Qlogic QLA4010, User Manual, Page: 77 / 82

6 – SANsurfer Control iX
Configuring the Firmware
IS0053302-00 7 PRELIMINARY 6-35
Q
❑
Ethernet Pause. When this check box is selected, the QLA4010/4010C
HBA accepts pause frames from a connected device. In addition, the
QLA4010 HBA will issue an ethernet pause to momentarily stop incoming
traffic when the SDRAM is almost full.
❑
Header Digest. When this check box is selected, iSCSi headers with CRC
protection can be transmitted. In addition, incoming iSCSI headers are
validated and the CRC protection removed.
❑
Data Digest. When this check box is selected, iSCSi data with CRC
protection can be transmitted. In addition, incoming iSCSI data is validated
and the CRC protection removed.
❑
ARP Redirect. When this check box is selected, MAC addresses are
discovered and bound to IP addresses for hosts to which the
QLA4010/4010C HBA wants to talk.
❑
Error Recovery Level. When this check box is selected, the
QLA4010/4010C HBA supports iSCSI error recovery level 0. At this level,
the QLA4010/4010C HBA closes a connection if it detects any errors.
❑
Nagle. When this check box is selected, the QLA4010/4010C HBA
supports the Nagle algorithm. Therefore, when a TCP connection has
outstanding data that has not been acknowledged (ACKed), small data
segments cannot be sent until the ACKs arrive. These data segments are
collected by TCP and sent in a single segment when the ACKs arrive. This
feature helps control congestion.
❑
TCP Timestamp. When this check box is selected, a timestamp is placed
in every transmitted TCP segment. When the receiver responds with an
acknowledge (ACK), the timestamp is included. Consequently, the
transmitter can calculate the round trip time (RTT) of the ACK. This value
is used in calculating retransmissions (if necessary). When this check box
is not selected, RTT can only be calculated on one outstanding segment
at a time (rather than on each segment).
❑
Strict iSCSI Login. When this check box is selected, the QLA4010/4010C
HBA adheres to the iSCSI login rules, and therefore cannot operate with
devices that do not conform to these rules. When this check box is not
selected, the iSCSI login rules are relaxed, and the QLA4010/4010C HBA
can operate with devices that do not conform to these rules.