Compaq ProLiant 6000 Performance of Microsoft Exchange Server 5.0 on Compaq Pr - Page 14

Effect of Number of Spindles

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ECG052.0897 WHITE PAPER (cont.) 1...4 Disk Subsystem Effect of Number of Spindles The basic idea with a disk subsystem is to provide the highest level of disk I/O possible to meet the application's requirements. One way to do this is to have many spindles (disks) connected to a Compaq SMART-2 Array Controller and employ multiple controllers. Each SMART-2 Controller can support up to fourteen drives across two Wide-Ultra SCSI channels. The SMART-2SL, however, supports a maximum of seven drives on a single Wide-Ultra SCSI channel. If each disk supports an average of 55 Random I/Os per second, a single SMART-2 Array Controller can deliver approximately 770 Random I/Os per second. For Sequential I/O, more than 2000 I/Os per second is possible (assuming approximately 150 sequential I/Os per second per drive). Additional information helpful for capacity planning and sizing of client/server applications such as Microsoft Exchange Server is available in the following Compaq white papers: • SMART-2 Array Controller Technology (Document number 317A/0797) • Configuring Compaq RAID Technology for Database Servers (Part number 184206-001) • Configuration and Tuning of Microsoft SQL Server 6.5 on Compaq Servers (Document number 415A/0696) The concepts discussed in these white papers are applicable to Microsoft Exchange Server. Microsoft Exchange is a high-transaction-throughput database engine based on Microsoft's Joint Engine Technology (JET). Many generic techniques and recommendations for tuning of database environments can be successfully applied to Microsoft Exchange Server. For example, the separation of sequential (for example, Log and Pagefile) I/O operations from random (for example, database access) I/O operations is an important optimization technique for both Microsoft SQL Server and Microsoft Exchange Server. 14 12 10 8 6 4 2 0 500 Disk Queue Length (HW Configuration A) 1000 1500 2000 User Load 2500 3000 Exchange IS Exchange LOG OS/Pagef ile Figure 4. Disk Queue Length (Configuration A)

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W
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APER
(cont.)
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Disk Subsystem
Effect of Number of Spindles
The basic idea with a disk subsystem is to provide the highest level of disk I/O possible to meet
the application’s requirements. One way to do this is to have many spindles (disks) connected to a
Compaq SMART-2 Array Controller and employ multiple controllers. Each SMART-2 Controller
can support up to fourteen drives across two Wide-Ultra SCSI channels. The SMART-2SL,
however, supports a maximum of seven drives on a single Wide-Ultra SCSI channel. If each disk
supports an average of 55 Random I/Os per second, a single SMART-2 Array Controller can
deliver approximately 770 Random I/Os per second. For Sequential I/O, more than 2000 I/Os per
second is possible (assuming approximately 150 sequential I/Os per second per drive).
Additional information helpful for capacity planning and sizing of client/server applications such
as Microsoft Exchange Server is available in the following Compaq white papers:
•
SMART-2 Array Controller Technology (Document number 317A/0797)
•
Configuring Compaq RAID Technology for Database Servers (Part number 184206-001)
•
Configuration and Tuning of Microsoft SQL Server 6.5 on Compaq Servers (Document
number 415A/0696)
The concepts discussed in these white papers are applicable to Microsoft Exchange Server.
Microsoft Exchange is a high-transaction-throughput database engine based on Microsoft’s
Joint
Engine Technology
(JET). Many generic techniques and recommendations for tuning of database
environments can be successfully applied to Microsoft Exchange Server. For example, the
separation of sequential (for example, Log and Pagefile) I/O operations from random (for
example, database access) I/O operations is an important optimization technique for both
Microsoft SQL Server and Microsoft Exchange Server.
Figure 4. Disk Queue Length (Configuration A)
Disk Queue Length
(HW Configuration A)
0
2
4
6
8
10
12
14
500
1000
1500
2000
2500
3000
User Load
Exchange IS
Exchange LOG
OS/Pagef ile