Redundant Controller
10-5
3.
W
ill those storage volumes be accessed in a multi-host or multi-path
configuration?
4.
F
ault Tolerance: Enabling the controllers for transparent failover and
failback. See
10.1.4
Logical Drive, Logical Volume, and Logical Partitions
Listed below are the basics about configuring a logical drive for a
redundant controller system:
!
All configuration options are available through the Primary
controller. Two controllers behave as one, and there is no need to
repeat the configuration on another controller.
!
Drive configuration process is the same using single or redundant
controllers.
!
Logical units can be manually assigned to different controllers to
facilitate the active-active configuration.
!
There is no limitation on drive allocation. The members of a
logical drive do not have to come from the same drive channel.
Grouping drives from different drive channels helps reduce the
chance of downtime by channel bus failure.
!
Each logical drive can be configured a different RAID level and
several logical drives can be striped across to compose a larger
logical volume.
!
Each of the logical units (logical drives, logical volumes, or one of
their partitions) can be made available on host ports through host
LUN mapping. Each of these logical units appears as a virtual
hard drive.
