User Manual

274
Vess R2000 Series Product Manual Promise Technologies
redundAnt POrt cOnfigurAtiOn fOr nAs And iscsi
Use of redundancy will prevent disconnection in the event of a port failure on a controller or cable failure. For
dual controller subsystems, the iSCSI protocol already has Multipath I/O for redundancy and load balancing.
However for NAS it is necessary to create a port trunk to achieve this. Further redundancy is created with more
advanced cabling and two switches or routers, and with redundant IP settings.
The rst method of redundancy using a single switch or router, uses that same basic cabling arrangement as
illustrated in the previous example except that two ports on each controller are trunked and assigned a NAS
portal. This example is explained in “Table 2: Redundant portal settings” below and illustrated in “Redundancy
with port conguration”.
Table 2: Redundant portal sengs
ControllerID 1 2
PortID 1 2 3 4 1 2 3 4
Trunk 1 2
Trunk1 1 2 Trunk1
iSCSIPortalID 1 2 X 3 4 X
NASPortalID X X 16 X X If failover = NAS
Portal ID 16
Note
The I/O Network Management and iSCSI Management menus
for SAN conguration used to congure redundancies for multiple iSCSI
target and ports.