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so in the event of a full hardware failure, all of your data could still be lost unless it is stored safely offsite on a tape or CD-ROM. To circumvent concurrent drive corruption at the end of a disk s life, many administrators use drives of equivalent capacities from different manufacturers, some new and some used, in a RAID array. This ensures that drives are least likely to fail concurrently. RAID Levels 0 and 1 are most commonly used. RAID Level 0 involves parallelizing data transfer between disks, spreading data across multiple drives, thereby improving overall data transmission rates. This technique is known as striping. However, while RAID Level 0 can write multiple disks concurrently, it does not support redundancy, which is provided with RAID Level 1. This level makes an identical copy of a primary disk onto a secondary disk. This kind of mirroring provides complete redundancy: if the primary disk fails, the secondary disk is able to provide all data contained on the primary disk. Because striping and mirroring consume large amounts of disk space, they are costly to maintain per megabyte of actual data. Thus, higher RAID levels attempt to use heuristic techniques to provide similar functionality to the lower RAID levels, while reducing the overall cost. For example, RAID Level 4 stores parity information on a single drive, which reduces the overall amount of disk space required but is more risky than RAID Level 1. Software RAID solutions typically support both striping and mirroring. This speeds up data writing and makes provisions for automating the transfer of control from the primary disk to the secondary disk in the event of a primary disk failure. In addition, many software solutions support different RAID levels on different partitions on a disk, which may also be useful in reducing the overall amount of disk space required to store data safely. For example, while users might require access to a fast partition using RAID Level 0, another partition may be dedicated to a financial database that requires mirroring (thus RAID Level 1). Sun s DiskSuite product is currently one of the most popular software RAID solutions. Alternatively, custom hardware RAID solutions are also proving popular, because of the minimal administrative overhead involved with installing and configuring such systems. While not exactly plug and play, external RAID arrays such as the StorEdge A1000 include many individual disks that can be used to support both mirroring and striping, with data transfer rates of up to 40 Mbps. In addition, banks of fast-caching memory (up to 80MB) speed up disk writes by temporarily storing them in RAM before writing them to one or more disks in the array. This makes the RAID solution not only safe but significantly faster than a normal disk drive.
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CD writing and rewriting devices are rapidly gaining momentum as desktop backup systems that are cheap, fast, and, in the case of CD-RW, reusable. CD-R and CD-RW devices are reviewed in 14. These devices serve two distinct purposes in backup systems: while CD-RW discs are useful for day-to-day backup operations because they can be reused, CD-R technology is more useful for archiving and auditing purposes. For example, many organizations outsource their development projects to third-party
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contractors; in such a case, it is useful for both the contractor and the client to have an archival copy of what has been developed, in case there is some later disagreement concerning developmental goals and milestones. On the other hand, contracts involved with government organizations may require regular snapshots to satisfy auditing requirements. Since CD-R is a write-once, read-only technology, it is best suited to this purpose. CD-R is wasteful as a normal backup medium, because CD-Rs can be used only once. CD-RWs can be rewritten hundreds of times, with more than 600MB of storage capacity. DVD-R and DVD-RW are now replacing CD-R and CD-RW as the main distribution and backup media, respectively, for Solaris. These discs have approximately 4.7GB capacity in a single-layer drive, and more than 9GB in a dual-layer drive. While originally intended for storing video data, DVD-R and DVD-RW can now store any type of data.
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