Compaq ProLiant 1000 Performance of Microsoft Exchange Server 4.0 on Compaq Pr - Page 15

Pentium Pro/166

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444A/0696 WHITE PAPER (cont.) 1...5 • In this data there is not the huge jump in Score as exhibited by the Pentium/100. This is possibly because the L2 cache is not being overrun at these user loads. • This example shows how there is little benefit in adding a CPU when the system insot processor constrained. In the case of going from 1P to 2P the response time improves very little until the number of users exceeds 1000. Interestingly, there is no real apparent bottleneck in the server hardware itself. The gradual slowdown could be due to the Exchange software itself. • For systems on which the workload is light (refer to Table 1 for workload comparisons), there is a tradeoff in adding CPUs to the processor subsystem due to system overhead. System requests and context switches increase substantially as more CPUs are added. This could also account for the marginal benefit in adding a second CPU, i.e. in this case the benefit could be offset by the additional overhead. • This data implies that the system would be able to handle other tasks besides the email and public folder tasks in theLoadSim user profile. For example, the second CPU would likely be used more effectively if a gateway or some other Exchange process is added to the system. • Four CPU data is omitted because it provides no additional benefit in this scenario. Pentium Pro/166 PENTIUM PRO/166 EXCHANGE SERVER HARDWARE CONFIGURATION Machine Class Compaq ProLiant 5000 Processor Subsystem One Pentium Pro/166, 512 Kbyte L2 cache System Memory 128 Mbytes Disk Subsystem Integrated Fast Wide SCSI-2 controller Pagefile and executables volum:e1x2GB Fast Wide SCSI-2 drive PCI SMART-2 Controller Log volume: 2x2GB Fast SCSI-2 drives on port 0, RAID 1 (Array Accelerator enabled) IS volume: 7x2GB Fast SCSI-2 drives on port 1, RAID 5 (Array Accelerator enabled) Network Interface Compaq NetFlex/3 PCI (10BaseT) Operating System Windows NT Server v3.51 + SP4 Table 7. Pentium Pro /166 Exchange Server hardware configuration

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W
HITE
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APER
(cont.)
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•
In this data there is not the huge jump in Score as exhibited by the Pentium/100. This is
possibly because the L2 cache is not being overrun at these user loads.
•
This example shows how there is little benefit in adding a CPU when the system is
not
processor constrained. In the case of going from 1P to 2P the response time improves very
little until the number of users exceeds 1000. Interestingly, there is no real apparent
bottleneck in the server hardware itself. The gradual slowdown could be due to the Exchange
software itself.
•
For systems on which the workload is light (refer to Table 1 for workload comparisons), there
is a tradeoff in adding CPUs to the processor subsystem due to system overhead. System
requests and context switches increase substantially as more CPUs are added. This could also
account for the marginal benefit in adding a second CPU, i.e. in this case the benefit could be
offset by the additional overhead.
•
This data implies that the system would be able to handle other tasks besides the email and
public folder tasks in theLoadSim user profile. For example, the second CPU would likely be
used more effectively if a gateway or some other Exchange process is added to the system.
•
Four CPU data is omitted because it provides no additional benefit in this scenario.
Pentium Pro/166
P
ENTIUM
P
RO
/166 E
XCHANGE
S
ERVER HARDWARE CONFIGURATION
Machine Class
Compaq ProLiant 5000
Processor Subsystem
One Pentium Pro/166,
512 Kbyte L2 cache
System Memory
128 Mbytes
Disk Subsystem
Integrated Fast Wide SCSI-2 controller
Pagefile and executables volume
: 1x2GB Fast Wide
SCSI-2 drive
PCI SMART-2 Controller
Log volume
: 2x2GB Fast SCSI-2 drives on port 0, RAID 1
(Array Accelerator enabled)
IS volume
: 7x2GB Fast SCSI-2 drives on port 1, RAID 5
(Array Accelerator enabled)
Network Interface
Compaq NetFlex/3 PCI (10BaseT)
Operating System
Windows NT Server v3.51 + SP4
Table 7. Pentium Pro /166 Exchange Server hardware configuration