Specifications
Fibre Channel Over IP
26 Continuous Access and Data Replication Manager SAN Extensions Reference Guide
Continuous Access EVA with VCS V3.025 support
Due to changes in the firmware introduced in VCS V3.025, the minimum network
supported bandwidths for the gateways have changed. At this time, Table 8 lists
the minimum quality of service requirements for the intersite network.
Table 9
through
Table 11 list by switch vendor the supported switch and gateway pairs
with the minimum supported network bandwidth and number of DR Groups.
The following gateways are qualified by HP for use with an EVA as FC routers
and/or iSCSI interfaces as indicated:
■ HP Multi-Protocol Router is qualified as a router.
■ C-series IPS8, IPS4, 14+2, MDS9216i are qualified as an FCIP and iSCSI
gateway; MDS9616i supported as an FC switch.
■ HP SR2122-2 is qualified as an iSCSI gateway.
All other gateways listed in Table 9 through Table 11 are only qualified for
interfacing FC to IP. Any other functions (FC switch, FC routing, and iSCSI) are
not supported even if available. A number of gateways contain an FC switch as
the interface to the fabric; only another supported switch may connect to these
ports.
Table 8: General intersite network requirements when using long distance
gateways with VCS 3.025
Bandwidth
1
1. Pre-existing restriction
Must be dedicated to the continuous access storage
replication function
Note: No support for dynamic pacing of the gateway
at this time.
Maximum # of DR Groups See Table 9 through Table 11 for specific minimum
supported bandwidth based on the average packet
loss ratio and the one-way intersite latencies
Maximum Transmission Unit
(MTU) of the IP network
Set to 1500 Bytes
Maximum Latency
1
100 mSec one way or 200 mSec round trip
Average Packet Loss Ratio
2
2. Packet loss ratio is an indication of the need to re-transmit data across the intersite link.
Each re-transmission delays the queue behind the current packet, increasing the time to
complete transactions in the queue.
0.2% averaged over 24 hours, not to exceed 0.5% for
more than 5 minutes within a 2 hour window
Latency Jitter
3
Not to exceed 10 mSec over 24 hours