Browse Prior Art Database

Synchronous Interleaved I/O File Server

IP.com Disclosure Number: IPCOM000099750D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Chase, KJ: AUTHOR [+4]

Abstract

An interleaved I/O file server synchronously retrieves and transfers files into a library.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Synchronous Interleaved I/O File Server

       An interleaved I/O file server synchronously retrieves
and transfers files into a library.

      A library control system comprises two servers--one that
handles all library reprocessing support and one that is strictly a
file server, responsible for storing and moving files within the
library.

      The file server uses VM/SP Inter-User Communications Vehicle
(IUCV) rather than a spool system to handle transferring data.  IUCV
provides for synchronous communications between processes (file
server machine and user machine).  This allows file transfers to be
done synchronously with the user request.  It also allows the file
server to communicate with multiple users concurrently, interleaving
blocks of data, rather than being restricted to servicing just one
user request at a time.

      Library control functions are divided between two service
machines--a library control (LC) machine and a file manager (FM)
machine.  The LC machine is responsible for all library control tasks
such as automatic reprocessing.  The LC does not function as the file
server.  The FM machine is responsible for file transfers only.  It
does no library processing tasks.

      The file server synchronously transfers files from multiple
users, and it operates on a level such that it deals only with blocks
of data.   After it transfers a block of data from an individual file
transfer request, it checks its interrupt queue f...