Chapter 4: Subsystem Connection and Operation
host ports. A RAID5 logical drive of 6 members often brings optimal
array performance. A logical drive composed of only 3 members may
not deliver the best performance. You may attach the expansion
enclosures, S12S-J1002-R or S12S-J1000-G, to expand system
capacity.
Respective meanings of the legends used to illustrate these samples are as
below:
A host computer or a client station.
An iSCSI initiator, either a single- or dual-ported
host adapter card
Instances of the EonPath multi-pathing driver to
encompass 2 or more fault-tolerant paths
A GbE network switch
iSCSI ports on a RAID controller; the one with 4
ports signifying the controller on S12E-R1132-4,
and the one with 2 ports signifying the controller on
S12E-G1133-2
A logical drive consisting of multiple physical drives
A physical data link
A logical association, e.g., that between a logical
drive and a host port
*
An asteroid indicates a logical drive’s assignment (a
preferred ownership) either to RAID controller A or
RAID controller B
Data paths combined using the “multi-connections
per session” methodology. (Firmware rev. 3.64) In
iSCSI specifications, this is defined as a group of
network ports for an iSCSI TCP session.
A single GbE port delivers an approximate 100MB/s
throughput. Combining two GbE ports into a portal
group can double the bandwidth. You can combine
up to 4 ports into a group.
4.2.2
Sample Topology – Direct-Attached without Fault-tolerant
Paths
4-3
