Chapter 1 Product and Architecture Overview 1-11
1.4.5 Scalability
The Fibre Channel architecture brings scalability and easier upgrades to storage.
Storage expansion can be as easy as cascading another expansion unit to a
configured RAID array without powering down the running system. The maximum
number of expansion units supported by a single Sun StorEdge Fibre Channel array
is:
â– Sun StorEdge 3510 FC Array. Up to 8 expansion units.
â– Sun StorEdge 3511 FC Array. Up to 5 expansion units.
Note – Do not mix the Sun StorEdge 3510 FC expansion units with Sun StorEdge
3511 FC arrays or vice versa. Connect only Sun StorEdge 3510 FC expansion units to
Sun StorEdge 3510 FC arrays, and connect only Sun StorEdge 3511 FC expansion
units to Sun StorEdge 3511 FC arrays.
Up to 125 devices can be configured in a single FC loop. By default, the array
provides two drive loops and four host loops, and operates in Fibre Channel-
Arbitrated Loop (FC-AL) and fabric topologies.
1.5 Fibre Channel Architecture
Each RAID array has six Fibre Channels with the following defaults:
â– Channels 0, 1, 4, and 5 are host channels connected to servers. Any Sun StorEdge
3510 FC array host channels can be reassigned as drive channels to connect to
expansion units. Sun StorEdge 3511 FC array channels 3 and 4 can also be
reassigned as drive channels.
â– Channels 2 and 3 are dedicated drive channels that connect the internal 12-disk
drives in the RAID chassis, and can also be used to add expansion chassis to the
configuration.
â– FC-AL is the default mode. Point-to-point is also available.
The Sun StorEdge 3510 expansion unit has a total of four FC-AL ports. The Sun
StorEdge 3511 expansion unit has a total of eight FC-AL ports.
Note – Throughout this manual, Fibre Channel-Arbitrated Loops are referred to
simply as loops.
See chapter 4 for detailed host and drive channel information.
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