HP IP Distance Gateway - Manual (Page 24)

Table 2 Network requirements for the mpx110 with XCS and VCS
Description Specification
Must be dedicated to the HP Continuous Access storage replication function.
There is no support for dynamic pacing of the gateway. Bandwidth
1
See Table 1 (page 22) for minimum supported bandwidth based on the
average packet-loss ratio and one-way intersite latencies.
Maximum number of DR groups
1,500 bytes MTU of the IP network
P6000/EVA: 100 ms one-way or 200 ms round-tripP9000/XP: 50 ms one-way
or 100 ms round-trip Maximum latency
1
Low-loss network: 0.0012% average over 24 hoursHigh-loss network: 0.2%
average over 24 hours; must not exceed 0.5% for more than 5 minutes in a
2-hour window Average packet-loss ratio
2
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 intersite link. Each retransmission delays
transmissions queued behind the current packet, thus increasing the time to complete pending transactions.
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.
24 Configuration rules and guidelines