ATTO Technology 2500C - Manual (Page 71)

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Appendix
devices from both SCSI busses to increase overall
performance.
Each SCSI bus auto-negotiates the appropriate
sync rates with the connected devices. If slower
devices are mixed with faster devices, the bus
communicates at the rate of the slowest device,
thus wasting the performance capabilities of the
faster devices. Connect slower devices to one
SCSI port and connect faster devices to the other
port.
The iPBridge supports a wide variety of SCSI
storage devices including stand-alone drives,
removable drives, JBODs, RAIDs, tape, CD and
DVD drives, changers and libraries.
1 Connect the cable from the SCSI device to a
VHDCI SCSI port on the iPBridge.
2 Check the type of cable, cable length limit and
number of devices recommended for the port.
See Exhibit 0.0-1.
Keep cable lengths as short as possible to
ensure the highest signal quality and
performance. These cable lengths include the
wiring inside the devices.
3 Set the IDs of the SCSI devices connected to
the bridge to a value other than 7.
Use a sequential ID starting at 0 for each
device. The SCSI port in the ATTO iPBridge
has an internal factory setting ID of 7, typical for
a SCSI initiator device.
Note
The entire SCSI bus operates at the speed of
the slowest device on that bus. If you wish to
mix devices of different SCSI speeds, place
the devices on separate busses. That is, put
the slower devices on iPBridge 2500 SCSI bus
0, and the faster devices on iPBridge 2500
SCSI bus 1. Each bus is independent so each
can operate at different speeds.
4 Terminate the SCSI bus after the last device.
The iPBridge is terminated internally.
Ethernet connections
Use at least Cat 5e cable to connect the Ethernet
ports to your network.
Note
For best performance, all cabling, network
interface cards (NICs), host bus adapters
(HBAs), and network switches must be Gigabit
Ethernet (GbE), and at least Cat 5e certified.
Most standard offices use 2-pair wiring which
is not compatible. GbE requires 4-pair wiring.
For best performance, support for 9014 byte
jumbo frames should be available for all switches
and host iSCSI equipment.
Before you begin installing the iPBridge Ethernet
ports, be sure to check or complete the following:
• If you are managing your iSCSI system across a
WAN and your system uses a firewall, be sure
that the following ports are open and available:
If you are using the TCP protocol
• telnet (port 23)
• http
(port 80)
• ftp (ports 20 and 21)
• iSCSI (port 3260)
• iSNS (port 3705)
If you are using the UDP protocol
• ntp (port 123)
• Be sure your host system(s) is set up and
configured.
• Your host system can use any of three
different types of cards: a network interface
card (NIC), a telnet offload engine card
(TOE), or a storage network interface card
(SNIC).
• The ATTO driver file from the CD included
with your iPBridge or from the ATTO
website,
www.attotech.com , is installed on
your host.
• The switch has been configured to forward
UDP broadcast messages.
• The minimum requirement for Windows-based
browsers is Internet Explorer 5.5 or Netscape
Navigator 6.2. The minimum requirement for
Macintosh browsers is Internet Explorer 5.2 or
Safari 1.2.
• Ethernet speed defaults to auto; the iPBridge
determines the speed and set other parameters
based on the speed.