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Configuration Overview for High-Performance SAN (Continued)
TABLE 13
Small Configuration
Number of Disks
12 or more
Cache Optimization
Random or sequential
(Sun StorEdge 3510
FC array)
Cache Optimization
Sequential
(Sun StorEdge 3511
SATA array)
RAID Levels
Application-dependent
Fibre connection
Point-to-point only
option
Drive configuration
Two or more LUNs with
two or more global spares
Host Adapters per
Dual-port 2-Gbit FC
server
Traffic Manager
Required
Storage Switches
Two 8-port 2-Gbit
FC fabric switches
1 Refer to Table 1 to determine how many physical drives can be included in one logical drive.
High-Performance SAN Tips and Techniques
In the fabric SAN configuration, the switches communicate with the array host
I
ports using a fabric point-to-point (F_port) mode. This enables transparent
controller fail-over and fail-back without server-resident software. However,
supporting hot-swap servicing of a failed controller requires the use of
multipathing software, such as the Sun StorEdge Traffic Manager, on the
connected servers.
Use of fabric point-to-point (F_port) connections between an array and fabric
I
switches limits to 128 the total number of LUNs that can be presented. Fibre
channel standards allow only one ID per port when operating point-to-point
protocols, resulting in a maximum of four IDs, with a maximum of 32 LUNs each,
supporting up to 128 LUNs.
When a fabric switch is connected to one port of channel 0 or channel 1 of a Sun
I
StorEdge 3511 SATA array, no connections can be made with the other three ports
of that channel. If channel 0 (port FC0) is connected to a fabric switch, for
example, the second port for channel 0 on that controller, and the FC0 ports on a
Medium Configuration
12 or more
Random or sequential
Sequential
Application-dependent
Point-to-point only
Two or more LUNs with
1
two or more global spares
Dual-port 2-Gbit FC
Required
Two 16-port 2-Gbit
FC fabric switches
Best Practices for the Sun StorEdge 3510 and 3511 FC Arrays
Large Configuration
12 or more
Random or sequential
Sequential
Application-dependent
Point-to-point only
Two or more LUNs with
1
two or more global spares
Dual-port 2-Gbit FC
Required
Two 32-port 2-Gbit
FC fabric switches
1
39
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