Throughput
10
Figure 6 PCI-X Fibre Channel Write Performance
Figure 6 shows PCI-X Fibre Channel Write (Wr) performance. With 1, 2, or 4 cells
configured, the following throughput rates were achieved:
• Write throughput on the FC port with no GigE traffic on a 1 cell partition is an excellent
184 MBytes/sec. As the partition size is increased by adding up to 3 more cells, write
throughput decreases to 168 MBytes/sec. A similar pattern emerges when FC write and
GigE bidirectional are combined. FC write throughput is 160 MBytes/sec on a 1 cell
partition and decreases to 143 MBytes/sec as partition size is increased to 4 cells.
• When tested in a PCI-66 slot, the performance results for write only throughput showed
no decrease in performance when compared to PCI-X. When FC write and GigE
bidirectional traffic are combined, PCI-66 performance is 117 MBytes/sec. As you
increase the partition size by adding up to 3 more cells, write throughput decreases to
90 MBytes/sec. The decreased performance seen when both ports are active on the
A9782A/A9784A is a result of the bandwidth limitation of the PCI-66 technology and
is not due to a limitation in the adapter.
184
160
169
145
168
143
0
20
40
60
80
100
120
140
160
180
200
Wr Wr + GigE BD
MBytes/sec
1 Cell
2 Cells
4 Cells
To Next Page
Loading...
Need help?
General