Compaq 108164-003 - ProLiant - 800 White Paper page 20

444A/0696
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HITE APER
(cont.)
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P P /166 E
ENTIUM RO
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Machine Class Compaq ProLiant 5000
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Processor Subsystem
1 Pentium Pro/166, 512 Kbyte L2 cache
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System Memory 128/ 256 Mbytes
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Disk Subsystem Integrated Fast Wide SCSI-2 controller
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PCI SMART-2 Controller
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Network Interface Compaq NetFlex/3 PCI (10BaseT)
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Operating System Windows NT Server v3.51 + SP4
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. . Table 9. Pentium Pro /166 Exchange Server hardware configuration
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. . In this case, the IS buffers were increased by adding 128 Mbytes of RAM to the configuration.
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Note that the entire additional 128 Mbytes of RAM are allocated to the IS buffer, i.e. the IS
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. . buffers were originally set to 9833 (39 MB), and they were increased to 42601 (167 MB). Each IS
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buffer is 4 Kbytes in size, so a net of 32768 buffers are added to allocate 128 Mbytes of RAM.
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. . Effect of increasing IS Buffer by 128 Mbytes
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4000
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3500
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3000
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2500
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2000
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1500
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1000
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. . 500
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0
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500
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Figure 9. Performance benefit of increasing IS buffers.
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The benefit of adding extra IS buffers produces significant benefit, especially at higher user
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levels. This is because the extra IS buffers are relieving the disk subsystem of a certain
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amount of the I/O load.
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20
S
XCHANGE ERVER HARDWARE CONFIGURATION
LoadSim Score vs. # Users
(lower score is better)
1000
Number of Users
Pagefile and executables volume : 1x2GB Fast Wide
SCSI-2 drive
Log volume : 2x2GB Fast SCSI-2 drives on port 0, RAID
1 (Array Accelerator enabled)
IS volume: 3x2GB Fast SCSI-2 drives on port 1, RAID 5
(Array Accelerator enabled)
1500
39 MB
167 MB