San Extension Best Practices For Continuous Access Eva; Continuous Access Eva4400/6400/8400 With Xcs 09X - HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays Reference Manual

OpenVMS host-based volume shadowing
The following products are qualified by HP as Fibre Channel routers, network gateways, or iSCSI
bridges with the EVA storage system:
1606 Extension SAN Switch, DC Dir Switch MP Extension Blade, 400 MP Router, MP Router
Blade, and MP Router are qualified as FCIP gateways and Fibre Channel routers. The 1606 Ex-
tension SAN Switch, DC Dir Switch MP Extension Blade, 400 MP Router, and MP Router Blade
are also qualified as Fibre Channel switches.
C-series IP Storage Services Modules (IPS-4, IPS-8), 14/2 Multiprotocol Services Module, MDS
9216i, and MDS 9222i switches are qualified as an FCIP gateway and an iSCSI bridge. MDS
9216i and MDS 9222i switches are also qualified as Fibre Channel switches.
MPX200 Multifunction Router is qualified as an FCIP gateway.
HP IP Distance Gateway is qualified as an FCIP gateway.
The following sections describe network requirements for replication products with qualified gateways:
SAN extension best practices for Continuous Access
Continuous Access EVA4400/6400/8400 with XCS
Continuous Access EVA with XCS
Continuous Access EVA with VCS
Continuous Access
OpenVMS host-based volume

SAN extension best practices for Continuous Access EVA

HP recommends you consider the following best practices when implementing SAN extension using
FCIP with Continuous Access EVA:
Separate host traffic from replication traffic in environments that employ FCIP gateways. This de-
couples the host I/O from throughput on the inter-site link. This can be achieved in the following
ways:
Use separate switches and separate fabrics for host and replication I/O (preferred solution).
Replication zones can be set up through fabric zoning. Using standard fabric zoning, the host
traffic is separated from the replication traffic.
For high availability and no single point of failure, the best practice is to deploy a 6-fabric solution,
where there are two inter-site links. This solution uses separate switches for the replication and
host fabrics. At least one of the EVAs must be an EVA8x00. Two fabrics that are dedicated to
replication and four fabrics are dedicated to host I/O traffic.
If only a single ISL is available, then a 5-fabric configuration can be used. This solution requires
using separate switches for the host and replication fabrics. Only one fabric would be dedicated
to replication traffic.
Use a 2-fabric (dual fabric) configuration only if the host traffic cannot be separated from the
replication traffic. This is recommended only when the customer business requirements permit it.
Take care when designing a 2-fabric configuration over FCIP links, as host port blocking can occur.
For more information on the different fabric configurations, see the HP StorageWorks Continuous
Access EVA Planning Guide.

Continuous Access EVA4400/6400/8400 with XCS 09x

This section describes the Continuous Access EVA4400/6400/8400 XCS 09x data replication
specifications and the supported minimum and maximum transmission rates for qualified switch and
324 SAN extension
6x, page 328
4.x, page 332
XP, page 335
shadowing, page 352
EVA, page 324
09x, page 324