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If you are installing SUSE on a server, we always recommend that you disconnect the server from the SAN fabric. (This is a term that refers to the fiber network connecting all the devices.) It used to be that Linux installers could potentially pick up the LUNs accessible on the SAN before the onboard storage, and an unsuspecting administrator could install the operating system onto the SAN, or even worse, destroy data on a SAN. A QLA card is seen by the Linux kernel as a SCSI card. Even though the SAN runs on fiber, it is still SCSI and is treated as such by the system. When the Qlogic card is initialized and scans the fiber for devices, if it finds any, it then assigns a SCSI device to that piece of storage, which is then accessible as a standard disk.

A logical unit number (LUN) is a piece of storage created in the SAN and is integral to the use and design of a SAN. A LUN is a number assigned to an area of storage, and from the point of view of the server does not have anything to do with a physical disk. When a LUN is created, it is likely that the defined LUN will span many disks, as in Figure 26-5.

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Figure 26-5: Composition of a LUN Each LUN is presented as a single disk to the servers, and LUN masking can be used to direct a LUN to a specific server or servers. LUN masking is very important in a shared storage environment. Imagine connecting five servers to a SAN and all servers having access to all created LUNs. If one server goes crazy and starts writing data to a LUN it is not supposed to, or accessing a file it should not, you will find your data corrupted very quickly. LUN masking defines a mapping of LUNs to servers using the World Wide Name (WWN) of the server HBA. Defining an explicit mapping stops the previously mentioned situation from happening. A server that does not have a mapping has no idea a LUN exists, and the operating system does not have to know or be aware of how or why LUN masking works. The important thing to remember about a LUN is that it is seen and accessed as a single disk device in Linux. Partitions and filesystems are then created upon this LUN and used by Linux.

the effect of upgrading or reinstalling the operating system at a later time How does paritioning of the disk help here Exercise 4.5 Imagine the situation in which you install every independent software package in a directory of its own. Write a script which builds and updates the PATH variable for users automatically, so that the software will be accessible from a command shell. Exercise 4.6 Describe what is meant by a URL or universal naming scheme for files. Consider the location of software within a directory tree: some software packages compile the names of important files into software binaries. Explain why the use of a universal naming scheme guarantees that that the software will always be able to find the files even when mounted on a different host, and conversely, why cross mounting a directory under a different name on a different host is doomed to break the software. Exercise 4.7 ref. [148]. Upgrade the kernel on your GNU/Linux installation. Collect the kernel from

7. Explain how architecture selection can be used to avoid overfitting. 8. Explain how active learning can be used to avoid overfitting. 9. Consider the sigmoid activation function. Discuss how scaling of the training data affects the performance of NNs. 10. Explain how the Huber function makes a NN more robust to outliers.

In certain situations, it is useful to share a single LUN between servers. This is most common in a highly available cluster, such as a database. Take Oracle 9i RAC as an example; all the database table spaces are stored on a shared medium (in this case a SAN) and accessed by multiple instances of the database. As both database instances are accessing the same storage, the database needs to be aware of what files and portions of the files each is accessing. This is called locking. When an instance needs write access to a tablespace, it needs to lock a portion of the file so that the other instance does not try to write or destroy that data that is being worked upon.

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