Compaq ProLiant 1000 DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 3

Introduction, Background Information - proliant 1600

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ECG036/1297 7(&+12/2*< %5,() (cont'd) ... INTRODUCTION An efficient, reliable, and cost-effective solution for backup of critical data is a requirement for companies of any size. Compaq has a strong record of providing industry-standard storage solutions to fit a variety of customer needs. Not everyone requires hundreds of gigabytes of storage or can afford the more expensive backup solutions designed for customers with much heavier backup loads. Increasingly, small and mid-size businesses use departmental servers, such as the Compaq ProLiant 1200, ProLiant 1600, or ProLiant 2500 servers with storage requirements of 24 GB or less. To meet the needs of mid-size businesses, Compaq has an affordable line of DAT drives that use the DDS recording format and provide fast, reliable data storage. This brief explains DAT and DDS technologies and the performance improvements of DDS-3 over DDS-2. This paper also explains why DDS-3 provides low total cost of ownership. Finally, this brief describes the Compaq 12/24 GB DAT Drive with DDS-3 format, including the backup software that it supports. BACKGROUND INFORMATION DAT technology was initially developed for consumer audio recording. DDS is a data storage format that was developed from DAT to provide high-density, high-quality, reliable computer data backups. The physical media (drive and tapes) are referred to as DAT, while the recording format is referred to as DDS. What is DAT? DAT is a digital recording technology that uses 3.81mm (0.15-inch) wide tape in a helical scan read/write recorder. Unlike other tape technologies that only have tape movement, helical scan has both tape and head movement. With tape and head movement, the tape speed is slower, incurring less tape wear and maintaining better control of the tape as it moves through the tape path. The read and write heads in a drive that uses helical scan are attached to a rotating transport drum, which sits at a 6-degree angle to the tape media (Figure 1). Data is recorded in diagonal stripes from bottom to top on the tape, which moves in the same direction as the drum. Figure 1: DAT helical scan recording. 

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(cont’d)
ECG036/1297
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INTRODUCTION
An efficient, reliable, and cost-effective solution for backup of critical data is a requirement
for companies of any size.
Compaq has a strong record of providing industry-standard storage
solutions to fit a variety of customer needs.
Not everyone requires hundreds of gigabytes of
storage or can afford the more expensive backup solutions designed for customers with much
heavier backup loads.
Increasingly, small and mid-size businesses use departmental servers,
such as the Compaq ProLiant 1200, ProLiant 1600, or ProLiant 2500 servers with storage
requirements of 24 GB or less.
To meet the needs of mid-size businesses, Compaq has an
affordable line of DAT drives that use the DDS recording format and provide fast, reliable
data storage.
This brief explains DAT and DDS technologies and the performance improvements of DDS-3
over DDS-2.
This paper also explains why DDS-3 provides low total cost of ownership.
Finally, this brief describes the Compaq 12/24 GB DAT Drive with DDS-3 format, including
the backup software that it supports.
BACKGROUND INFORMATION
DAT technology was initially developed for consumer audio recording.
DDS is a data storage
format that was developed from DAT to provide high-density, high-quality, reliable computer
data backups.
The physical media (drive and tapes) are referred to as DAT, while the
recording format is referred to as DDS.
What is DAT?
DAT is a digital recording technology that uses 3.81mm (0.15-inch) wide tape in a
helical
scan
read/write recorder.
Unlike other tape technologies that only have tape movement,
helical scan has both tape and head movement.
With tape and head movement, the tape speed
is slower, incurring less tape wear and maintaining better control of the tape as it moves
through the tape path.
The read and write heads in a drive that uses helical scan are attached to
a rotating transport drum, which sits at a 6-degree angle to the tape media (Figure 1).
Data is
recorded in diagonal stripes from bottom to top on the tape, which moves in the same direction
as the drum.
Figure 1: DAT helical scan recording.
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