Compaq ProLiant 6000 Compaq DLT Tape Array II: High-Performance Backup of Ente - Page 19

Ompressibility And, Erformance

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 19 highlights

ECG075.0997 (cont.) DLT Tape Array II ... TEST 6 COMPRESSIBILITY AND 35/70 GB DLT TO 15/30 GB DLT PERFORMANCE Windows NT 4.0 Cheyenne ARCserve 6.0 for Windows NT Image 2 GB 1:1, 2:1, 4:1, 8:1 RAIT-0 ProLiant 5000, two Pentium Pro 200 processors, 256K cache, 256 MB RAM 96-GB array (two SMART-2/P Array Controllers with twenty-four 4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To compare the performance of the new 35/70 GB DLT drive with that of the 15/30 GB DLT drive. Though the new drive is faster and holds more, there are cases where the 15/30 GB DLT drive may still be a better match for the backup application. The 35/70 GB DLT drive, with its larger cache and higher throughput rating, is three times faster than the 15/30 GB DLT drive. In all compression categories, the 35/70 GB DLT drive is the top in its class in performance. However, in some backup scenarios (feeding the enterprise backup server with multiple 10MB Ethernet connections) the 15/30 GB DLT drive speed still exceeds the feed speed of the network link. In these cases, the 15/30 GB DLT drive is an excellent choice, and the use of the Compaq DLT Library is a very attractive and logical option. The decision between the DLT Library and the DLT Tape Array II is based on backup requirements and the environment. The DLT Tape Array II is fast, but a single (4 tape drive) unit is only capable of storing 280 GB native (560 GB compressed) of tape online. Any backup exceeding those amounts risks significant delays while waiting for an operator to change tapes. The DLT Library has a 15-tape capacity. Eight single-drive DLT Library units (with 15/30 GB DLT drives) would deliver a capacity of 1,800 GB native (3,600 GB compressed). The DLT Library can have two drives per unit. The speed and capacity of this system makes it an ideal solution for network backups. An example of a typical setup might be a central backup server with four DLT Library units (each with two tape drives). This will support eight simultaneous backup jobs from eight network-connected remote servers or systems. Using groups of tapes, this system (which has been tested by Compaq with Cheyenne software) can perform a weekly full backup of the remote systems, as well as a daily incremental backup. This is a totally automated backup procedure, with no human intervention required. Of course, sets of tapes can be rotated for archiving.

  • 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
T
EST
6
C
OMPRESSIBILITY AND
35/70 GB DLT
TO
15/30 GB
DLT P
ERFORMANCE
Windows NT 4.0
Cheyenne ARCserve 6.0 for Windows NT
Image
2 GB
1:1, 2:1, 4:1, 8:1
RAIT-0
ProLiant 5000, two Pentium Pro 200 processors, 256K
cache, 256 MB RAM
96-GB array (two SMART-2/P Array Controllers
with twenty-four 4-GB drives)
35/70 GB DLT drive(s)
Wide-Ultra SCSI-3 cards
(All Compaq off-the-shelf products)
To compare the performance of the new 35/70 GB DLT drive with that of the 15/30 GB DLT
drive. Though the new drive is faster and holds more, there are cases where the 15/30 GB DLT
drive may still be a better match for the backup application.
The 35/70 GB DLT drive, with its larger cache and higher throughput rating, is three times
faster than the 15/30 GB DLT drive. In all compression categories, the 35/70 GB DLT drive is
the top in its class in performance. However, in some backup scenarios (feeding the enterprise
backup server with multiple 10MB Ethernet connections) the 15/30 GB DLT drive speed still
exceeds the feed speed of the network link. In these cases, the 15/30 GB DLT drive is an
excellent choice, and the use of the Compaq DLT Library is a very attractive and logical option.
The decision between the DLT Library and the DLT Tape Array II is based on backup
requirements and the environment. The DLT Tape Array II is fast, but a single (4 tape drive)
unit is only capable of storing 280 GB native (560 GB compressed) of tape online. Any backup
exceeding those amounts risks significant delays while waiting for an operator to change tapes.
The DLT Library has a 15-tape capacity. Eight single-drive DLT Library units (with 15/30 GB
DLT drives) would deliver a capacity of 1,800 GB native (3,600 GB compressed).
The DLT Library can have two drives per unit. The speed and capacity of this system makes it
an ideal solution for network backups. An example of a typical setup might be a central backup
server with four DLT Library units (each with two tape drives). This will support eight
simultaneous backup jobs from eight network-connected remote servers or systems. Using
groups of tapes, this system (which has been tested by Compaq with Cheyenne software) can
perform a weekly full backup of the remote systems, as well as a daily incremental backup.
This is a totally automated backup procedure, with no human intervention required. Of course,
sets of tapes can be rotated for archiving.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.