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Overview

Area of Application

Modules and Process Workflow

Detailed Specifications

Resource System

Local work

Networking

Hardware Requirements

Delivery Set

Examples

Documentation on-line

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Networking

The project data storage system, focused on distributed network processing, is a distinguishing feature of the PHOTOMOD system.
Network processing of projects (work via “profile”) is performed simultaneously from multiple workstations.
Several options, each having its advantages as well as disadvantages, are involved in the implementation of network processing.

Distribution of resources on workstations

Profile resources can be located on several workstations in the local network. Any number of profiles can be created in a network. All folders used for storing data should be open for public read-write access.

Recommendations:

  • Resources should always be stored on a separate computer(s) that is not used as a workstation. This is to safeguard against resource data access failures caused by workstation malfunctions.
  • Distribute resources among several drives to use available disk space most efficiently.
  • Install the hard lock key on a separate computer without resource-intensive tasks, which can lead to protection failures and disrupt PHOTOMOD processing on workstations.

For simultaneous editing of the same file, the rule is always−except in the case of explicit messages or warnings — “the last saved data is stored.” Browsing is not limited, allowing the same project files to be open simultaneously on any number of computers.

The best way to organize network-based workflow using network computers to store resources is described below:
1. Create a central control folder on any workstation. Configure read-write network access to that computer.
2. Create network profile(s) in this repository and setup resource configurations for each. Connect the virtual folders.
3. Configure use of central control folder on all workstations. All network profiles, for which configurations are stored in the central control folder, will be available on workstations displayed in the Control Panel profile list. Select network profile and activate it. Restart all open PHOTOMOD modules for changes to take effect.

See also PHOTOMOD resource system.

Distribution of resources on servers

When working with network projects, dedicated file-servers, which are not used as workstations, are recommended.

Close attention must be paid to choosing and configuring the OS for the computer intended for use as file-server in network processing. FreeBSD is recommended for this purpose; less preferable operating systems include Microsoft Windows Server and Linux. Our tests have shown that these operating systems are the best server platforms for photogrammetric processing. Windows (XP, Vista, 7) OS limits the number of simultaneous network connections. Simultaneous work with a non-server version OS will be difficult, if the number of workstations in a network exceeds 8.

Proposed network configuration:

Profile resources should ideally be placed in multiple virtual folders located on different servers. The optimal number of folders will depend on volume. “One disk = one virtual folder” is a good rule of thumb.

When distributed processing can be performed using many workstations and a single profile, a more uniform load distribution is provided across the aggregate bandwidth of the disk system of servers and network.

Organizational examples of network processing using file-servers.

  • A small project or group of projects:

    1.Create a network profile in a centralized directory server. Select one drive or folder server (depending on project size), allocate virtual folders for resource storage and define the virtual folders.

    2. 2. Connect created network profile to all workstations participating in network processing. To do this, specify central control folder in initial setup of each workstation, select network profile and activate it. Then, restart all open PHOTOMOD modules for changes to take effect.

    This data organization makes backups convenient, since all resources are placed in the same location, and there is no loss in speed while simultaneously processing small volumes.

    Example of network profile creation using one server drive to store resources
  • If a project (or group of projects) assumes large volumes, resources should be placed on multiple file servers or several different server drives. Resources should be allocated with convenient backup in mind.

    Server resource allocation strategies:

    • Strategy 1. Connect server drives as virtual folders to store images, and separate server drives to store projects. Administrator involvement is desirable for structural organization and to monitor availability of free space on server drives.

      Example of network profile creation using different server drives to store images and separate network profile for project files
    • Strategy 2. Select server drives (folders) to store images and connect them to a profile by using a virtual folder. Separate server drive(s) should be selected as virtual folders to store projects. All storages connected using a virtual folder will be filled with data automatically. PHOTOMOD system analyzes free space and distributes resources accordingly. This strategy uses all storage space allocated for images, and facilitates the work of the administrator.

    Example of network profile creation using a group of storages for images and separate server for project files.

    Connect network profile, created by one of the above strategies, to all workstations participating in network processing. To do this, specify central control folder in initial setup of each workstation, select network profile and activate it. Then, restart all open PHOTOMOD modules for changes to take effect.

See also PHOTOMOD resource system.

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Last modified: 19.02.2018© Racurs, 2004-2018