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While PC operating systems were designed in response to the waning of client/server systems, Solaris and other UNIX systems are firmly designed as client/server systems. While a PC is designed to run many high-powered applications using the local CPU, a client/server network is designed around the concept of multiple thin clients that access data and execute applications on a fat centralized server, or on a number of servers that are dedicated to one particular purpose. For example, a typical Solaris network might consist of hundreds of Sun Ray thin client systems, which are supported on the front line by several E450 departmental servers, as well as a set of rack-mounted 420R systems that run database, Web server, and development systems. The client/server topology is also reflected in the structure of UNIX services: client applications running on client systems are designed to connect through to server applications running on server systems. Sun was instrumental in initiating key distributed computing technologies, such as the Remote Procedure Call (RPC) technology used in the NFS protocol. In addition, the Remote Method Invocation (RMI) technology developed as part of the Java networking and distributed computing APIs allows objects to be passed around the network as seamlessly as RPC.

After you enable fsck for a particular file system, you can execute it on that system fsck checks the integrity of several features of the file system, the most significant of which is the superblock that stores summary information for the volume Since the superblock is the most modified item on the file system being written and rewritten when data is changed on a disk, it is the most commonly corrupted feature However, copies of the superblock are stored in many different locations to ensure that it can be reliably retrieved.

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The checks that fsck performs on the superblock include the following: A check of the file system size, which obviously must be greater than the size computed from the number of blocks identified in the superblock A check of the total number of inodes, which must be less than the maximum number of inodes A tally of reported free blocks and inodes If any of these values is identified as corrupt by fsck, the superuser can select one of the many superblock backups that were created during initial file system creation as a replacement for the current superblock We will examine superblock corruption and how to fix it in the section fsck Operations, later in the chapter In addition to the superblock, fsck also checks the number and status of cylinder group blocks, inodes, indirect blocks, and data blocks.

Since free blocks are located by maps stored in the cylinder group, fsck verifies that all the blocks marked as free are not actually being used by any files if they are, files could be corrupted If all blocks are correctly accounted for, fsck determines whether the number of free blocks plus the number of used blocks equals the total number of blocks in the file system If fsck detects any incongruity, the maps of unallocated blocks are rebuilt, although there is obviously a risk of data loss whenever a disagreement over the actual state of the file system is encountered fsck always uses the actual count of inodes and/or blocks if the superblock information is wrong, and it replaces the incorrect value if this is verified by the superuser.

When fsck examines inodes, it does so sequentially and aims to identify inconsistencies in format and type, link count, duplicate blocks, bad block numbers, and inode size Inodes should always be in one of three states: allocated (used by a file), unallocated (not used by a file), or partially allocated Partially allocated means that during an allocation or deallocation procedure, data has been left behind that should have been deleted or completed Alternatively, partial allocation could result from a physical hardware failure In both cases, fsck attempts to clear the inode The link count is the number of directory entries that are linked to a particular inode fsck always checks that the number of directory entries listed is correct by examining the entire directory structure, beginning with the root directory, and tallying the number of links for every inode.

For a demonstration in an educational setting, the Eco H2/O2 system available from Fuel Cell Store (see Supplier s Index) part no. 534407 offers a great way to demonstrate the principles in this chapter, in a nice, desk-mounted study of solar hydrogen electricity.

Clearly, the stored link count and the actual link count should agree; however, the stored link count occasionally differs from the actual link count This could result from a disk not being synchronized before a shutdown, for example, and while changes to the file system have been saved, the link count has not been correctly updated If the stored count is not zero but the actual count is zero, disconnected.

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