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AIX mirrored filesystem extension keeping copies on separate ESS subsystem (campus oriented mirroring)

IP.com Disclosure Number: IPCOM000021942D
Original Publication Date: 2004-Feb-17
Included in the Prior Art Database: 2004-Feb-17
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Abstract

Method for increasing the size of mirrored filesystems ensuring that data copies are kept on specific storage server sets.

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AIX mirrored filesystem extension keeping copies on separate ESS subsystem (campus oriented mirroring)

Disclosed is a method for increasing the size of mirrored filesystems ensuring that data copies are kept on specific storage server sets.

    Highly available solutions require data to be available even in case of storage subsystem outage through data duplication on separate and independent hardware. A very common solution is to have two or more storage subsystems and to have the operating system mirror data on them. Normally this configuration is built on a campus-oriented cluster and storage servers are located on separate buildings, thus creating two independent hardware failure groups. Data availability is kept as far as the two copies of data are stored on separate failure groups.

    Mirrored filesystem creation is easily made using operating system by allocating storage space on one failure group for first copy and then mirroring data on the second group. Problem arises when filesystem is extended, either by administrator or by automatic tools. Operating system has no knowledge of physical location of storage servers but so it is not guaranteed that additional disk partitions are allocated keeping data copies on hardware belonging to different failure groups.

    Disclosed method ensures that mirrored copies are always kept on different failure groups during file system extension.

    Administrator provides two lists of storage servers serial numbers representing the two...