D-Link DSN-1100 X Stack User Manual page 93

Advanced Setting
Remote System Time
iSCSI Port Number
TCP/IP – Time to Live
TCP/IP – Maximum IP Segmentation
TCP/IP – Window Scale
TCP/IP – Timestamp
TCP/IP – PMTU
TCP/IP – Reset Upper Layer Counter
Email Notification Enabled
Email To Address
Email From Address
xStack Storage Management Center Software User's Guide
Table 5-2. Advanced System Settings
Description
Date and time of the xStack Storage, adjusted for its local time zone.
Specifies the TCP port number used for the iSCSI communication. The default
value for the iSCSI protocol is 3260 and should not be changed.
Specifies the Time To Live value set in the header of outgoing IP packets. This
value determines the maximum number of seconds an IP packet can live in the
network without reaching its destination. This limits the number of hops an IP
packet can pass through before being discarded. Default is 64 seconds.
Specifies the largest amount of data, in bytes, that TCP is willing to send in a
single segment. For best performance, this value should be set small enough to
avoid IP fragmentation, which can lead to excessive retransmissions if there is
packet loss. Default is 8960 bytes.
For efficient use of high bandwidth networks, a larger TCP window size can be
used. This option increases the maximum window size from 65,535 bytes to 1
Gigabyte. Scaling up to larger window sizes is a part of what is necessary for TCP
Tuning. This option is used only during the TCP 3-way handshake. The window
scale value represents the number of bits to left-shift the 16-bit window size field.
The window scale value can be set from 0 (no shift) to 14. Default is 0.
Causes the receiving computer to send a time-stamp reply back to the originating
computer. Systems can use time-stamp requests and replies to measure the
transmission speed of datagrams on a network.. Choices are:
Enabled = TCP/IP timestamp is enabled.

Disabled = TCP/IP timestamp is disabled. (default)

Determines whether the xStack Storage automatically adapts its packet size.
Choices are:
Enabled = xStack Storage automatically adapt its packet size. (default)

Disabled = xStack Storage keeps its default packet size (576 bytes), even if it

receives an ICMP request to change its packet size. This can render some
remote systems unreachable, because if intermediate systems on the path to
the remote system cannot support the default packet size, the xStack Storage
ignores their requests to make the packets smaller.
Determines whether the TCP/IP upper layer counters can be reset. Resetting the
counters simplifies the ability to look at the counters for an accurate percentage of
packets sent or received.
Choices are:
Enabled = upper layer counters can be reset.

Disabled = upper layer counters cannot be reset. (default)

Indicates whether the xStack Storage will send an alert notifications by email when
an event occurs. Choices are:
Enabled = xStack Storage will send an email alert. If you select this setting, the

following four fields must also be completed.
Disabled = xStack Storage will not send an email alert. (default)

Enter the email address where notifications are to be sent. This can be an
individual email address or a distribution list.
Enter an IP address, email address, or other meaningful entry that identifies the
xStack Storage as the source of the email.
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