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xStack Storage Management Center Software User’s Guide 83

Table 5-2. Advanced System Settings

Advanced Setting Description

Remote System Time Date and time of the xStack Storage, adjusted for its local time zone.

iSCSI Port Number Specifies the TCP port number used for the iSCSI communication. The default

value for the iSCSI protocol is 3260 and should not be changed.

TCP/IP – Time to Live 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.

TCP/IP – Maximum IP Segmentation 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.

TCP/IP – Window Scale 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.

TCP/IP – Timestamp 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)

TCP/IP – PMTU 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.

TCP/IP – Reset Upper Layer Counter 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)

Email Notification Enabled 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)

Email To Address Enter the email address where notifications are to be sent. This can be an

individual email address or a distribution list.

Email From Address 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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