Compaq ProLiant 6000 Compaq DLT Tape Array II: High-Performance Backup of Ente - Page 34

Tape III XT or DLT Tape IV, the DLT Tape IV delivers optimum performance. The DLT Tape

Get Compaq ProLiant 6000 PDF manuals and user guides View all Compaq ProLiant 6000 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 34 highlights

ECG075.0997 (cont.) DLT Tape Array II ... Although the drive can read half-inch DLT media labeled DLT Tape II, DLT Tape III, DLT Tape III XT or DLT Tape IV, the DLT Tape IV delivers optimum performance. The DLT Tape IV medium holds a minimum of 35 GB of uncompressed data. The 70 in 35/70 GB DLT refers to the drive's ability to compress data, usually at a factor of at least 2:1. The drive can compress some data at more than 8:1, but to be conservative, the industry uses 2:1 as an average figure. When backing up servers containing an assortment of general end-user file data, the DLT Tape Array II easily exceeds 100 GB per tape cartridge. The DLT Tape IV has a minimum shelf life of 30 years if stored properly. Its rated usage is 500,000 passes (filling the tape more than 9,000 times); however, it is suggested that tapes be rotated on a more frequent schedule. Most tape drives have a 15 to 25 percent duty cycle, which means the manufacturer expects them to actually be writing tape some small percentage of time during their installed lives. The DLT drive is a 100 percent duty cycle rated device: While it won't be writing 100 percent of the time, the drive is tougher and can be used more often, with greater trust in its reliability than drives with a lower percentage duty cycle.

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
7
%
(cont.)
DLT Tape Array II
ECG075.0997
Although the drive can read half-inch DLT media labeled DLT Tape II, DLT Tape III, DLT
Tape III XT or DLT Tape IV, the DLT Tape IV delivers optimum performance. The DLT Tape
IV medium holds a minimum of 35 GB of uncompressed data. The 70 in 35/70 GB DLT refers
to the drive’s ability to compress data, usually at a factor of at least 2:1. The drive can compress
some data at more than 8:1, but to be conservative, the industry uses 2:1 as an average figure.
When backing up servers containing an assortment of general end-user file data, the DLT Tape
Array II easily exceeds 100 GB per tape cartridge. The DLT Tape IV has a minimum shelf life
of 30 years if stored properly. Its rated usage is 500,000 passes (filling the tape more than 9,000
times); however, it is suggested that tapes be rotated on a more frequent schedule.
Most tape drives have a 15 to 25 percent duty cycle, which means the manufacturer expects
them to actually be writing tape some small percentage of time during their installed lives. The
DLT drive is a 100 percent duty cycle rated device: While it won’t be writing 100 percent of
the time, the drive is tougher and can be used more often, with greater trust in its reliability than
drives with a lower percentage duty cycle.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.