nStor NexStor 4200F Series, User Manual

Page: 39 / 174

Chapter 2 - Topologies and Operating Modes
Multi-TID Single Host-Single Connection
27
Multi-TID Single Host-Single Connection
Duplex Mode Logical View - Multi-TID Single Host-Single Connection
This Multi-TID topology provides an active-active RAID storage solution for
single host systems with one Fibre port.
It offers advantages of lower initial costs, redundant active-active controllers, and
transparent failover and failback operations.
It has several disadvantages including performance limited bandwidth due to the
single Fibre loop, the host, host HBA and Fibre loop are single points of failure.
In this configuration the Host I/O card switches 4 and 5 are set to the “Up”
position.
Switch 4 ties the H0 and H1 ports to the same Fibre loop. This allows both host
port on each Host I/O card with an active connection to the specific controller
host port.
Switch 5 ties the port H0 on the right Host I/O card to H0 port on the left Host
I/O card. This allows both controller host ports to be seen on any of the Host I/O
cards ports.
FC HBA 1
Host/Server (Node A)
H0 H1
Right Host I/O Card
Left Host I/O Card
SW 4
H0 H1
SW 4
SW 5 SW 5
FC Host
C1P0
Active
FC Host
C1P1
Active
FC Host
C0P0
Active
FC Host
C0P1
Active
Controller 0 Controller 1
4200F.book Page 27 Thursday, January 23, 2003 2:47 PM