ATTO Technology 2500C - Manual (Page 39)

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2 If there are routers involved in the setup, make
sure the IP addresses and/or MAC addresses
of the iPBridge are allowed through the router.
3 Verify that the switch can see the iPBridge on
the port(s) in question. Refer to your switch
vendor’s guide for more information.
Checking the iSCSI Host Adapter or NIC
iSCSI host adapters appear as a type of Storage
Controller to the host OS, not as a standard NIC. These
adapters usually have hardware acceleration to offload
the TCP processing from the host. Configuration of
these adapters is usually done through the vendor’s
own utility and not through the OS itself.
NICs come in two types: accelerated and un-
accelerated. Accelerated NICs use some hardware to
offload some of the TCP processing from the host. Un-
accelerated NICs make the OS do all TCP processing.
To check the iSCSI host adapter or NIC
1 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.
2 Verify that the iSCSI host adapter or NIC is
configured with the correct IP information.
3 If using DHCP, verify that the DHCP server is
assigning the correct IP information to the host.
4 Verify that the hosts are running the
recommended driver and firmware level for the
iSCSI host adapter or NIC vendor.
5 Verify that the hosts and the iPBridge are using
the same port number to communicate via
iSCSI. The default port number for the iPBridge
is 3260. Refer to
iSCSIPortNumber on page 55.
6 Make sure the host adapter/NIC is configured
to log into the iPBridge. Some iSCSI host
adapters do not re-login upon reboot or
unplug/replug event without marking a check
box.
7 Some older switches cannot autonegotiate
between the host and the switch properly. You
may 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.
Checking the iSCSI OS driver
This section is for hosts using 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
Ethernet Port Configuration on page
23.
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 via
iSCSI. The default port number for the iPBridge
is 3260. Refer to
iSCSIPortNumber on page 55.
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.
Checking the Operating System
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.
Checking the applications
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.