摘要:
Provided are a method, system, and program for establishing a point-in-time copy. Input/Output (I/O) requests to tracks identified as source tracks and corresponding target tracks in a point-in-time copy relationship are suspended until the point-in-time copy relationship is established. At least one data structure providing information on the source tracks and corresponding target tracks in the point-in-time copy relationship is generated, wherein the point-in-time copy relationship is established before data at the source tracks is copied to the target tracks and before source tracks in cache at the point-in-time are destaged to storage.
摘要:
Provided are a method, system, and program for destaging a track from cache to a storage device. The destaged track is retained in the cache. Verification is made of whether the storage device successfully completed writing data. Indication is made of destaged tracks eligible for removal from the cache that were destaged before the storage device is verified in response to verifying that the storage device is successfully completing the writing of data.
摘要:
Provided are a method, system, and program for destaging a track from cache to a storage device. The destaged track is retained in the cache. Verification is made of whether the storage device successfully completed writing data. Indication is made of destaged tracks eligible for removal from the cache that were destaged before the storage device is verified in response to verifying that the storage device is successfully completing the writing of data.
摘要:
An apparatus and system are disclosed for adjusting trace data granularity. An initialization module sets a base granularity for trace data recorded for a component. A registration module registers a condition counter comprising a condition set. The threshold module sets a count threshold for the condition counter. An increment module counts each instance of the condition set. An adjustment module adjusts the granularity of trace data stored for the component to a modified granularity if the condition count exceeds the count threshold. In one embodiment, a timer module times an adjusted trace data granularity time interval. The adjustment module may set the granularity of the trace data to the base granularity when the adjusted trace data granularity time interval exceeds a specified time interval.
摘要:
Provided are a method, system, and program for destaging a track from cache to a storage device. The destaged track is retained in the cache. Verification is made of whether the storage device successfully completed writing data. Indication is made of destaged tracks eligible for removal from the cache that were destaged before the storage device is verified in response to verifying that the storage device is successfully completing the writing of data.
摘要:
Provided are a method, system, and article of manufacture for managing write requests in cache directed to different storage groups. A determination is made of a high and low thresholds for a plurality of storage groups configured in a storage, wherein the high and low thresholds for one storage group indicate a high and low percentage of a cache that may be used to store write requests to the storage group. A determination is made of a number of tasks to assign to the storage groups based on the determined high and low thresholds for the storage groups, wherein each task assigned to one storage group destages write requests from the cache to the storage group.
摘要:
In a cache management system multiple cache lists are utilized, where each entry in a list names at least one corresponding data item in cache. A cache manager always demotes cache list entries from a “current removal list” (and demotes or destages the corresponding data items from cache) until that list is exhausted and another list rotates into the function of current removal list. A prescribed order is established for rotating the role of current removal list. In response to prescribed activities of data items in cache, new cache list entries are added nearer or farther from the current removal list according to the prescribed order and the data items' priorities.
摘要:
Disclosed is a method, system, and program for processing data access requests, such as read requests, to a storage location maintained in both a first storage, such as a cache, area and second storage area, such as a disk drive, during a destage operation. A destage operation is granted access to the storage location to destage data from the storage location in the first storage area to the second storage area. During the destage operation, a data access request is granted access to the storage location.
摘要:
Provided are a method, system, and article of manufacture for using different algorithms to destage different types of data from cache. A first destaging algorithm is used to destage a first type of data to a storage for a first duration. A second destaging algorithm is used to destage a second type of data to the storage for a second duration.
摘要:
Provided are a method, system, and article of manufacture for using different algorithms to destage different types of data from cache. A first destaging algorithm is used to destage a first type of data to a storage for a first duration. A second destaging algorithm is used to destage a second type of data to the storage for a second duration.