White Papers

3
 SUSE Linux Enterprise Server 11 SP1, also known as SLES 11 SP1
 PS Series firmware version 5.0.2
Deployment scenarios
PS Series arrays connect to servers through physical Ethernet connections, either 1GbE
or 10GbE. If the server has multiple NIC’s, then one can be used for data traffic and one
(or more) can be used for iSCSI storage traffic.
Single-path I/O connection environment:
In a single-path I/O configuration one physical Ethernet connection exists between the
iSCSI initiator and the PS Series array. Refer to Figure 1 for a visual. Since there is only
one physical connection, no redundancy exists. If the connection path fails,
communication between the server (iSCSI initiator) and the PS Series array (iSCSI target
volume) is lost.
Figure 1: Single-path I/O connection environment
Multipath I/O connection environment:
In a multipath I/O configuration two (or more) physical Ethernet connections exist
between the iSCSI initiator and the PS Series array. EqualLogic multipath I/O provides