.Part 4 SAN Extension and Bridging HP SAN Design Reference Guide 785354-001

Table 151 Network requirements for long-distance IP gateways with VCS 4. x (continued)
DescriptionSpecification
High-loss network: 0.2% average over 24 hours; must not exceed 0.5% for
more than 5 minutes in a two-hour window
Must not exceed 10 ms over 24 hours
Latency jitter
3
1
Pre-existing restriction
2
A high packet-loss ratio indicates the need to retransmit data across the inter-site link. Each retransmission delays
transmissions queued behind the current packet, thus increasing the time to complete pending transactions. Unless noted
otherwise, gateways listed in Table 152 (page 303) and Table 153 (page 304) are supported in both low-loss and high-loss
networks.
3
Latency jitter is the difference between the minimum and maximum values, and indicates how stable or predictable the
network delay. The greater the jitter, the greater the variance in the delay, which lowers the performance predictability.
NOTE: Applications typically require more than the minimum bandwidth to meet throughput
requirements. To increase the maximum number of DR groups, you must increase the minimum
available IP bandwidth. For example, if the maximum number of DR groups required is 10, increase
the minimum available bandwidth to 10 Mb/s; for 15 DR groups, increase to 15 Mb/s; and for
128 DR groups, increase the minimum available bandwidth to 128 Mb/s.
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