High-Availability DAS Tips and Techniques

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	Two or more logical drives	Four or more logical drives
	plus one global spare	plus one global spare	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

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.

16 Sun StorEdge 3000 Family Best Practices Manual • October 2003