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The following procedures should be followed to perform backup and restore operations.
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When selecting a backup medium, you should always attempt to best meet the requirements of rapid restoration, data integrity, and flexibility. The following are the four main media currently in use: Tapes Disk drives CD writing and rewriting technologies (CD-R and CD-RW) DVD writing and rewriting technologies (DVD-R and DVD-RW)
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Capacity and reliability criteria must also be considered: for example, while tapes are generally considered reliable for bulk storage, tape drives are much slower than a hard drive. However, a 20GB tape is much cheaper than an equivalent-capacity hard drive; the cost of any backup solution must be weighed against the value of the data being stored. It is also important to consider the size of the data being backed up, and how often data changes on a hard disk. These parameters affect how large the tapes need to be to store incremental dumps. For more information on choosing a bulk storage device, see the FAQ for the USENET forum comp.arch.storage at http://alumni.caltech.edu/ ~rdv/comp-arch-storage/FAQ-1.html.
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Tapes
Solaris supports tape drives from the old archive QIC 150 1/4-inch tape drives (with a maximum 250MB capacity), up to modern DAT and DLT systems. A QIC is a lowend drive that takes a two-reel cassette; QICs were used widely in many early Sun workstations. DAT tapes for Digital Data Storage 2 (DDS-2) drives have a capacity of 4 to 8GB, while tapes for the newer DDS-3 standard have 12 to 24GB capacity, depending on compression ratios. DDS-2 drives can typically record between 400 and 800 KBps, again depending on compression ratios. The transition from analog to digital encoding methods has increased the performance and reliability of tape-based backup methods, and they are still the most commonly used methods today. On the other hand, DLT drives have been popular in the enterprise because of their very large storage capacities: for example, a Compaq 1624 DLT drive can store from 35 to 70GB, depending on compression, which is much more than DAT drives can store. DLT drives also feature much higher transfer rates of from 1.25 to 2.5 Mbps. Of course, DLT drives are more expensive than DAT drives, and DAT drives have always been more costly than a QIC, although a QIC is generally much too small to be useful for most systems today. Today s new technologies, such as Advanced Intelligent Tape (AIT), Linear Tape-Open (LTO), and SuperDLT (SDLT), have capacities and transfer speeds of a few hundred gigabytes per tape equal to the performance and capacities of the hard disks used ten years ago.
Hard Drives
Because hard drives have the fastest seek times of all backup media, they are often used to store archives of user files that are copied from client drives using an SMB protocol service. In addition, hard drives form the basis of RAID systems. Thus, an array of RAID drives can work together as a single, logical storage device, collectively acting as a single storage system that can withstand the loss of one or more of its constituent devices. For example, if a single drive is damaged by a power surge, depending on the level of RAID protection, your system may be able to continue its functions with a minimum of administrator interference, with no impact on functionality, until the drive is replaced. Many systems now support hot swapping of drives, so that the faulty drive can be removed and replaced, with the new drive coming seamlessly online. You may be wondering, in the days of RAID, why would anybody consider still using backups: the answer is that entire RAID arrays are just as vulnerable to power surges as a single drive,
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