HP ProLiant 4000 DDS-3 Enhancing DAT Reliability, Capacity, and Performance
HP ProLiant 4000 Manual
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- HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 1
DQG3HUIRUPDQFH Mid-size businesses and branch offices using departmental servers with storage requirements of 24 GB or less and running with existing DDS-1 and DDS-2 media. This brief discusses DDS-3 technology and the Compaq 12/24 gigabyte (GB) DAT Drive, which is designed with DDS-3 technology. - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 2
for Compaq products are exclusively set forth in the documentation accompanying such products. Nothing herein should be construed as constituting a further or additional warranty. This publication does not constitute an endorsement of the product or products that were tested. The configuration or - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 3
mid-size businesses use departmental servers, such as the Compaq ProLiant 1200, ProLiant 1600, or ProLiant 2500 servers with storage requirements of 24 this brief describes the Compaq 12/24 GB DAT Drive with DDS-3 format, including the backup software that it supports. BACKGROUND INFORMATION DAT - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 4
from different tracks. Tracks Tape Direction Figure 3: Adjacent tracks are recorded at opposite angles, minimizing magnetic crosstalk. Compaq DAT Drive Product Line From the DDS format specification, Compaq developed a series of DAT drives using DDS technology, the first of which was the 2/4 GB DAT - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 5
and reliability. When considering all the new features, the drive price, the media price, and the overall reliability, it is easy to see DDS signals for the servomechanism. A system with an "embedded" servo, as in the Compaq 2/4 GB DAT and 4/8 GB DAT drives, uses the automatic track following (ATF) - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 6
reading ATF information from tracks immediately left and right of the primary track it is reading, the head centers its position on the track. The Compaq 12/24 GB DAT Drive does not use embedded servo tracking with ATF. Instead, it uses a timed tracking scheme that frees the ATF areas for - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 7
), which is nearly double that of DDS-2. This increase is due in part to the change from embedded servo format to the more efficient timed tracking format. The increase in frequency/bit density also plays a part in the faster transfer rate of DDS-3. Because (1) the track is the - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 8
ECG036/1297 7(&+12/2*< %5,() (cont'd) ... DDS-3's read-after-write (RAW) capability also improves the data transfer rate. RAW refers to the ability of a DDS drive to read and verify data immediately after it has been written. This is possible because of the extra set of read and write heads that - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 9
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 - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 10
GB DAT Drive. Figure 10: Compaq 12/24 GB DAT Drive being inserted into a ProLiant server. The 12/24 GB DAT Drive is designed with TapeAlert support. TapeAlert is a tape drive status monitoring and messaging utility that automatically detects media and drive problems that could have a negative impact - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 11
ECG036/1297 7(&+12/2*< %5,() (cont'd) ... Seagate Software Seagate Backup Exec® for Microsoft Windows NT, Novell NetWare 3.x and IntranetWare 4.0 all support the Compaq 12/24 GB DAT Drive. The Seagate software complements the 12/24 GB DAT Drive with advanced industry features, such as: • - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 12
Results: ProLiant 6000 with three Pentium Pro 200MHz processors, 512 K cache, 320 MB memory, one SMART-2 Array Controller, fourteen 4.3 GB ultra-wide SCSI drives Microsoft Windows NT 4.0 Cheyenne ARCserve 6.0 (Build 516) Compaq 12/24 GB DAT Version 2.86 512 MB of 1 MB files RAIT-0 Compression - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 13
drive RAIT level ProLiant 6000 with three Pentium Pro 200MHz processors, 512 K cache, 320 MB memory, one SMART-2 Array Controller, fourteen 4.3 GB ultra-wide SCSI drives Novell IntranetWare SMP Cheyenne ARCserve 6.1 Compaq 12/24 GB DAT Version 2.86 512 MB of 1 MB files RAIT-0 Results: Compression - HP ProLiant 4000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 14
RAIT level ProLiant 6000 with three Pentium Pro 200MHz processors, 512 K cache, 320 MB memory, one SMART-2 Array Controller, fourteen 4.3 GB ultra-wide SCSI drives Novell IntranetWare SMP Seagate Backup Exec version 7.0 Rev. 554a Compaq 12/24 GB DAT Version 2.86 512 MB of 1 MB files RAIT-0 Results
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C
ONTENTS
’’6²³´±(QKDQFLQJ±’$7±5HOLDELOLW\µ
&DSDFLW\µ±DQG±3HUIRUPDQFH
Mid-size businesses and branch offices using departmental servers with storage
requirements of 24 GB or less and running Microsoft Windows NT
®
, Novell
NetWare
®
3.x or IntranetWare
®
4.0 have a growing need for high performance, high
capacity, and reliable backup methods.
Digital Data Storage-3 (DDS-3) technology,
which is the recording format used by Digital Audio Tape (DAT) products, meets this
need with three times the capacity and twice the data transfer rate of DDS-2
technology and offers improved automated head cleaning mechanisms that enhance
backup reliability.
DDS-3 also provides low total cost of ownership for customers,
due to low-cost media and backward read/write compatibility with existing DDS-1
and DDS-2 media.
This brief discusses DDS-3 technology and the Compaq 12/24 gigabyte (GB) DAT
Drive, which is designed with DDS-3 technology.
Please direct comments regarding this communication to the ECG Technology Communications Group at this
Internet address: