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FIGURE


5.3 The NetWare architecture


NLMs fall into four categories:


■    Disk drivers


■    LAN drivers


■    Name space modules


   Utilities

Disk Drivers


These NLMs give NetWare access to the disk channel. Older disk-driver NLM files have a .DSK extension, whereas newer disk drivers (those that conform to the NetWare Peripheral Architecture, or NPA) have the extension .HAM or .CDM. For NetWare 5, a combination of IDEATA.HAM and IDEHD.CDM provides access to local Integrated Drive Electronics (IDE) drives. NetWare versions 4.1 and later can use this technology, which is the only type of disk-driver technology available for NetWare 5. For example, the IDE.DSK file is the disk driver that allows NetWare 3.x to access local IDE drives, but this file won’t work on NetWare 5 servers. You would have to use the IDEATA.HAM and IDEHD.CDM combination.

LAN Drivers


Every network board installed in a NetWare server must have a corresponding LAN driver, which is the interface between the NetWare kernel and the network interface card. These files typically have the file extension .LAN. For example, the 3C5X9.LAN file is the driver that allows NetWare to access a 3Com EtherLink III NIC.


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Name Space Modules


As mentioned, NetWare can “look” like another type of server. Part of that functionality is configured by the protocols in use. A name space module controls how files look or how they are stored on a disk. By default, NetWare stores files using the DOS naming convention (eight alphanumeric characters, a period, and then a three-letter extension; also called 8.3). Different operating systems use different naming conventions for files, and the name space modules make it possible to store those files on volumes on a NetWare server. The extension of these name space modules is .NAM. For example, the NFS.NAM name space module enables NetWare to store files on a disk using the Unix NFS (Network File System) naming convention. Additionally, if you want to store files that use the Windows long filename naming convention, you load the LONG.NAM names.

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