User manual

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ability. Beside the advantage of wide bandwidth, the I/O traffic remains operating until
all physical links fail. If any link is restored, it will be added to the link group
automatically. iStoragePro implements link aggregation as LACP and Trunking.
1. LACP (IEEE 802.3ad): The Link Aggregation Control Protocol (LACP) is a part
of IEEE specification 802.3ad. It allows bundling several physical ports together
to form a single logical channel. A network switch negotiates an automatic
bundle by sending LACP packets to the peer. Theoretically, LACP port can be
defined as active or passive. iStoragePro controller implements it as active
mode which means that LACP port sends LACP protocol packets automatically.
Please notice that using the same configurations between iStoragePro
controller and gigabit switch.
The usage occasion of LACP:
A. It’s necessary to use LACP in a network environment of multiple switches.
When adding new devices, LACP will separate the traffic to each path
dynamically.
2. Trunking (Non-protocol): Defines the usage of multiple iSCSI data ports in
parallel to increase the link speed beyond the limits of any single port.
The usage occasion of Trunking:
A. This is a simple SAN environment. There is only one switch to connect the
server and storage. And there is no extra server to be added in the future.
B. There is no idea of using LACP or Trunking, uses Trunking first.
C. There is a request of monitoring the traffic on a trunk in switch.
Caution
Before using trunking or LACP, he gigabit switch must support trunking
or LACP and enabled. Otherwise, host can not connect the link with
storage device.
RAG362