Information Technology Reference
In-Depth Information
4.
Right-click the volume where the mount point folder will be assigned, and select Change
Drive Letter And Paths.
5.
Click Add.
6.
Either type the path to an empty folder on an NTFS volume or click Browse to select or
make a new folder for the mount point.
When you explore the drive, you'll see the new folder created. Notice that the icon indicates
that it is a mount point.
Microsoft MPIO
Multipath I/O (MPIO) is associated with high availability because a computer will be able
to use a solution with redundant physical paths connected to a storage device. Thus, if
one path fails, an application will continue to run because it can access the data across the
other path.
The MPIO software provides the functionality needed for the computer to take
advantage of the redundant storage paths. MPIO solutions can also load-balance data
traffic across both paths to the storage device, virtually eliminating bandwidth bottlenecks
to the computer. What allows MPIO to provide this functionality is the new native
Microsoft Device Specific Module (Microsoft DSM) . The Microsoft DSM is a driver that
communicates with storage devices—iSCSI, Fibre Channel, or SAS—and it provides the
chosen load-balancing policies. Windows Server 2012 R2 supports the following load-
balancing policies:
Failover In a failover configuration, there is no load balancing. There is a primary path
that is established for all requests and subsequent standby paths. If the primary path fails,
one of the standby paths will be used.
Failback This is similar to failover in that it has primary and standby paths. However,
with failback you designate a preferred path that will handle all process requests until it
fails, after which the standby path will become active until the primary reestablishes a con-
nection and automatically regains control.
Round Robin In a round-robin configuration, all available paths will be active and will be
used to distribute I/O in a balanced round-robin fashion.
Round Robin with a Subset of Paths In this configuration, a specific set of paths will be
designated as a primary set and another as standby paths. All I/O will use the primary set
of paths in a round-robin fashion until all of the sets fail. Only at this time will the standby
paths become active.
Dynamic Least Queue Depth In a dynamic least queue depth configuration, I/O will route
to the path with the least number of outstanding requests.
Weighted Path In a weighted path configuration, paths are assigned a numbered weight.
I/O requests will use the path with the least weight—the higher the number, the lower the
priority.
 
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