Glossary

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extent

A contiguous set of disk blocks allocated for a file and represented by three values: device identifier, starting block address (offset in the device) and length (number of contiguous blocks). The mapping methods in Advanced Client determine the list of extents and send the list to the backup agent.

A contiguous region of data within the address space of the object to which it belongs. A file extent consists of some number of bytes that are contiguous within the address space of the file, numbered from 0 to N, where N is the size of the file. A physical disk extent consists of some number of bytes that are contiguous on the disk; disk addresses are numbered from 0 to N, where N is the size of the disk. The minimal set of parameters that define an extent consists of a storage object identifier, byte offset, and byte length.

A contiguous region of data within the address space of the object to which it belongs. For example, a file extent consists of some number of bytes that are contiguous within the address space of the file, numbered from 0 to N, where N is the size of the file. A physical disk extent consists of some number of bytes that are contiguous on the disk - disk addresses are numbered from 0 to N, where N is the size of the disk. The minimal set of parameters that define an extent consists of a storage object identifier, byte offset, and byte length.

A continuous space on a disk or storage volume that is occupied by or reserved for a particular data set, data space, or file.

A logical database attribute that defines a group of contiguous file system data blocks that are treated as a unit. An extent is defined by a starting block and a length.

A group of contiguous file system data blocks treated as a single unit. An extent is defined by the address of the starting block and a length.