System information

5
Configuring iSCSI Connections
5-7
Configuring iSCSI Ports
•Select Auto-reset port on severe errors especially when the port is
a part of a mission-critical configuration.
Manual Reset: You may not want the auto-reset option to be on
when you are troubleshooting unrecoverable errors. In this
case, you can do a manual reset by clicking Reset Port in the
FC/Ethernet Port Configuration dialog box.
2. Set the MTU size.
The MTU (maximum transmission unit) size can be used to
prevent accidental fragmentation when the path (discovered)
MTU value, as returned by paths from/to this port, is incorrect.
This can occur with some security/encryption appliances on the
network, where the MTU size may not be correctly reported. The
following options are available:
• Auto - Use the discovered MTU size. This is the default setting.
• Manual - Forces the system to use the configured value for
MTU size and DOES NOT do auto-discovery. The range is
from 512 to 4096, the default size is 1500.
• Min (Auto, Manual) - Does auto -discovery and uses the
minimum of the discovered and configured values.
Storage-Optimized TCP Parameters:
Storage-optimized TCP is a set of enhancements made to the TCP
behavior to ensure high throughput in a dedicated network in
enterprise environments typically used for storage traffic. These
enhancements are built on the inherent reliability of TCP by
optimizing the traffic control features in a dedicated network.
Following are the TCP feature enhancements that make up the
storage-optimized TCP:
• Reorder resistance in case of out-of-order packet delivery.
• Quick start with higher initial value of congestion window.
• Smaller reduction in congestion window on slow start and fast
retransmit.
• Disabling congestion avoidance phase in fast retransmit and
fast recovery.
• Reduced slow start timeout.
You can implement these enhancements by selecting the checkboxes
provided in the
Setting the Advanced TCP Parameters on page 5-6.