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Method for accessing a device instant copy via a named data stream or extended attribute attached to the parent device special file.

IP.com Disclosure Number: IPCOM000131730D
Original Publication Date: 2005-Nov-17
Included in the Prior Art Database: 2005-Nov-17
Document File: 1 page(s) / 25K

Publishing Venue

IBM

Abstract

Method for accessing a device instant copy via a named data stream or extended attribute attached to the parent device special file.

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Method for accessing a device instant copy via a named data stream or extended attribute attached to the parent device special file .

Many external raid arrays that exist today have the ability to create an instant copy of a logical device which among other things can be used to make an backup of the data contained on one or more of those logical devices. On a typical large installation of a UNIX* OS such as AIX** there can be thousands of physical and logical disks attached to one machine. Searching thousands of disks for an instant copy of one or more specific disks can be time consuming for an application or a volume manger that sits on top of the disks. It is therefore proposed that a disk configuration manager create a named data stream or extended attribute that when opened will actually open the instant copy of the disk. By definition an object like a named data stream or extended attribute is just data within the file system that contains the object.

A file system such as JFS on AIX would be enhanced so that a new type of extended attribute could be created that is really equivalent to a device special file rather than data within the file system that contains the extended attribute. This would involve making changes to system commands and libraries , the logical file system layer, and underlying physical file system. The system commands and libraries would be enhanced such that extended attribute information about the new target new device is supplied to the logical file system and this...