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The bottom layer of the operating system, are the drivers. In NetWare, all drivers are available as modules the so-called NLMs (NetWare Loadable Modules). These drivers make it possible to use the different hardware components connected to the server. NLMs are only loaded when needed: they aren t part of the kernel itself. There is, however, no mechanism that loads the drivers dynamically if needed; thus, the administrator needs to create configuration files that instruct the system to load these drivers upon startup. Normally, this is done in STARTUP.NCF and AUTOEXEC.NCF (discussed in later sections of this chapter). NetWare uses two different kinds of drivers: drivers for network interface cards and drivers for hard disks and other storage devices. These drivers can be identified by their extensions. Drivers for the network card always have the extension .LAN. For instance, you might have a driver called 3C90X.LAN that s used to communicate with 3COM network cards in your server. Apart from the LAN drivers, drivers are also needed for your server s storage devices. These come in two different types, the first of which is the Host Adapter Module (HAM). This particular driver is used to communicate with the controller to which your storage device is connected such as SCSI controllers or IDE interfaces in your computer. Second are the Custom Device Modules (with the extension CDM), which communicate with the storage devices themselves.

The kernel is the heart of the operating system and provides all the fundamental services of the operating system, like the handling of interrupt requests and I/O. The NetWare kernel organizes several processes, dividing them into threads that can be handled by the scheduler and thus divided amongst all the processors available on the server. This functionality is known as Symmetric Multi Processing (SMP).

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18 rows selected. You can now see all of the rows, but you cannot see the data in the assigned_to column if the record is not assigned to you. This behavior is obviously quite different to what happens when you use column-level VPD, so which one you use will be determined by your requirements. The policy works with your applications. After you modify the report query to again select from the assigned_to column, you can test the results. Figure 5-30 shows the report you will see when logged in as jimb.

The last part of the NetWare operating system is the services and applications provided by the server. A NetWare server furnishes many different services on the network, which are implemented as NetWare Loadable Modules (NLMs). More advanced applications use modern application server frameworks like the exteNd application server. Some of the most important services on NetWare are Directory services: These services, implemented by the NLM DS.NLM, make sure that eDirectory can do its work. They locate the eDirectory database and give access to database records to users, servers, and services. DNS/DHCP services: The DHCP service provides all the workstations in a network with the configuration needed to connect with the network. A special feature of the Novell DHCP service (implemented in DHCPSRVR.NLM) is that it saves its information in eDirectory. The advantage is that the DHCP data can be replicated across the network and that other DHCP servers can access this data. The DNS service takes care that names of computers can easily be translated into IP addresses. On NetWare, the module NAMED.NLM provides this service. Web services: Like on the Linux platform, the well-known Apache web server is used to provide http service to the network. This server is not only needed to give access to HTML documents on a NetWare server, but Apache is also integral to the management of many other network services for instance, all web-based management programs like iManager and iMonitor need it to perform their tasks. iFolder services: iFolder is the service that synchronizes files between the user s workstation and the iFolder process running on a server. Novell Storage Services (NSS): This is the default file storage system on NetWare. It lets you save files on a fast journaling file system.

Figure 5-30. Column masking in the application If you logged in to the application as a different user, you would still be able to see all the rows, but the Assigned To column would show only that data that is assigned to you. As you can see, using VPD column-mask policies is an extremely powerful and flexible way to enable you to restrict the access that users have to data. This technique might be useful in many different scenarios. For example, you might mask the salary field of an employee report so that employees are able to see only their own salary, while managers can see the salary of everyone who works for them.

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