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16 Sun StorEdge 3000 Family Best Practices Manual • October 2003
High-Availability DAS Tips and Techniques
■ A Sun StorEdge 3510 FC array with two controllers can be configured to support
up to eight host connections. These connections can be used in pairs for
redundancy, individually or in any combination of both.
■ You will need to add SFP modules to support more than four host connections to
the Sun StorEdge 3510 array. For example, add two SFP modules to support six
connections and add four SFP modules to support eight connections.
■ Using two single-port 2-Gbit FC host adapters in a high-availability configuration
will make optimum use of the Sun StorEdge 3510 FC array’s redundancy.
Mapping logical drive partitions to two paths while using multipathing software
provides the best redundancy.
■ For complete redundancy and high availability, use multipathing software such as
Sun StorEdge Traffic Manager. To configure multipathing:
■ Establish two connections between a server and a Sun StorEdge 3510 FC array.
■ Install and enable the software on the server.
■ Map the logical drive to both of the controller channels to which the server is
connected.
TABLE 3 Configuration Overview for High Availability DAS
Single Server Configurations Dual Server Configurations Quad Server Configurations
Number of Servers 1 2 4
RAID Enclosures 1 1 1
Expansion Units As needed As needed One or more
Number of Controllers 2 2 2
Number of Disks 5 or more 12 or more 24 or more
Cache Optimization Random or sequential Random or sequential Random or sequential
RAID Levels Application-dependent Application-dependent Application-dependent
Fibre connection option Loop only Loop only Loop only
Dive Configuration One or more logical drives
plus one global spare
Two or more logical drives
plus one global spare
Four or more logical drives
plus one global spare
Host Adapters per server Two Single-Port 2-Gbit FC Two Single-Port 2-Gbit FC Two Single-Port 2-
Gbit FC
Traffic Manager Required Required Required
Storage Switches Not required Not required Not required