Compaq ProLiant 1000 DDS-3 Enhancing DAT Reliability, Capacity, and Performanc
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- Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 1
3HUIRUPDQFH Mid-size businesses and branch offices using departmental servers with storage (DDS-3) technology, which is the recording format used by Digital Audio Tape (DAT) products, meets this need with three DDS-3 technology and the Compaq 12/24 gigabyte (GB) DAT Drive, which is designed with DDS - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 2
COMPAQ HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. The limited warranties for Compaq were tested. The configuration or configurations tested or described Software. Other product names mentioned herein may be trademarks and/or registered trademarks of their respective companies. ©1997 Compaq - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 3
, small and mid-size businesses use departmental servers, such as the Compaq ProLiant 1200, ProLiant 1600, or ProLiant 2500 servers with storage requirements of 24 GB or less. To meet the needs of mid-size businesses, Compaq has an affordable line of DAT drives that use the DDS recording format - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 4
between signals 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 - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 5
positioning and seeking operations in disk and tape drives. This scheme relies on positioning data recorded on the media surface to generate correction 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 - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 6
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 user are equally-spaced "timing marks." By referencing from the edge of the tape, the drive is able to measure the time it takes to reach the timing mark - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 7
efficiency, and increased use of track space due in part to the change locate particular data on a tape. The sub-code areas include information about user data such as group count, filemark count, setmark count, and block count, which allows the drive to find a particular data group quickly. The tape - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 8
, which is used when the maximum number user maintenance requirements, reducing the frequency of cleaning by a conservative factor of four. Figure 7: DDS-3 head cleaner. Figure 8: DDS-3 head cleaner in DAT drive. 1 For information on cleaning DAT drives, please see white paper, Tape Drives - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 9
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 - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 10
of the Compaq 12/24 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 - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 11
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: • Intelligent disaster recovery • Dynamic drive pooling in the Windows NT environment • Fault tolerant - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 12
backup software Hardware Operating system Backup software Backup drive DAT drive firmware Data set per drive RAIT level 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 - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 13
Backup Exec software Hardware Operating system Backup software Backup drive DAT drive firmware Data set per 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 Microsoft Windows - Compaq ProLiant 1000 | DDS-3 Enhancing DAT Reliability, Capacity, and Performanc - Page 14
Backup Exec software Hardware Operating system Backup software Backup drive DAT drive firmware Data set per 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
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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: