Abstract: Illustrative embodiments disclose shrinking a file system in a data processing system by designating an amount by which the file system stored in a memory and comprised of a plurality of contiguous logical blocks is to be shrunk. At least one contiguous intermediate logical block of the plurality of contiguous logical blocks from the file system is removed to shrink the file system by the designated amount. A record is maintained indicating a first intermediate logical block of the at least one contiguous intermediate logical block at which the removing starts, and a last intermediate logical block of the at least one contiguous intermediate logical block at which the removing ends.

Abstract: Computer implemented method, system and computer program product for shrinking a file system in a data processing system. A computer implemented method for shrinking a file system in a data processing system includes designating an amount by which a file system comprised of a plurality of contiguous blocks is to be shrunk, and removing at least one contiguous intermediate block of the plurality of contiguous blocks from the file system to shrink the file system by the designated amount.

Abstract: Computer implemented method, system and computer program product for shrinking a file system in a data processing system. A computer implemented method for shrinking a file system in a data processing system includes designating an amount by which a file system comprised of a plurality of contiguous blocks is to be shrunk, and removing at least one contiguous intermediate block of the plurality of contiguous blocks from the file system to shrink the file system by the designated amount.

Abstract: A system and method for dynamically altering a Virtual Memory Manager (VMM) Sequential-Access Read Ahead settings based upon current system memory conditions is provided. Normal VMM operations are performed using the Sequential-Access Read Ahead values set by the user. When low memory is detected, the system either turns off Sequential-Access Read Ahead operations or decreases the maximum page ahead (maxpgahead) value based upon whether the amount of free space is simply low or has reached a critically low level. The altered VMM Sequential-Access Read Ahead state remains in effect until enough free space is available so that normal VMM Sequential-Access Read Ahead operations can be performed (at which point the altered Sequential-Access Read Ahead values are reset to their original levels).

Abstract: A system and method for dynamically altering a Virtual Memory Manager (VMM) Sequential-Access Read Ahead settings based upon current system memory conditions is provided. Normal VMM operations are performed using the Sequential-Access Read Ahead values set by the user. When low memory is detected, the system either turns off Sequential-Access Read Ahead operations or decreases the maximum page ahead (maxpgahead) value based upon whether the amount of free space is simply low or has reached a critically low level. The altered VMM Sequential-Access Read Ahead state remains in effect until enough free space is available so that normal VMM Sequential-Access Read Ahead operations can be performed (at which point the altered Sequential-Access Read Ahead values are reset to their original levels).

Abstract: Methods, systems, and computer program products are provided for disk quota management. Embodiments include assigning a user to a limits class, receiving, from a user, a request to store a resource, and determining whether to allow the user to store the resource in dependence upon the limits class and current disk usage of the user. In some embodiments, determining whether to allow the user to store the resource in dependence upon the limits class and current disk usage of the user includes retrieving a user record for the user, retrieving a limits record in dependence upon the user record, and comparing the user's current disk space usage in the user record and the size of the resource with the disk space usage maximum in the limits record.

Abstract: A mechanism is provided for maintaining quota information in extended attributes associated with a quota data file. A quota data file includes file control information, including attributes such as a file name. The quota data file control information includes a reference to an extended attributes directory. Each user record is stored as an extended attribute in the extended attributes directory. Each extended attribute also has file control data. The quota information for a user is stored in-line in the file control data.

Abstract: A system and method for capturing a point-in-time image of a file system utilized within a data storage system employing logical volumes mapped across physical volumes. The point-in-time backup process begins with receipt of a file system backup request. In response to receiving the file system backup request, buffered file system data is written or flushed to the logical volumes. Specifically, in response to the file system backup request, buffered user data is written to the logical volumes, buffered meta data associated with the buffered user data is written to a file system backup log within the logical volumes, and the buffered meta data is written to the logical volumes. A disk copy of the designated physical volumes is initiated in response to the writing of the buffered file system data to the logical volumes.

Abstract: A system and method for capturing a point-in-time image of a file system utilized within a data storage system employing logical volumes mapped across physical volumes. The point-in-time backup process begins with receipt of a file system backup request. In response to receiving the file system backup request, buffered file system data is written or flushed to the logical volumes. Specifically, in response to the file system backup request, buffered user data is written to the logical volumes, buffered meta data associated with the buffered user data is written to a file system backup log within the logical volumes, and the buffered meta data is written to the logical volumes. A disk copy of the designated physical volumes is initiated in response to the writing of the buffered file system data to the logical volumes.