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Chapter 2. Introduction to IBM Flex System V7000 Storage Node
71
Draft Document for Review January 29, 2013 12:52 pm
8068ch02-HW Intro.fm
The iSCSI session, which consists of a
login phase
and a
full feature phase
, is completed with
a special command.
The login phase of the iSCSI is identical to the FC port login process (PLOGI). It is used to
adjust various parameters between two network entities and to confirm the access rights of
an initiator.
adjust various parameters between two network entities and to confirm the access rights of
an initiator.
If the iSCSI login phase is completed successfully, the target confirms the login for the
initiator; otherwise, the login is not confirmed and the TCP connection breaks.
initiator; otherwise, the login is not confirmed and the TCP connection breaks.
As soon as the login is confirmed, the iSCSI session enters the full feature phase. If more
than one TCP connection was established, iSCSI requires that each command / response
pair goes through one TCP connection. Thus, each separate read or write command is
carried out without the necessity to trace each request for passing separate flows. However,
separate transactions can be delivered through separate TCP connections within
one session.
than one TCP connection was established, iSCSI requires that each command / response
pair goes through one TCP connection. Thus, each separate read or write command is
carried out without the necessity to trace each request for passing separate flows. However,
separate transactions can be delivered through separate TCP connections within
one session.
For further details about configuring iSCSI, see Chapter 11, “SAN Connections and
Configuration” on page 431.
Configuration” on page 431.
2.5.15 Fiber Channel over Ethernet (FCoE)
Fiber Channel over Ethernet (FCoE) is a standard specified by ANSI T11 committee within
the FC-BB-5 for enabling the transmission of FC protocol and data across an ethernet
network. As shown in Figure 2-18, the new environment supports both FCoE and TCP/IP
traffic to be able to share a common ethernet network.
the FC-BB-5 for enabling the transmission of FC protocol and data across an ethernet
network. As shown in Figure 2-18, the new environment supports both FCoE and TCP/IP
traffic to be able to share a common ethernet network.
Figure 2-18 New enhanced ethernet environment support
Table 2-7 on page 72 shows the differences between the use of FCoE and iSCSI for transfer
environments.
environments.
Changing names: Before changing system or node names for an IBM Flex System V7000
Storage Node clustered system that has servers connected to it using SCSI, be aware that
because the system and node name are part of the IQN for the IBM Flex System V7000
Storage Node you can lose access to your data by changing these names. The IBM Flex
System V7000 Storage Node GUI shows a specific warning, but the CLI does
Storage Node clustered system that has servers connected to it using SCSI, be aware that
because the system and node name are part of the IQN for the IBM Flex System V7000
Storage Node you can lose access to your data by changing these names. The IBM Flex
System V7000 Storage Node GUI shows a specific warning, but the CLI does
not
.