ATTO Technology 2700C Benutzerhandbuch

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ATTO Technology Inc. iPBridge Installation and Operation Manual

7

Some older switches cannot autonegotiate 
between the host and the switch properly. You 
could have to force the host or switch to the 
desired speed.

For a NIC using an OS iSCSI driver, continue to the 
iSCSI OS driver section.

If the host uses a driver that allows the OS to talk to 
iSCSI targets via a NIC, not an iSCSI storage adapter:

1

A PC using an iSCSI storage adapter and an 
iSCSI OS driver might not work correctly on the 
same machine. Check with the vendors to 
make sure they are compatible. 

2

Verify that the PC has the latest iSCSI driver as 
well as the required service packs and patches. 
Check with the iSCSI OS driver vendor for more 
information.

3

Verify that the iSCSI OS driver has started. 
Look under 

Device Manager for Windows or 

lsmod for Linux.

4

Verify that the iSCSI OS is still looking for the 
iPBridge at the right IP address. 

5

If using DHCP, verify that the DHCP server is 
assigning the correct IP information to the host. 
Refer to 

6

Verify that the NIC is configured with the correct 
IP information.

7

Verify that the hosts and the iPBridge are using 
the same port number to communicate iSCSI 
on the ATTO ExpressNAV iSCSI page. The 
default port number for the iPBridge is 3260.

8

Check cable integrity. Check the cables for 
solid connections. Make sure they are plugged 
in properly. Inspect cable ends for broken clips 
and improper wiring.

1

Verify that the OS has the required service 
packs or patches installed. If not, obtain the 
proper service packs and patches and install 
them.

2

Some iSCSI host adapters and iSCSI OS 
drivers do not always automatically find new 
targets when plugged in or when forced to 
rescan. Reboot the hosts. 

3

Check if the vendor has a new driver. If so, 
install it.

1

Verify that the application is running the latest 
device drivers for the devices connected to 
iPBridge. If not, get the latest device drivers and 
install them.

2

Verify with the application vendor if the iSCSI 
technology is supported on the version of the 
application being used.

If the host is not getting the performance it should, 
check the following items. 

Verify that the devices are running at their highest 
possible speed. Refer to 

1

Verify that the data ports are set to auto 
negotiate or forced to 1000 Mbs on the 
ExpressNAV Ethernet page. 

2

Verify that the MTU size is set to optimal setting 
for the LAN/WAN environment. 
Refer to 

frame size is the current optimized frame size 
for the iPBridge. Smaller frame sizes causes a 
decrease in performance.

3

Verify that the iPBridge 

TraceLog feature is 

disabled. Tracelog tracks certain events that 

occur in the iPBridge. With this log enabled, 
performance suffers. 
Refer to 

1

Verify that the MTU size is set to optimal setting 
for the LAN/WAN environment on the ATTO 
ExpressNAV Ethernet page. 
9k frame size is the current optimized frame 
size for the iPBridge. Smaller frame sizes 
causes a decrease in performance. Many 
switch and router vendors do not support the 
larger frame size of 9k or 16k. 

2

Verify that each associated port in the IP SAN 
is configured for 1000Mbs.
IP SAN traffic should be segmented so that it 
does not interfere with the main LAN network 
traffic.For better performance, the IP SAN 
should be on its own set of hardware.