HP 2G Using Manual page 10

Throughput
Figure 6 PCI-X Fibre Channel Write Performance
2 0 0
1 8 0
1 6 0
1 4 0
1 2 0
1 0 0
184
8 0
6 0
4 0
2 0
0
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.
10
169
168
W r
160
145
143
W r + Gig E B D
1 Cell
2 Cells
4 Cells