Installation guide

Chapter 6. Redundant Storage Subsystem & Multipathing I/O
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Redundant storage subsystem contains dual-active controller for redundancy. It
requires native multi-path IO software built in various operation systems which
allows a host server access data over multiple paths. The following storage
subsystems support dual-active controller:
 Yotta 3 Fibre – SAS 12 Bay (Y3–12S6DF8)
 Yotta 3 Fibre – SAS 16 Bay (Y3–16S6DF8)
 Yotta 3 Fibre – SAS 24 Bay (Y3–24S6DF8)
 Yotta 3 SAS – SAS 12 Bay (Y3–12S6DS6)
 Yotta 3 SAS – SAS 16 Bay (Y3–16S6DS6)
 Yotta 3 SAS – SAS 24 Bay (Y3–24S6DS6)
The redundant storage subsystem supports different operation systems as
below:
 Windows Server 2003 (mpio_driver_dual)
 Windows Vista SP2 (MPIO)
 Windows 7 SP1 (MPIO)
 Windows Server 2008 SP2 (MPIO)
 Linux with 2.6.x kernel ( Device Mapper Multipath driver)
 Mac OS X (Default driver)
 Solaris 10 Update 4 (MPxIO)
6.1.1 Redundant SAS RAID Subsystem
Redundant SAS raid subsystem supports dual-active controller to provide a
high-availability storage subsystem. Both controllers monitor each other and if a
controller fails, another controller would take over all of I/O service. Redundant
SAS raid subsystem provides continuous data access and high availability with
dual-active controller.
6.1.2 Multipath I/O & No Single Point of Failure
Multipath I/O is a fault tolerance and performance enhancement technique
whereby there is more than one physical path between the host server machine
and its mass storage devices. Redundant path provides the data I/O protection
with multiple paths between the host server and storage subsystems.
Implementing Multipath I/O technology can minimize the potential crisis with