HP ProLiant 2000 DDS-3 Enhancing DAT Reliability, Capacity, and Performance
HP ProLiant 2000 Manual
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- HP ProLiant 2000 | 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 2000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 2
This test is not a determination of product quality or correctness, nor does it ensure compliance with any federal, state or local requirements. Compaq is registered with the United States Patent and Trademark Office. Microsoft and Windows NT are trademarks and/or registered trademarks of Microsoft - HP ProLiant 2000 | 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 2000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 4
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 Drive (DDS - HP ProLiant 2000 | 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 2000 | 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 2000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 7
ECG036/1297 7(&+12/2*< %5,() (cont'd) ... Other ways DDS-3 technology increases track space are by compressing sub-code information into less space and by packing user data into fewer, larger blocks, thereby reducing total overhead for data blocks. As a result of the increased linear bit density, - HP ProLiant 2000 | 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 2000 | 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 2000 | 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 2000 | 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 2000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 12
DAT drive firmware Data set per drive RAIT level Results: ProLiant 6000 with three Pentium Pro 200MHz processors, 512 K cache, 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 Ratio - HP ProLiant 2000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 13
Backup drive DAT drive firmware Data set per drive RAIT level ProLiant 6000 with three Pentium Pro 200MHz processors, 512 K cache, 320 ultra-wide SCSI drives Microsoft Windows NT 4.0 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: - HP ProLiant 2000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performance - Page 14
Backup drive DAT drive firmware Data set per drive RAIT level ProLiant 6000 with three Pentium Pro 200MHz processors, 512 K cache, 320 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: