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While restoring from backups is an excellent strategy for countering catastrophic failure, it is simply not an option for a production system that is experiencing single disk failures What is required is some level of content redundancy that retains more than one copy of a system s data across different disks To solve the capacity and redundancy problem, Solaris provides support for the redundant array of inexpensive disks (RAID) standard RAID defines a number of different levels that provide various types of striping and mirroring In this context, striping is the process of spreading data across different physical disks while presenting a single logical interface for the logical volume Thus, a striped disk set containing four 18GB drives would have a total logical capacity of 72GB This configuration is shown in Figure 16-1.

A different approach is offered by mirroring, with which a logical volume s contents are copied in real time to more than one physical device Thus, four 18GB drives could be mirrored to provide two completely redundant 18GB volumes This means that if one disk fails, its mirror is automatically used to continue to create, read, update, and delete operations on the file system, while the disk is physically replaced (again, with no reboot required) This kind of seamless operation requires minimal downtime This configuration is shown in Figure 16-2..

FIGURE 16-1

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FIGURE 16-2

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Alternatively, the four disks could be configured so that a 36GB striped volume could be created, combining the capacities of two disks, while the remaining two disks could be used to mirror this striped volume. Thus, the system is provided with a logical 36GB volume that also features complete redundancy. This configuration is shown in Figure 16-3. Six major RAID levels are supported by DiskSuite, the tool used to set up mirrored and striped virtual file systems on Solaris. RAID Level 0 is the primary striping level and allows a virtual file system to be constructed of several physical disks. Their capacities are effectively combined to produce a single disk with a large capacity. In contrast, RAID Level 1 is the primary mirroring level: all data that is written to the virtual file system

I like to think of fuel cells as a bit like a sandwich. If you can, imagine a cheese sandwich, with the two pieces of bread as the electrodes. Those pieces of bread are buttered. It is this butter that effects the interaction between the cheese and the bread the butter can be likened to the gas diffusion media.

FIGURE 16-3

Part IV:

Level 0 1 2 3 4 5 TABLE 16-1

Description Primary striping level, allowing a single virtual file system to be constructed of multiple physical disks Primary mirroring level, where all data written to a virtual file system is copied in real time to a separate mirroring disk A secondary mirroring level, which uses Hamming codes for error correction A secondary striping level, which writes parity information to a single drive, but writes all other data to multiple drives A secondary striping level, which writes parity information to a single drive, but writes all other data to multiple drives A striping and mirroring level, which allows data to be written to different disks, including parity information

is also copied in real time to a separate physical disk that has the same capacity as the original. This level has the slowest performance for writes, because all data must be written twice to two different disks; it also costs the most, because each drive to be mirrored uses a second drive that cannot be used for any other purpose. However, full redundancy can be achieved using RAID Level 1, and read performance is very good. The remaining RAID levels are variations on these two themes. RAID Level 2 is a secondary mirroring level that uses Hamming codes for error correction. RAID Levels 3 and 4 are secondary striping levels, writing parity information to a single drive, but writing all other data to multiple physical disks. In contrast, RAID Level 5 is a striping and mirroring level that allows data, including parity information, to be written to different disks. RAID 5 offers the best solution for systems that require both mirroring and striping. The RAID levels are summarized in Table 16-1.

The following procedure can be used to mount a local file system:

This website gives a particularly good animation that clearly illustrates what is happening inside a PEM fuel cell. www.humboldt.edu/~serc/animation.html

# mkdir /export/home # mount /dev/dsk/c0t3d0s5 /export/home # cd /export/home # mkdir pwatters # ls pwatters # cd /; umount /export/home

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