Choose Yes or No depending on what other management or application tasks you are performing, but keep in mind that a reboot is required for the new MPIO device settings to take effect. If you choose not to reboot immediately and click No. A success message will be shown after adding the new device entry. Choose Yes or No depending on what other management or application tasks you are performing, but keep in mind that a reboot is required for the new settings to take effect.
This section describes how to update these timer values specifically for Windows Server R2 and R2 Service Pack 1 as the methods differ from what can be accomplished with newer versions of Windows Server.
Type is boolean and must be filled with either 0 disable or 1 enable. By default, it is disabled. As more and more data is consolidated on storage area networks SANs , the potential loss of access to storage resources is unacceptable.
To mitigate this risk, high availability solutions, such as MPIO, have now become a requirement. Additionally, you can pre-configure MPIO so that when it detects a certain hardware ID, it defaults to a specific load-balancing policy setting. Windows multipathing solutions are required if you want to utilize the MPIO framework to be eligible to receive logo qualification for Windows Server.
This joint solution allows storage partners to design hardware solutions that are integrated with the Windows operating system. Compatibility with both the operating system and other partner provided storage devices is ensured through the Windows Logo program tests to help ensure proper storage device functionality. This ensures a highly available multipath solution by using MPIO, which offers supportability across Windows operating system implementations.
To determine which DSM to use with your storage, refer to information from your hardware storage array manufacturer. Refer to your storage array manufacturer for information about which DSM to use with a given storage array, as well as the optimal configuration of it.
Multipath software suites available from storage array manufacturers may provide an additional value-add beyond the implementation of the Microsoft DSM because the software typically provides auto-configuration, heuristics for specific storage arrays, statistical analysis, and integrated management. We recommend using the DSM provided by the hardware storage array manufacturer to achieve optimal performance because the storage array manufacturer can make more advanced path decisions in their DSM that are specific to their array, which may result in quicker path failover times.
Without any multipath driver, the same devices through different physical paths would appear as totally different devices, thereby leaving room for data corruption. Figure 1 depicts this scenario. Following is the sequence of steps that the device driver stack walks through in discovering, enumerating, and grouping the physical devices and device paths into a logical set.
This assumes a scenario where a new device is presented to the server. If a new path for this same device arrives, MPIO then works with the DSM to determine whether this device is the same as any other claimed device. It then groups this physical path for the same device into a logical set for the multipath group that is called a pseudo-Logical Unit Number pseudo-LUN.
For dynamic discovery to work correctly, some form of identifier must be identified and obtainable regardless of the path from the host to the storage device.
Each logical unit must have a unique hardware identifier. The MPIO driver package does not use disk signatures placed in the data area of a disk for identification purposes by software.
Instead, the Microsoftprovided generic DSM generates a unique identifier from the data that is provided by the storage hardware. MPIO also provides for optionally using a unique hardware identifier assigned by the device manufacturer.
MPIO determines which paths to a device are in an active state and can be used for load balancing. Each vendor's load-balancing policy setting which may use any of several algorithms, such as Round Robin, the path with the fewest outstanding commands, or a vendor unique algorithm is set in the DSM.
In addition to the support for load balancing provided by MPIO, the hardware used must support the ability to use multiple paths at the same time, rather than just fault tolerance.
The process of detecting failed paths and recovering from the failure is automatic, usually fast, and completely transparent to the IT organization. The data ideally remains available at all times. Not all errors result in failover to a new path. When a fatal error occurs, the path is invalidated and a new path is selected. There are two primary types of load-balancing technologies referred to within Windows.
When addressing data path failover, such as the failover of host bus adapter HBA or iSCSI connections to storage, the following main types of failover are available:. Different behaviors are available depending on the type of failover technology used, and whether it is combined with a different type of failover or redundancy.
Consider the following scenarios:. This scenario provides for either a fault tolerant connection to data, or a load-balanced connection to storage. Since this layer of fault tolerant operation protects only the connectivity between the server and storage, it does not provide protection against server failure.
During normal operation, multiple data paths may be employed to provide greater aggregate throughput than one path can provide. All device-related functionality is initiated by the operating system, but under direct control of subroutines contained within each driver. These processes are considerably complicated when there are multiple paths to a device.
The MPIO software prevents data corruption by ensuring correct handling of the driver associated with a single device that is visible to the operating system through multiple paths.
Data corruption is likely to occur because when an operating system believes two separate paths lead to two separate storage volumes, it does not enforce any serialization or prevent any cache conflicts. Consider what would happen if a new NTFS file system tries to initialize its journal log twice on a single volume. Storage architecture in Windows consists of a series of layered drivers, as shown in Figure 2. Note that the application and the disk subsystem are not part of the storage layers.
When a device such as a storage disk is first added in, each layer of the hierarchy is responsible for making the disk functional such as by adding partitions, volumes, and the file system.
The stack layers below the broken line are collectively known as the device stack and deal directly with managing storage devices. Device drivers manage specific hardware devices, such as a disks or tapes, on behalf of the operating system. In conjunction with the class driver, the port driver handles Plug and Play PnP and power functionality. Port drivers manage the connection between the device and the bus.
Windows Server introduced a new port driver, StorPort, which is better suited to high-performance, high-reliability environments, and is typically more commonly used today than SCSIport. It seems that -s is not an parameter in Windows version. TechNet Subscriber Support in forum If you have any feedback on our support, please contact tnmff microsoft. Yes, i think that's the case. The system that i am using is recently updated via windows server update and it includes the KB Office Office Exchange Server.
Not an IT pro? Sign in. United States English. Volumes that are created on the StorSimple appliance and that are visible to this server appear under Disk Management as new disks. Initialize the disk and create a new volume.
During the format process, select a block size of 64 kilobytes KB. Under Disk Management , right-click the disk, and then click Properties. Note Do not change the default parameters. Default parameters:. When multiple subnets are not an option, you can still configure multiple interfaces on the same subnet for high-availability only purposes. For multipath-based HA and for load balancing, multiple sessions must be manually added to declare the different paths that are available.
For example, if the host has two interfaces that are connected to the storage area network SAN , and if the appliance has two interfaces that are connected to the SAN, four sessions are needed and have to be configured by using correct path permutations. To add sessions when an appliance that has two network adapters is connected to a host that has two network adapters, follow these steps:.
Perform a discovery of the target. This displays the Connect to Target dialog box. Leave the default selected target setting for Add this connection to the list of favorite targets. This makes the system automatically try to restart the connection every time that the computer restarts.
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