Compaq ProLiant 1000 DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 9

Low Total Cost of Ownership

Get Compaq ProLiant 1000 PDF manuals and user guides View all Compaq ProLiant 1000 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 9 highlights

ECG036/1297 7(&+12/2*< %5,() (cont'd) ... '$7 0HGLD 'XUDELOLW\ The DDS-3 DAT drives use a 12 GB data cassette (Figure 9). Figure 9: DAT tape cassette (actual size). Approximately 2000 passes (or 6000 hours of tape pulling) can be made over a section of tape in a DAT drive before performance degradation begins. A pass is defined as any forward or reverse motion of the tape media across the read or write heads. Tape pulling is defined as anytime the drive is reading, writing, or tensioning the tape. Depending on the backup application and various other factors, up to six passes occur during each backup session. From a practical standpoint, if a tape were used for a weekly backup, it should last for two years. However, because DDS cassettes are so inexpensive, Compaq recommends replacing them sooner to ensure a reliable backup. Low Total Cost of Ownership DDS-3 tape drives offer low total cost of ownership in two ways. First, DDS-3 drives are compatible with existing DDS-1 and DDS-2 media. This compatibility provides a natural upgrade path and investment protection for users of existing DDS format devices, reducing total cost of ownership. Because DDS-3 was also developed with future DDS formats in mind, the DDS-3 media are designed to be forward compatible. Second, DAT cassettes are inherently inexpensive. With other tape storage technologies, the cassette bodies are precision made to align the tape accurately with the heads. With DAT technology, the precision alignment capability is built into the drive mechanism instead. This makes DAT cassettes far less expensive than other forms of tape drive media. 

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
7
%
(cont’d)
ECG036/1297
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
The DDS-3 DAT drives use a 12 GB data cassette (Figure 9).
Figure 9: DAT tape cassette (actual size).
Approximately 2000 passes (or 6000 hours of tape pulling) can be made over a section of tape
in a DAT drive before performance degradation begins.
A
pass
is defined as any forward or
reverse motion of the tape media across the read or write heads.
Tape pulling
is defined as
anytime the drive is reading, writing, or tensioning the tape.
Depending on the backup
application and various other factors, up to six passes occur during each backup session.
From
a practical standpoint, if a tape were used for a weekly backup, it should last for two years.
However, because DDS cassettes are so inexpensive, Compaq recommends replacing them
sooner to ensure a reliable backup.
Low Total Cost of Ownership
DDS-3 tape drives offer low total cost of ownership in two ways.
First, DDS-3 drives are
compatible with existing DDS-1 and DDS-2 media.
This compatibility provides a natural
upgrade path and investment protection for users of existing DDS format devices, reducing
total cost of ownership.
Because DDS-3 was also developed with future DDS formats in mind,
the DDS-3 media are designed to be forward compatible.
Second, DAT cassettes are inherently inexpensive.
With other tape storage technologies, the
cassette bodies are precision made to align the tape accurately with the heads.
With DAT
technology, the precision alignment capability is built into the drive mechanism instead.
This
makes DAT cassettes far less expensive than other forms of tape drive media.