| Patent application number | Description | Published |
|---|
| 20080235449 | REBALANCING OF STRIPED DISK DATA - Provided are a method, system, and article of manufacture, where a plurality of extents are stored in a first set of storage units coupled to a controller. A determination is made that a second set of storage units has been coupled to the controller. The plurality of extents are distributed among all storage units included in the first set of storage units and the second set of storage units. | 09-25-2008 |
| 20080244178 | REBALANCING OF STRIPED DISK DATA - Provided are a method, system, and article of manufacture, where a plurality of extents are stored in a first set of storage units coupled to a controller. A determination is made that a second set of storage units has been coupled to the controller. The plurality of extents are distributed among all storage units included in the first set of storage units and the second set of storage units. | 10-02-2008 |
| 20090204623 | GENERATING A VALUE ASSOCIATED WITH ONE OF A PLURALITY OF LEAF NODES BY IMPLICITLY RANDOMLY CLIMBING AN IMPLICIT TREE HAVING THE LEAF NODES - Provided are a method, system and article of manufacture for generating a value associated with one of a plurality of leaf nodes by implicitly randomly climbing an implicit tree having the leaf nodes. A determination is made of an ancestor node of a current node, wherein each ancestor node at a level of the ancestor node is associated with a different set of ordered leaf nodes, wherein there is a unique value associated with each leaf node. A determination is made of a first leaf node of the ordered leaf nodes associated with the determined ancestor node. A determination is made as to whether the determined ancestor node is a rightmost ancestor node at the level of the ancestor node. A first formula is used to determine a last leaf node of the ordered leaf nodes associated with the determined ancestor node in response to determining that the ancestor node is the rightmost ancestor node. A second formula different form the first formula is used to determine the last leaf node in response to determining that the ancestor node is the rightmost ancestor node. A value associated with a selected leaf node is generated that is between the determined first and last leaf nodes in response to determining to climb to the ancestor node of the current node and in response to determining not to climb to a further ancestor node of the determined ancestor node, wherein the generated value is used in a computational process. | 08-13-2009 |
| 20090248917 | USING PRIORITY TO DETERMINE WHETHER TO QUEUE AN INPUT/OUTPUT (I/O) REQUEST DIRECTED TO STORAGE - Provided are a method, system, and article of manufacture for using priority to determine whether to queue an Input/Output (I/O) request directed to storage. A maximum number of concurrent requests directed to a storage is measured. The measured maximum number of concurrent requests is used to determine a threshold for a specified priority. Subsequent requests of the specified priority directed to the storage are allowed to proceed in response to determining that a current number of concurrent requests for the specified priority does not exceed the determined threshold for the specified priority. Subsequent requests directed to the storage having a priority greater than the specified priority are allowed to proceed. Subsequent requests directed to the storage having the specified priority are queued in a queue in response to determining that the current number of concurrent requests for the specified priority exceeds the overall threshold. | 10-01-2009 |
| 20090259752 | DYNAMIC DISTRIBUTED ADJUSTMENT OF MAXIMUM USE OF A SHARED STORAGE RESOURCE - A method, system, computer program product, and computer program storage device for dynamically adjusting a maximum limit of concurrent service requests directed to a shared storage resource that can be issued by a plurality of host devices is disclosed. The method, system, computer program product, and computer program storage device operate based on a rotating turn, in which a host device has a chance to be able to increase its currently available maximum number of concurrent service requests. | 10-15-2009 |
| 20100174867 | USING DIFFERENT ALGORITHMS TO DESTAGE DIFFERENT TYPES OF DATA FROM CACHE - 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. | 07-08-2010 |
| 20110055171 | GENERATION OF REALISTIC FILE CONTENT CHANGES FOR DEDUPLICATION TESTING - Method, system, and computer program product embodiments for facilitating deduplication product testing in a computing environment are provided. In one such embodiment, data to be processed through the deduplication product testing is arranged into a single, continuous stream. At least one of a plurality of random modifications are applied to the arranged data in a self-similar pattern exhibiting scale invariance. A plurality of randomly sized subsets of the arranged data modified with the self-similar pattern is mapped into each of a plurality of randomly sized deduplication test files. | 03-03-2011 |
| 20110066767 | DATA MIGRATION TO HIGH SPEED STORAGE IN ACCORDANCE WITH I/O ACTIVITY OVER TIME - Methods, controllers for data storage, data storage systems, and computer program products are directed to migrating data after the initial placement of the data in data storage entities having higher speed and in other data storage. Steps of a method to migrate data to the higher speed data storage are (1) identifying at least one group of data having had at least one I/O activity in each of a plurality of intervals of time, occurring over a string of multiple intervals of time, wherein the I/O activity is with respect to the other data storage from which data is to be migrated. The time for each of the multiple intervals is selected such that bursts of the I/O activity are likely to be contained in one interval. (2) The identified group of data is classified to the higher speed data storage and migrated. | 03-17-2011 |
