Dot Hill Systems SANnet II 200 Service Manual Page 34

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1-14 SANnet II 200 FC, SATA, and SATA SE Array Installation, Operation, and Service Manual March 2005
1.5 Fibre Channel Architecture
Each RAID array has six Fibre Channels with the following defaults:
Channels 0, 1, 4, and 5 are host channels connected to servers. Any SANnet II 200
FC array host channels can be reassigned as drive channels to connect to expansion
units. SANnet II 200 SATA array channels 3 and 4 can also be reassigned as drive
channels.
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 units to the
configuration.
Note – SANnet II 200 SATA SE devices do not support expansion units. Use the
SANnet II 200 SATA device if your array requires expansion units.
FC-AL is the default mode. Point-to-point is also available.
The SANnet II 200 FC expansion unit has a total of four FC-AL ports. The SANnet II
200 SATA expansion unit has a total of eight FC-AL ports. The SANnet II 200 SATA
SE has a total of six FC-AL ports.
Note – Throughout this manual, Fibre Channel-Arbitrated Loops are referred to
simply as loops.
1.5.1 Redundant Configuration Considerations
This section provides information about setting up redundant configurations for
increased reliability. For more detailed information about configuration requirements,
refer to the SANnet II 200 FC and SATA Array Best Practices Manual.
1.5.1.1 Host Bus Adapters
Fibre Channel is widely applied to storage configurations with topologies that aim to
avoid loss of data due to component failure. As a rule, the connections between source
and target should be configured in redundant pairs.
The recommended host-side connection consists of two or more host bus adapters
(HBAs). Each HBA is used to configure a Fibre Channel loop between the host
computer and the array.
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