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Digital linear tape (DLT) was introduced by Digital Equipment Corporation in the mid-1980s, but Quantum Corporation owns the technology now The DLT tape is a half-inch reel-to-reel magnetic tape, where the tape cartridge contains one reel and the DLT drive the other The main advantages are fast data transfer rates, higher storage capacity, and higher reliability over DAT All this, of course, comes at a price to the customer
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FIGURE 10-11
A DAT tape drive
DLT drives store data on the tape differently than DAT drives do The data path is made up of parallel tracks recorded in a serpentine pattern What this means is that the rst track is written from one end of the tape to the other and then the heads are repositioned and the next track goes the opposite direction (again for the entire length of the tape) The drive continues to go back and forth, writing until the tape is full
Tape Rotation
When it comes to maintaining the network, you need to schedule a backup job and develop a backup schedule Many companies do a tape rotation They have daily, weekly, and monthly tapes, the rotation of which usually consists of 20 to 25 tapes, each with its purpose Sometimes this is called an autopilot rotation The backup software keeps a database and expects a certain tape on each day of the year
Backing Up Network Data
The most common is a 21-tape rotation consisting of 4 daily tapes for Monday through Thursday, 5 weekly tapes for each Friday (some months have 5 Fridays), and 12 monthly tapes for the last weekday of the month There are no backups on Saturday or Sunday It is a good idea to store the weekly or monthly tapes offsite to keep re or some major catastrophic event from ruining your data and your backups Offsite storage of tape backups is a critical part of your backup plan If you have a re in the of ce and it destroys your servers and tape backups, there wouldn t have been much point in having the backup at all Make sure that backups are stored offsite Along with tape rotations come tape libraries and tape arrays Tape libraries are designed to contain a series of tapes in a holder that is inserted into the tape mechanism to automate the rotation of tapes throughout the week If the amount of data is very large, the tape library may be used on a daily basis to rotate multiple tapes in and out of the various drives to make sure all data ts onto a tape Tape arrays, on the other hand, are similar to RAID technology with hard drives, wherein data is spread over a series of drives for instance, there might be a parity drive for fault tolerance addition Manufacturers claim that tape arrays increase the throughput because multiple drives are writing simultaneously It is extremely critical that you store copies of the backup offsite in case there is a disaster, such as re or ooding in your building If servers and backups are stored in the same location, the organization will be vulnerable to data loss
Full, Incremental, and Differential Backups
Backup software enables you to run three types of backups: full, incremental, and differential These are the three you may see on the exam, so we will focus on them The key to backing up data is to ensure that you can restore it in the event of a system failure These three types of backup will function well if you use them together correctly
Full Backup
A full backup backs up every le on the speci ed volume or volumes (or partitions) Many companies run a full backup every day, no matter what Under such a system, the restore process requires only the most recent tape However, a full backup
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