Euro currency symbol on compaq tower and rack server keyboards (8 pages)
Summary of Contents for Compaq 312134-B21 - Intel Pentium II Xeon Processor Board
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DLT Tape Array II, which uses 35/70 GB DLT drives, sets new standards in high-speed backup performance. Early in 1997, Compaq performed a series of tests to examine the performance of the Compaq 35/70 GB DLT drive and the DLT Tape Array II. The objective of these tests was to find the highest-performance configurations in a variety of backup scenarios on Compaq servers running Windows NT and Novell IntranetWare network operating systems.
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INTERRUPTION OR LOSS OF BUSINESS INFORMATION), EVEN IF COMPAQ HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. The limited warranties 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.
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With the size of data sets and databases approaching and exceeding the terabyte mark, customers require improved performance for large backups. The chart below illustrates typical peak server backup speeds for the last five years. Today, Compaq passes 165 gigabytes per hour (GB/hr) with off-the-shelf technology.
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The tape technology selected to perform the backup. In the tests, the system that provided optimum performance consisted of a Compaq ProLiant 6000 with four or eight drives in a DLT Tape Array II, which was fed data from a pair of Compaq SMART-2/P Array Controllers and associated SCSI disk drives.
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(up to three times faster) clinched the decision to use it for high-speed backup testing. The 32- bit x 33 MHz PCI bus peaked at 454 GB/hr in load tests with six Compaq SMART-2/P Array Controllers. To maximize bandwidth, tests were also performed to determine optimum card placement in the dual PCI bus system of the ProLiant 5000 and ProLiant 6000.
Tests were performed with an assortment of narrow and wide drives ranging in size from 2 to 9 gigabytes (GB). Superior performance was seen on the Compaq Fast-Wide 2 GB, 4 GB and 9 GB drives. See Test 12 for more information.
Nevertheless, it permits random access to the files for faster retrieval of individual files. Both methods were included in Compaq’s testing scenarios. It should be noted that some image backup programs (notably Cheyenne ARCserve for NT) have the ability do a by file restore from an image backup, but using that functionality usually extends the restore operation time significantly.
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4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To observe the performance of various numbers of tape drives in relation to various numbers of SCSI cards under Windows NT 4.0. Of the configurations tested, two SCSI cards driving two 35/70 GB DLT drives offer the fastest speed.
(cont.) DLT Tape Array II GB/hr 1 to 1 1 to 2 2 to 2 2 to 4 4 to 4 Image Backup Image Restore By File Backup By File Restore Figure 6: Performance results from tests comparing various proportions of 53c875 SCSI cards to DLT drives (shown at the bases of the columns).
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4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To observe the performance of various numbers of tape drives in relation to various numbers of SCSI cards under Novell IntranetWare 4.11 on a very high-performance backup server configuration.
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(cont.) DLT Tape Array II GB/hr Backup Restore Figure 7: Performance of IntranetWare backups and restores by numbers of SCSI cards in relation to numbers of tape drives (shown at the bases of the columns). 31.61 31.32 61.94 53.38 92.61 79.12 121.78 58.42...
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35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) The initial purpose of this test was to find the fastest backup solution using Cheyenne JETserve and to examine performance variables. Long after this set of tests was performed, it was discovered that the addition of two SMART-2/P Array controllers and disk drives dramatically improved performance.
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(cont.) DLT Tape Array II GB/hr Backup Restore Figure 8: High-performance backup and restore under Novell IntranetWare with different proportions of SCSI cards to tape drives (shown at the bases of the columns). *Hardware compression turned off. **This test used 4:1 compression; all others, 2:1 compression. 29.03 29.49 55.81...
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35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To determine the highest performance configuration for an image backup to DLT drive or RAIT-0 group of drives (RAIT-0 is not significant when using one drive). The test consisted of running a single job to back up a 2 GB file set to various numbers of DLT drives (from one to eight).
(cont.) DLT Tape Array II 45.0 40.0 35.0 30.0 25.0 GB/hr 20.0 15.0 10.0 Restore Backup Figure 9: Local backup and restore performance under Windows NT with various proportions of SCSI cards and 35/70 GB DLT drives (shown at bases of columns). 30.1 14.2 41.1...
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(cont.) DLT Tape Array II The following test results are included to demonstrate the performance increase achieved when using even larger systems with faster feed speeds. These tests differ only in that a ProLiant 6000 was used, with three Pentium Pro processors and two additional SMART-2/P Controllers with 56 drives.
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To show what effect multiple tape drives would have, a large variety of situations were tested. In all cases, the Compaq Array Configuration Utility was used to configure the Compaq disk drive arrays. To join multiple disk array groups between adapter groupings, Windows NT Disk Administrator was used to group these as one striped drive.
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(cont.) DLT Tape Array II GB/hr 1 Job 2 Jobs 4 Jobs 8 Jobs Data Compression Figure 11: Concurrent backup performance running Cheyenne ARCserve 6.0 (image option) under Windows NT. Jobs SCSI DLTs RAIT Smart Cards Drives 2:1 Backup 4:1 Backup Cards Level per Job...
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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.
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(cont.) DLT Tape Array II Data compression is an important factor in backup speeds, and in most cases, it is not something the customer can control. In investigations into real customer data set composition, it was found that most servers contain data with a compressibility between 2:1 and 4:1. The backup speed for non-compressible data highlights the advantage of the data compression hardware built into the drive: The 2:1 data backed up nearly twice as fast as data backed up with the tape drive compression feature turned off.
35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To determine the impact of RAIT-5 as it relates to processor performance and throughput, to discover how much CPU power is required to perform the RAIT-5 calculations, and to find out whether this overhead will seriously affect backup times.
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(cont.) DLT Tape Array II GB/hr 2-4, 2:1 4-4, 2:1 2-4, 4:1 4-4, 4:1 RAIT-5 (CPU use = 41%) RAIT-0 (CPU use = 7%) Figure 13: RAIT-5 and RAIT-0 performance with various proportions of cards to drives and two compression ratios (shown at bases of columns). 56.16 59.88 48.66...
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80-GB array (two SMART-2/P Array Controllers with twenty 4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) 10TX – Ethernet over CAT-5 cable through a simple hub 100TX – Ethernet over CAT-5 cable through a simple hub All tests used TCP/IP protocol.
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SMART-2 = SMART-2 Hard Disk Controller Figure 14: A typical backup configuration for a large network system using Compaq DLT Tape Array and DLT Library solutions. Such a system can have more than 250 GB of space available for typical server applications.
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4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) 10/100TX – Ethernet over CAT-5 cable through simple hub TCP/IP protocol To test the throughput of a multiple server backup over a single network connection.
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(cont.) DLT Tape Array II GB/hr Figure 15: Results of backups performed with Windows NT Server pulling from IntranetWare. 10TX 10TX 100TX 19.0 100TX 21.1 100 TX 2 (2 clients) 25.5 100TX 4 (4 clients) 32.4 Table 10: Test data for Windows NT Server pulling from an IntranetWare remote client. ECG075.0997...
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The tapes were verified and there was no data loss at any point. This test was performed on the Max-Storage system in the Compaq Maximum Configuration Lab. The lab has multiple ProLiant 6000 systems with FC-AL storage systems. These FC-AL storage systems use 1-gigabit fiber optic links to connect large (2.5 to 3.5 terabytes) disk arrays...
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(cont.) DLT Tape Array II Fibre Arrays Loop Expansion 6 per LEM Modules 1 - 6 Fibre Host Controllers 1 - 6 Redundant Fans Wide-Ultra SCSI-3 Adapters 1 & 2 Network Adapter Power Power Suppy Suppy File storage capacity: 2.6 terabytes 6 x 6 x (8 x 9.1 GB) ~ 2.6 terabytes Tape storage capacity: 140 GB native, 280 GB compressed...
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35/70 GB DLT drive(s) Wide-Ultra SCSI-3 Cards (All Compaq off-the-shelf products) To demonstrate the relationship of feed speed to backup speed. Single and multiple job tests were performed to demonstrate the relationship of bandwidth to bottlenecks within the...
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(cont.) DLT Tape Array II Test A Perform baseline analysis using Cheyenne’s RAWREAD.EXE to obtain ratings of drive performance. Test B Perform a backup of a 2-GB data set per drive. This single job image backup to DLT Array II with four 35/70 GB DLT drives (driven by two Wide-Ultra SCSI-3/PCI cards) was written at RAIT-0.
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(cont.) DLT Tape Array II The results clearly show this performance relationship: The faster the drive system, the faster the backup. Test B shows backup performance can be almost tripled (from 30 to 84.5 GB/hr) with hardware that provides data to the tape drives fast enough. Test C demonstrates that performance can be increased with multiple jobs, but only with adequate feed speed.
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The DLT Tape Array II sets new standards in high-speed backup performance. The tests documented in this brief demonstrate that Compaq delivers very high speed backup solutions for an assortment of server environments, with the ability to back up data at speeds exceeding 150 GB/hr.
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OMPAQ RIVE The cables provided with the various Compaq option kits are of very high quality. If they are ever damaged, replace them with identical Compaq parts. SCSI data transfers will operate poorly (or not at all) when signal conditions are degraded due to low-quality cabling.
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(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.
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(cont.) DLT Tape Array II PPENDIX NSTALLATION OTES FOR THE OMPAQ RRAY The Model 4 DLT Tape Array II comes with: Rack-mountable array cabinet with internal power supply. Four internally-mounted 35/70 GB DLT drives. Four DLT data cartridges. One DLT cleaning tape. Two internal SCSI cables.
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TANDARD ERFORMANCE PEED ACKUP YSTEMS Compaq ProLiant 5000 and ProLiant 6000 with dual peer PCI bus system architecture Two Intel Pentium Pro processors with 256K L2 cache 256-MB ECC DIMMs Compaq SMART-2/P Array Controller(s) Two SMART-2/P Array Controllers feeding four channels, with a total of 24 drives Compaq 4.3-GB Pluggable 1”...
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