• Ensure that the CHAP settings for the initiator and the Gateway are the same.
• Force a rediscovery from the initiating iSCSI host.
• Reboot the devices and the Gateway.
If none of the above resolves your problem, please contact support. See Appendix D:
for information on how to contact Bridgeworks Support.
Poor Performance
Poor performance can be caused by many differing reasons. The following checklist is provided as
a guide to where you may find ways to improve performance.
• Ensure your initiator and Gateway are communicating at the fastest possible network speed.
Within the web interface is the
Network Connections
window, select this and check the
Link
Speed
entry in each of the
Link Status
Boxes. This should be
1000Mb/s
on a 1 Gigabit
network link. If this is 10 or 100Mb/s, this will limit the performance dramatically.
• Packet loss can be a cause of poor performance. Within the
Link Status Box
check the
number of
TX
and
RX
errors for both network interfaces that are displayed on each
Network
Port
page. This should be zero or a very small number. If these are showing large numbers
of errors, check the connections between the Gateway and the initiator. See Section 4.1.2:
for more information.
• Check that the entire network cabling between the initiator and the Gateway is of the correct
standard. See Section 2.1:
Connecting the Ethernet Interface
and Section 2.2:
•
Data Digests
are an extra level of error checking on top of the standard TCP/IP checksum
error checking (configured on the initiator). However, the calculation of these extra checksums
can greatly affect overall performance. Therefore,
Header and Data Digests
should only
be enabled where the integrity of the network connection is in doubt. Refer to Appendix B:
Connecting to an iSCSI Device using the Microsoft iSCSI Initiator
for more information.
• By enabling
Jumbo Frames
as explained in Section 4.1.2.1:
you can improve
the throughput performance of the Gateway. This will only work if
all
of the components in
the infrastructure between the initiator and the Gateway are enabled for jumbo frames. That
includes the Host Bus Adapter (HBA), all switches and routers, and the Gateway itself. If any
of the components are not enabled or not capable of handling jumbo frames, then unexplained
packet loss or corruption may occur.
If none of the above resolves your problem, please contact support. See Appendix D:
for information on how to contact Bridgeworks Support.
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