring, Analysis and Reporting Technology), as well as various usage counters pertaining to input/output (I/O) workloads and response times of the storage devices. A heuristic procedure may be performed that combines the monitored results to calculate the predicted failure and recommend replacement of the storage devices, using one or more thresholds based on current usage and failure patterns of the storage devices. In addition, one or more policies may be provided for replacing the storage devices in a cost-effective manner that ensures non-disruptive operation and/or replacement of the SSDs, while obviating a potential catastrophic scenario based on the usage and failure patterns of the storage devices.

主权项

1. A method comprising:
receiving a write request having data directed towards a storage container stored on a plurality of storage devices included in a storage array connected to a node; issuing an input/output (I/O) storage operation to store the data to a first storage device of the storage array; in response to an I/O error detected from the I/O storage operation, incrementing a first counter in a memory included in the node, wherein the first counter is associated with a first I/O error type; and in response to the first counter exceeding a first predetermined threshold after a first periodic interval, issuing an alert to migrate the data from the first storage device to a second storage device of the storage array, and placing the first storage device into read-only service.