Browse Prior Art Database

Network Attached Storage with Plug-and-play Interface for Direct Storage Attachment

IP.com Disclosure Number: IPCOM000016041D
Original Publication Date: 2003-Jan-10
Included in the Prior Art Database: 2003-Jun-21
Document File: 2 page(s) / 116K

Publishing Venue

IBM

Abstract

Network Attached Storage with Plug-and-play Interface for Direct Storage Attachment Disclosed is an apparatus to be connected both to LAN/WAN via a network card and to a host system via a system high-speed bus. Each connection is selective according to the Plug-and-Play state of this apparatus via the host system bus. The system can detect whether a host system is attached or not at power-on time. (Figure 1-A) The behavior of the system is changed according to the host system attachment. If the system is not attached with the host system, it will work as a normal Network Attached Storage. Therefore a operating system working on the system will enable the network card as a physical interface for network file system. (Figure 1-B) If the system is attached with the host system at power-on time, the entire system will work as a local storage device, i.e. a Direct Attached Storage of the host system.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

  Network Attached Storage with Plug-and-play Interface for Direct Storage Attachment

Network Attached Storage with Plug-and-play Interface for Direct Storage Attachment

Disclosed is an apparatus to be connected both to LAN/WAN via a network
card and to a host system via a system high-speed bus. Each connection is
selective
according to the Plug-and-Play state of this apparatus via the host system
bus.

    The system can detect whether a host system is attached or not at
power-on time.
(Figure 1-A) The behavior of the system is changed according to the host
system
attachment. If the system is not attached with the host system, it will work
as a normal
Network Attached Storage. Therefore a operating system working on the system
will enable
the network card as a physical interface for network file system. (Figure 1-B)

    If the system is attached with the host system at power-on time, the
entire system
will work as a local storage device, i.e. a Direct Attached Storage of the
host system.

Therefore a operating system working on the system will disable the network
card and can
respond to the host system according to a certain storage protocol such as
IDE, SCSI, or
Fiber Channel protocol. (Figure 1-C)

    In addition to the above, the system can detect the host system
attachment at normal
operation mode. When the system is working as Network Attached Storage shown
as (Figure 1-B)
and the host system is attached, the system will start PnP Device Attach
operation shown as
(Figure 1-E). First the operating system can complete any write operation from
network and
then it will disable the network card interface to ready to shut down its
Network Attached
Storage function. Therefore the system can work as Direct Attached Storage via
the state
transition from (1-E) to (1-C) via (1-A).

    When...