Users Guide
Management Module (EMM) by utilizing the remaining path. When redundant paths exist, the controller automatically balances I/O load
through both paths to each disk. Load balancing increases throughput to virtual disks in storage enclosures and is automatically turned on
when redundant paths are detected. The ability to load balance I/O can be disabled using the Dell OpenManage storage management
application. To set up your hardware to support redundant paths, see Setting up redundant path support on the PERC H830 adapter.
NOTE: This is applicable for PERC H830 only.
NOTE: This support for redundant paths refers to path redundancy only and not to controller redundancy.
Setting up redundant path support on the PERC H830 adapter
The PERC H830 card can detect and use redundant paths to disks contained in enclosures. With redundant paths to the same device, if
one path fails, another path can be used to communicate between the controller and the device.
To set up a conguration with redundant paths, both ports on a controller must be cabled to the in ports of a single enclosure. To add
multiple enclosures, both out ports (EMM0_Out and EMM1_Out) of the rst enclosure must be cabled to the in ports (EMM3_In and
EMM4_In) of the next enclosure. If the connection between an out port on the controller and an in port on an enclosure fails, an alternate
path exists through the second out port on the controller and the second in port on the enclosure.
NOTE: The PERC H830 card supports redundant paths when used with Dell PowerVault MD3 series disk storage enclosures.
To Set up an enclosure on the PERC H830 card:
1 Connect two SAS cables from the out ports (EMM0_Out and EMM1_Out) on your PERC H830 card to the in ports (EMM3_In and
EMM4_In) of the external enclosure.
Features
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