Continuous Access Svsp V2.1; Svsp V2.1 Inter-Site Network Requirements For Long Distance Gateways - HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays Reference Manual

Continuous Access SVSP V2.1

This section describes the Continuous Access SVSP V2.1 asynchronous data replication specifications
and the supported minimum and maximum transmission rates when using the SVSP VSM servers.
Table 137 lists the minimum network QoS requirements when using SVSP V2.1.
Table 137 SVSP v2.1 inter-site network requirements for long distance gateways
Bandwidth
MTU of the IP network
Maximum latency
Average packet-loss ratio
3
Latency jitter
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.
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 or initial full
copy requirements. For example, at 10 Mb/s it, could take up to two weeks to copy 1 TB of data,
longer if the average available bandwidth is less than 10 Mb/s.
274 SAN Virtualization Services Platform
Specification
1
2
Description
Can be shared, but doing so may prevent you from
performing replication
1,500 bytes
150 ms IP network delay one-way or 300 ms round-
trip
Must not exceed 0.5% averaged over a 5-minute
window
Must not exceed plus or minus 10% over a 5-minute
window