Sun Microsystems StorEdge 3000 Series, Инструкция по установке, эксплуатации и обслуживанию

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1-8 Sun StorEdge 3000 Family Installation, Operation, and Service Manual • March 2004
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Controller communications over Fibre Channel. Selectable either through
dedicated loops or all drive loops. This allows a more flexible configuration of
redundant controllers.
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. Up to two
expansion units can be daisy-chained and connected to a single RAID array.
Up to 125 devices can be configured in a single FC loop. By default, the array
provides two drive loops and four host/drive 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 that have the following defaults:
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Channels 0, 1, 4, and 5 are host channels connected to servers and can be
reassigned as drive channels to connect to expansion units.
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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.
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FC-AL is the default mode. Point-to-point is also available.
The expansion unit has a total of four FC-AL ports.
Note –
Throughout this manual, Fibre Channel-Arbitrated Loops are referred to
simply as loops .
1.5.1 Host and Drive FC Architecture
RAID controller channels 0, 1, 4, and 5 are designated for host connections or for
connections to expansion chassis drives, depending on controller configuration
settings.