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Configuration Overview for High Availability DAS (Continued)
TABLE 9
Number of Disks
Cache Optimization
(Sun StorEdge 3510 FC
Array)
Cache Optimization
(Sun StorEdge 3511 SATA
Array)
RAID Levels
Fibre connection option
Drive Configuration
Host Adapters per
server
Traffic Manager
Storage Switches
1 Refer to Table 1 to determine how many physical drives can be included in one logical drive.
High-Availability DAS Tips and Techniques
A Sun StorEdge 3510 FC array with two controllers can be configured to support
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up to eight host connections. The Sun StorEdge 3511 SATA array can be
configured to support up to 12 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
I
the 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
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will make optimum use of a Sun StorEdge Fibre Channel 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
I
Sun StorEdge Traffic Manager. To configure multipathing:
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Single Server Configurations
5 or more
Random or sequential
Sequential
Application-dependent
Loop only
One or more logical drives
plus one or more global
1
spare
Two Single-Port 2-Gbit FC
Required
Not required
Establish two connections between a server and a Sun StorEdge Fibre Channel
array.
Install and enable the software on the server.
Dual Server Configurations
12 or more
Random or sequential
Sequential
Application-dependent
Loop only
Two or more logical drives
plus two or more global
1
spares
Two Single-Port 2-Gbit FC
Required
Not required
Best Practices for the Sun StorEdge 3510 and 3511 FC Arrays
Quad Server Configurations
24 or more
Random or sequential
Sequential
Application-dependent
Loop only
Four or more logical drives
plus four or more global
1
spares
Two Single-Port 2-
Gbit FC
Required
Not required
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