HP ProLiant 4500 Disk Subsystem Performance and Scalability - Page 26

Table 10, Disk Controller Scaling Advantages and Disadvantages

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ECG025.0997 WHITE PAPER (cont.) ... Disk Controller Scaling (RAID 0) Server Throughput (Bytes/sec) 20,000,000 18,000,000 16,000,000 14,000,000 12,000,000 10,000,000 8,000,000 6,000,000 4,000,000 2,000,000 0 4 12 x 4GB, 1 Ctr 3% 12 x 4GB, 2 Ctr 8 16 20 24 28 32 36 40 44 48 52 56 57 Number of Clients Figure 14: Disk Controller Scaling in a RAID 0 Environment. Table 10 lists the advantages and disadvantages of disk controller scaling so that you may weigh each and decide what is right for your environment. Table 10: Disk Controller Scaling Advantages and Disadvantages Advantages Disadvantages Eliminates idle time on the controller by minimizing the time the disk subsystem has to wait to receive data. By adding multiple controllers to your system you have more devices to manage. Increases disk capacity by using up to 14 drives per controller. Purchasing multiple controllers adds to the overall cost of your system. Increases cumulative transfer rate because multiple controllers added to your system mean more data can be transferred. Doubles the amount of cache on the disk controller. 26

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Disk Controller Scaling (RAID 0)
0
2,000,000
4,000,000
6,000,000
8,000,000
10,000,000
12,000,000
14,000,000
16,000,000
18,000,000
20,000,000
4
8
16
20
24
28
32
36
40
44
48
52
56
57
Number of Clients
Server Throughput (Bytes/sec)
12 x 4GB, 1 Ctr
12 x 4GB, 2 Ctr
3%
Figure 14: Disk Controller Scaling in a RAID 0 Environment.
Table 10 lists the advantages and disadvantages of disk controller scaling so that you
may weigh each and decide what is right for your environment.
Table 10:
Disk Controller Scaling Advantages and Disadvantages
Advantages
Disadvantages
Eliminates idle time on the controller by
minimizing the time the disk subsystem has
to wait to receive data.
By adding multiple controllers to your system you have more
devices to manage.
Increases disk capacity by using up to 14
drives per controller.
Purchasing multiple controllers adds to the overall cost of
your system.
Increases cumulative transfer rate because
multiple controllers added to your system
mean more data can be transferred.
Doubles the amount of cache on the
disk controller.