Patent application number | Description | Published |
20090037662 | Method for Selectively Enabling and Disabling Read Caching in a Storage Subsystem - A mechanism for selectively disabling and enabling read caching based on past performance of the cache and current read/write requests. The system improves overall performance by using an autonomic algorithm to disable read caching for regions of backend disk storage (i.e., the backstore) that have had historically low cache hit ratios. The result is that more cache becomes available for workloads with larger hit ratios, and less time and machine cycles are spent searching the cache for data that is unlikely to be there. | 02-05-2009 |
20090049458 | INTERFACE FOR APPLICATION COMPONENTS - Provided are a system and article of manufacture, wherein a first application and a second application are executed in a first process space in a node, wherein a third application is capable of executing in a second process space. A common interface to the first, the second, and the third applications are provided by a remote proxy class. The third application is executed in the first process space by securing a plurality of attributes for the third application from the common interface. | 02-19-2009 |
20090064159 | SYSTEM AND METHOD FOR OPTIMIZING LOAD DISTRIBUTION ACROSS LOGICAL AND PHYSICAL RESOURCES IN A STORAGE SYSTEM - An apparatus, system and method to optimize load distribution across logical and physical resources in a storage system. An apparatus in accordance with the invention may include an availability module and an allocation module. The availability module may dynamically assign values to resources in a hierarchical tree structure. Each value may correspond to an availability parameter such as allocated volumes, current resource utilization, and historic resource utilization. The allocation module may serially process the values and allocate a load to a least busy resource in the hierarchical tree structure based on the assigned values. | 03-05-2009 |
20100030956 | APPARATUS AND METHOD TO STORE ORIGINAL POINT-IN-TIME DATA - A method to store point-in-time data, comprising establishing a block size, providing source data storage comprising (S) blocks, and target data storage comprising (T) blocks. The method configures (B) source storage segments and (B) target storage segments, and receives updated point-in-time data for original point-in-time data written to an (i)th source storage segment. The method then determines if a (j)th target storage segment comprises available storage capacity to store the original point-in-time data. If a (j)th target storage segment comprises available storage capacity to store the original point-in-time data, the method writes the original point-in-time data to that (j)th target storage segment. | 02-04-2010 |
20100049920 | DYNAMICALLY ADJUSTING WRITE CACHE SIZE - A storage system includes a backend storage unit for storing electronic information; a controller unit for controlling reading and writing to the backend storage unit; and at least one of a cache and a non-volatile storage for storing the electronic information during at least one of the reading and the writing; the controller unit executing machine readable and machine executable instructions including instructions for: testing if a frequency of non-volatile storage full condition has occurred one of above and below an upper threshold frequency value and a lower threshold frequency value; if the frequency of the condition has exceeded a threshold frequency value, then calculating a new size; calculating an expected average response time for the new size; comparing actual response time to the expected response time; and one of adjusting and not adjusting a size of the non-volatile storage to minimize the response time. | 02-25-2010 |
20100049925 | EXECUTING HOST DATA TRANSFER OPERATIONS DURING SETUP OF COPY SERVICES OPERATIONS - Host input/output (I/O) operations are performed via a file stored in a non-volatile storage coupled to a storage controller while data structures are being generated in the storage controller to copy data from source logical volumes to target logical volumes. The source logical volumes and the target logical volumes are logical representations of physical storage maintained in a plurality of direct access storage devices. The contents of the file are transferred from the non-volatile storage to one or more of the plurality of direct access storage devices, after the data structures have been generated, wherein the host I/O operations are performed via the file while the contents of the file are being transferred to the one or more of the plurality of direct access storage devices. The host I/O operations to the plurality of direct access storage devices are resumed, in response to transferring entire contents of the file to the one or more of the plurality of direct access storage devices. | 02-25-2010 |
20100199050 | PROACTIVE TECHNIQUE FOR REDUCING OCCURRENCE OF LONG WRITE SERVICE TIME FOR A STORAGE DEVICE WITH A WRITE CACHE - Provided are techniques for introducing a delay in responding to host write requests. A percentage of fullness of a write cache is determined. Based on the determined percentage of fullness of the write cache (f), a low cache threshold (L), alpha (α), and k, an amount of delay to introduce into responding to a host write request is determined. Techniques wait the amount of the delay before responding to the host write request although the host write request processing has completed. | 08-05-2010 |
20130268716 | EXECUTING HOST DATA TRANSFER OPERATIONS DURING SETUP OF COPY SERVICES OPERATIONS - Host input/output (I/O) operations are performed via a file stored in a non-volatile storage coupled to a storage controller while data structures are being generated in the storage controller to copy data from source logical volumes to target logical volumes. The source logical volumes and the target logical volumes are logical representations of physical storage maintained in a plurality of direct access storage devices. The contents of the file are transferred from the non-volatile storage to one or more of the plurality of direct access storage devices, after the data structures have been generated, wherein the host I/O operations are performed via the file while the contents of the file are being transferred to the one or more of the plurality of direct access storage devices. The host I/O operations to the plurality of direct access storage devices are resumed, in response to transferring entire contents of the file to the one or more of the plurality of direct access storage devices. | 10-10-2013 |
20150046668 | INPUT/OUTPUT OPERATION MANAGEMENT IN A DEVICE MIRROR RELATIONSHIP - In a network computing environment, in which data stored at a primary storage system, is mirrored from the primary storage system to a secondary storage system, a selection may be made to direct an input/output operation such as a read operation, for example, to the secondary storage system instead of the primary storage system in order to improve operations. For example, a read operation may be directed to the secondary storage to improve the read operation response time. In other aspects, a read or other input/output operation may be directed to the secondary storage to improve utilization of the resources of the secondary storage system. Other aspects are described. | 02-12-2015 |