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Chapter 4: Subsystem Connection and Operation
Subsystem Connection and Operation 4-11
o Concern: One major concern for this topology is to avoid ID conflicts
on the host channels. When cascaded, logical drives from
different RAID subsystems should be associated with
different host channel IDs.
o Hub Disabled: When the onboard hub is disabled, SFP ports are
specific to each RAID controller. If you connect
application servers through FC switches, disable the
onboard hub. Namely, the onboard hub should be
disabled where FC port bypass can be provided
externally.
• Pins #5 + 6: Currently the Fibre Channel device Auto- Negotiation
does not work with all FC HBAs or switches. Please
contact Galaxy tech support for certified equipment
list for more information. Host-side connections must
operate either at the fixed 4Gbps or 2Gbps speed. If
your current storage network comprises of 2Gbps
devices, set channel speed to 2Gbps.
WARNING!
When the speed selection is manually switched for host channels to run at
a 2G speed, subsystem firmware must also be adjusted accordingly. You
may access the firmware using the LCD in front of the subsystem, RS-
232C hyper terminal screen, telnet and RAIDWatch management software.
If the Fibre port speed options are not coordinated with the firmware, the
data transfer rate may eventually slow down and cause system error.
Make sure the Channel bus Data Rate setting in firmware is consistent
with your DIP switch selection. The firmware configuration options can be
found in Main Menu, “View and Edit Channels,” “Data Rate.”
Changing the configuration requires resetting the subsystem.