Network file server maintaining local caches of file directory i

Details Network file server maintaining local caches of file directory i Network file server maintaining local caches of file directory i

1996-11-13

1999-08-31

Dinh, Dung C.

Electrical computers and digital processing systems: multicomput

Multicomputer data transferring via shared memory

Plural shared memories

711145, 711118, 707 8, 707 7, G06F 15163

Patent

active

059447893

ABSTRACT:
A network file server includes an integrated cached disk array and a plurality of data mover computers linking the cached disk array to the data network for file access. Each data mover computer maintains a local cache of file directory information including locking information of locked files that are accessible through the data mover. A cache consistency scheme ensures that shared locking information is consistent in the local caches. In a preferred embodiment, the cache consistency scheme uses an internal data link to pass messages between the data movers. The file directory information in the local cache includes information mapping file names to a list of logical blocks for each file name, file attributes that affect data access, and locking information down to a block level of granularity. Each data mover computer has network file manager software that maintains client ownership of locked files and communicates with the clients, and data mover file manager software that manages data mover computer ownership of locked files and communicates with other data mover computers. The cache consistency messages indicate a grant of data mover ownership over a file, a release of data mover ownership over a file, a denial of a request for access to a locked file, and changes to file attributes affecting access to a file. The local caches and the cache consistency scheme eliminate any need to store file locking information in the cached disk array.

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