Operating System/400 (5722-SS1) 465
Operating System/400 (5722-SS1)
system has the characteristics of the Disk Operating System (DOS) and OS/2 file
systems.
• UDFS: The user-defined file system. This file system resides on the auxiliary storage
pool (ASP) of the user's choice. The user creates and manages this file system.
Independent ASPs in V5R1 utilize the UDFS structure.
You can interact with any of the file systems through a common interface – commands,
menus, displays, and APIs. This interface is optimized for the input/output of stream data, in
contrast to the record input/output provided through the data management interfaces.
Note: The QNTC file system lets you share data with servers that can communicate using the
Windows NT LM 0.12 dialect.
Features
• Support for storing information in stream files that can contain long continuous strings
of data
• A hierarchical directory structure
• A common interface that allows users and applications to access not only the stream
files, but also database files, documents, and other objects that are stored in the
iSeries server
• A common view of stream files that are stored locally on the iSeries server, an
Integrated Netfinity Server for iSeries, or a remote Windows NT server
• User applications can store and manipulate stream file sizes up to 256 GB in the root
(/), QOpenSys, and user-defined file systems
• A set of 64-bit UNIX-type APIs and easy mapping of existing 32-bit UNIX-type APIs to
64-bit APIs.
• Threadsafe Integrated File System API interfaces to access objects in a
multi-threaded job
• Text file I/O to convert between CCSIDs with characters of differing lengths
• PC created files (even read only files) can be managed through a command and API
interfaces
• Copy whole sub-trees on the iSeries without using an interactive interface or
user-written programming
• Pipes and First In First Out (FIFO) objects provide program to program communication
through file system objects. The dev/null character special file can be written to
forever, but is always empty when read. dev/null is useful for applications to discard
output from sub-applications without changing the sub-application.
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