Compaq 312134-B21 Compaq DLT Tape Array II: High-Performance Backup of Enterpr
Compaq 312134-B21 - Intel Pentium II Xeon Processor Board Manual
UPC - 743172589668
View all Compaq 312134-B21 manuals
Add to My Manuals
Save this manual to your list of manuals |
Compaq 312134-B21 manual content summary:
- Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 1
. This brief addresses the technical aspects of highperformance backups that can reach and exceed 165 gigabytes per hour (GB/hr) with off-theshelf Compaq hardware. GB/hr 180 160 140 120 100 80 60 40 20 0 Network Backup One 100TX Ethernet connection. Four concurrent backups from four - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 2
and ProLiant are registered with the United States Patent and Trademark Office. Netelligent is a trademark and/or service mark of Compaq Computer Corporation. Microsoft, Windows, and Windows NT are trademarks and/or registered trademarks of Microsoft Corporation. NetWare and Novell are registered - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 3
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. GB/hr 170 160 150 140 130 120 110 100 90 80 70 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 4
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. This configuration worked very well for Novell IntranetWare and Microsoft Windows NT network operating systems. Test results - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 5
significantly reduce feed speed. Future testing will address this problem and explore other ways to improve network-based backups. 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 6
use. On the other hand, an array controller can often deliver the maximum limit of performance that the PCI bus can deliver: 133 MB/s. The Compaq SMART-2/P Array Controller is the best choice. It has two channels, and a minimum of four drives per channel should be used for high performance. If - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 7
is saved with each file. 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 8
cache, 256 MB RAM 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) To observe the performance of various numbers of tape drives in relation to various numbers of SCSI cards under Windows NT - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 9
ECG075.0997 (cont.) DLT Tape Array II ... 60 50 40 GB/hr 30 20 10 0 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 10
384 MB RAM 224-GB array (four SMART-2/P Array Controllers with fifty-six 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 11
and decompression times vary with file content and have different effects on CPU use. Another influence on restore speed is the rate at which the target can receive and write data. The use of large, multi-megabyte caches on disk drive arrays occasionally allows restore speeds to exceed backup speeds - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 12
, 256 MB RAM 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) The initial purpose of this test was to find the fastest backup solution using Cheyenne JETserve and to examine performance variables - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 13
ECG075.0997 (cont.) DLT Tape Array II ... 120 100 80 GB/hr 60 40 20 0 1 to 1 1 to 2 2 to 2 2 to 3 2 to 4 2 to 4* 2 to 4** 3 to 3 3 to 6 4 to 4 4 to 8 Backup Restore Figure 8: High-performance backup and restore under Novell IntranetWare with different proportions of SCSI cards to tape drives ( - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 14
SMART-2/P Array Controller with ten 4-GB drives) 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 the data, making the restore data flow more consistently to the target. - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 15
ECG075.0997 (cont.) DLT Tape Array II ... 45.0 40.0 35.0 30.0 25.0 GB/hr 20.0 15.0 10.0 5.0 0.0 1 to 1 1 to 2 2 to 2 2 to 4 4 to 4 4 to 8 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 16
ECG075.0997 (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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 17
MB RAM 224 GB array (four SMART-2/P Array Controllers with fifty-six 4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To determine whether throughput can be improved by performing concurrent backups on multiple drives. To show what effect multiple tape - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 18
ECG075.0997 (cont.) DLT Tape Array II ... 180 160 140 120 100 GB/hr 80 60 40 20 0 1 Job 2 Jobs 4 Jobs Data Compression 2:1 4:1 8 Jobs Figure 11: Concurrent backup performance running Cheyenne ARCserve 6.0 (image option) under Windows NT. Jobs SCSI Cards 1 4 2 1 2 2 2 2 2 4 2 4 4 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 19
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 four DLT Library units (each with two tape drives). This will support eight simultaneous backup jobs from eight network-connected remote servers or systems. - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 20
ECG075.0997 (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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 21
4-GB drives) 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 -5 over RAIT-0 (7 percent versus 41 percent), which could be a problem with concurrent backups or backups made during heavy server activity. The impact of - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 22
ECG075.0997 (cont.) DLT Tape Array II ... 70 GB/hr 60 50 40 30 20 10 0 2-4, 2:1 4-4, 2:1 2-4, 4:1 RAIT-5 (CPU use = 41%) RAIT-0 (CPU use = 7%) 4-4, 4:1 Figure 13: RAIT-5 and RAIT-0 performance with various proportions of cards to drives and two compression ratios (shown at bases of columns - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 23
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 the maximum rate at which the target drive can accept and write data on a continuous basis (or stream), the target drive drops out of write mode, - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 24
Dual 10/100 TX PCI UTP Controlle 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. With the - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 25
twenty 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 to the limits of the tape drives. IntranetWare client agent did not support multiple streams to the Windows NT backup server. The reverse test, - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 26
ECG075.0997 (cont.) DLT Tape Array II ... 35 30 25 20 GB/hr 15 10 5 0 A B C D E F Figure 15: Results of backups performed with Windows NT Server pulling from IntranetWare. A 10TX No 1 1 3.6 B 10TX Yes 1 1 3.9 C 100TX No 1 1 19.0 D 100TX Yes 1 1 21.1 E 100 TX - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 27
AL drive array 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To determine whether the DLT Tape Array II and its 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 28
ECG075.0997 (cont.) DLT Tape Array II ... Fibre Host Controllers 1 - 6 Wide-Ultra SCSI-3 Adapters 1 & 2 Network Adapter Loop Expansion Modules 1 - 6 RAID-Controller RAID-Controller Fibre Arrays 6 per LEM Redundant Fans 3 2 1 0 `` 3 2 1 0 Power Suppy Power Suppy File storage - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 29
256 K cache, 256 MB RAM Embedded or SMART-2/P SCSI (53C825) Controller (see details below) 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 30
ECG075.0997 (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- - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 31
ECG075.0997 (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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 32
II ... CONCLUSION 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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 33
quality. If they are ever damaged, replace them with identical Compaq parts. SCSI data transfers will operate poorly (or not at SCSI controller to drive a single 35/70 GB DLT drive, ensure that it is a Compaq 32-bit Fast-Wide controller or install a 32-bit Fast-Wide SCSI card to improve performance - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 34
ECG075.0997 (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 - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 35
(cont.) DLT Tape Array II ... APPENDIX 2: INSTALLATION NOTES FOR THE COMPAQ DLT TAPE ARRAY II The Model 4 DLT Tape Array II comes with -inch rack by following the directions in the installation guide. Do not take any shortcuts. Use all the hardware provided to ensure a safe and reliable system. - Compaq 312134-B21 | Compaq DLT Tape Array II: High-Performance Backup of Enterpr - Page 36
Array Controllers feeding four channels, with a total of 24 drives Compaq 4.3-GB Pluggable 1" Wide-Ultra SCSI-3 Compaq Wide-Ultra SCSI Controller (PCI) Compaq Netelligent 10/100MB/s TX PCI Ethernet Controller Compaq DLT Tape Array II using Compaq 35/70 GB DLT drives Windows NT 4.0 Build 1381 Novell
7
(&+12/2*<±
%
5,()
ECG075.0997
C
ONTENTS
&RPSDT±’/7±7DSH±$UUD\±,,²
+LJK³3HUIRUPDQFH±%DFNXS±RI±(QWHUSULVH
6HUYHUV
E
XECUTIVE
S
UMMARY
Since its introduction in February, 1996, the Compaq DLT Tape Array (which uses Compaq
15/30 GB DLT drives) has been an industry leader in backup performance capabilities. The
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.
The Compaq DLT Tape Array II provides high-capacity, high-speed tape storage for use in
local and remote backup strategies. It uses the Compaq 35/70 GB DLT drive, which is
engineered for superior performance. This brief addresses the technical aspects of high-
performance backups that can reach and exceed 165 gigabytes per hour (GB/hr) with off-the-
shelf Compaq hardware.
0
20
40
60
80
100
120
140
160
180
Network Backup
Local Backup:
Novell IntranetWare
Local Backup:
Windows NT
GB/hr
One 100TX Ethernet
connection. Four
concurrent backups
from four clients to
four tape drives
(Test 9).
One backup to
eight tape drives
(Test 2).
Eight concurrent
backups to eight
tape drives
(Test 5).
Figure 1: Maximum results in each backup scenario tested.
Please direct comments regarding this communication to the ECG Technology Communications Group at this Internet
address:
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.