Promise Technology E610f Bedienungsanleitung PDF herunterladen (Seite 5)

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Choosing a Suitable Topology

To support different VTL market segment requirements, the VTrak E610f offers two topology options for VTL: Direct

Attached Storage (DAS) and Storage Area Network (SAN). A DAS topology (shown in Figure 1) is a lower cost approach,

suitable for small to medium scale deployments. A SAN topology is massively scalable in terms of both capacity into the

petabyte range and of performance up to multiple terabytes per hour, for large-scale backup applications with stringent

backup window requirements. With both the DAS and SAN topologies, there are High Availability (HA) options that can be

configured at the storage (VTrak) and appliance (VTL) levels for meeting different application requirements.

DAS

Figure 1. DAS topology

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VTL Appliance A

VTL Appliance B

(Option for HA)

VTrak E610f

VTrak J610s

Expansion Unit(s)

In a DAS topology, the VTL applia

nces are

directly connected to the VTrak E610f through

their Fibre Channel ports.

TheVTrakE610fcanbeconnectedtoupto

fourPromiseVTrakJ610sexpansionunits.

HA Options for DAS

There are two levels of high availability options for meeting different application requirements.

Storage Level

The VTrak E610f supports dual controller modules, which offer fully redundant paths to the VTL appliance with no single

point of failure. As shown in Figure 1 above, each VTL appliance has two Fibre Channel ports, each of which can be

connected to one Fibre Channel port on each of the storage controllers.

Appliance Level

This HA option offers redundancy at the VTL appliance level for the VTL cluster. If one of the VTL appliances fails, the

other VTL appliance takes over the VTL requests from the backup clients without service interruption. In this case, an

optional VTL appliance could be installed with two Fibre Channel ports, each connected to the remaining Fibre Channel

port on each of the storage controllers.

Best Practices Guide 4

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Promise Technology E610f Bedienungsanleitung Seite 5