VM Limits-Hyper-V – Tech Blog

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
replace.me › › System Services › Memory Management. The Windows Server editions are exclusively available as a bit software and support up to 4 TB RAM now. Operating system. Version (32 or. Windows Server Datacenter edition ; Processor Chip Limit. 1. 2. 64 ; Memory Limit. 32GB. 64GB. 4TB. 4TB ; User Limit. Unlimited. Unlimited.
 
 

 

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Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. In this evaluation example, you will configure these computers and their storage in a single stretch cluster, where two nodes share one set of storage and two nodes share another set of storage, then replication keeps both sets of storage mirrored in the cluster to allow immediate failover.

These nodes and their storage should be located in separate physical sites, although it is not required. There are separate steps for creating Hyper-V and File Server clusters as sample scenarios. In this evaluation, servers in different sites must be able to communicate with the other servers via a network, but not have any physical connectivity to the other site\’s shared storage.

This scenario does not make use of Storage Spaces Direct. A pair of logical \”sites\” that represent two different data centers, with one called Redmond and the other called Bellevue. You can use only as few as two nodes, where one node each is in each site. However, you will not be able to perform intra-site failover with only two servers. You can use as many as 64 nodes. While it is possible to attach a storage device to a single server and use this for replication, Windows Failover Clustering still relies on SCSI Persistent Reservations.

Local disks or disks presented by a hypervisor might not be compatible. Many of these requirements can be determined by using the Test-SRTopology cmdlet. You get access to this tool if you install Storage Replica or the Storage Replica Management Tools features on at least one server. There is no need to configure Storage Replica to use this tool, only to install the cmdlet.

More information is included in the following steps. From this point on, always logon as a domain user who is a member of the built-in administrator group on all servers.

Always remember to elevate your PowerShell and CMD prompts going forward when running on a graphical server installation or on a Windows 10 computer. As of this point, the guide presumes you have two pairings of servers for use in a stretch cluster.

Restart nodes as needed. Consult your hardware vendor documentation for configuring shared storage and networking hardware. Ensure power management in Windows Server is set to high performance. Restart as required. Run ServerManager. Install the Failover Clustering , and Storage Replica roles and features on each of the nodes and restart them. If planning to use other roles like Hyper-V, File Server, etc. On SR-SRV04 or a remote management computer, run the following command in a Windows PowerShell console to install the required features and roles for a stretch cluster on the four nodes and restart them:.

Ensure that each set of paired server nodes can see that site\’s storage enclosures only i. You should use more than one single network adapter if using iSCSI. Provision the storage using your vendor documentation. After you setup your server nodes, the next step is to create one of the following types of clusters:. Skip this section and go to the Configure a file server for general use cluster section, if you want to create a file server cluster and not a Hyper-V cluster.

You will now create a normal failover cluster. After configuration, validation, and testing, you will stretch it using Storage Replica. You can perform all of the steps below on the cluster nodes directly or from a remote management computer that contains the Windows Server Remote Server Administration Tools. Create the Hyper-V compute cluster. Ensure that the cluster name is 15 characters or fewer. Windows Server now includes an option for Cloud Azure -based Witness.

You can choose this quorum option instead of the file share witness. Review Network Recommendations for a Hyper-V Cluster in Windows Server and ensure that you have optimally configured cluster networking. Add one disk in the Redmond site to the cluster CSV. To do so, right click a source disk in the Disks node of the Storage section, and then click Add to Cluster Shared Volumes. Using the Deploy a Hyper-V Cluster guide, follow steps within Redmond site to create a test virtual machine only to ensure the cluster is working normally within the two nodes sharing the storage in the first test site.

If you\’re creating a two-node stretch cluster, you must add all storage before continuing. For example, to validate two of the proposed stretch cluster nodes that each have a D: and E: volume and run the test for 30 minutes:.

Now you have mounted all your storage with drive letters, and can evaluate the cluster with Test-SRTopology. When using a test server with no write IO load on the specified source volume during the evaluation period, consider adding a workload or it Test-SRTopology will not generate a useful report.

You should test with production-like workloads in order to see real numbers and recommended log sizes. For instance, a sample with a low write IO workload for ten minutes to the D: volume: Diskspd. Once satisfied, remove the test virtual machine. Add any real test virtual machines needed for further evaluation to a proposed source node. There is no option to configure site awareness using Failover Cluster Manager in Windows Server Optional Configure VM resiliency so that guests do not pause for long during node failures.

Instead, they failover to the new replication source storage within 10 seconds. Create the File Server for General Use storage cluster you must specify your own static IP address the cluster will use. Configure a File Share Witness or Cloud Azure witness in the cluster that points to a share hosted on the domain controller or some other independent server. For example:. Once satisfied, remove the test VM. Optional Configure VM resiliency so that guests do not pause for long periods during node failures.

Create the File Server for General Use storage cluster. Under Roles , click Configure Role. Review Before you Begin and click Next. Provide a Client Access Point name 15 characters or fewer and click Next. Proceed through the wizard to configure shares. Create the Hyper-V compute cluster you must specify your own static IP address the cluster will use. Windows Server now includes an option for cloud witness using Azure. For more information about quorum configuration, see the Understanding cluster and pool quorum.

For Hyper-V workloads, on one node where you have the data you wish to replicate out, add the source data disk from your available disks to cluster shared volumes if not already configured. Do not add all the disks; just add the single disk. At this point, half the disks will show offline because this is asymmetric storage. If replicating a physical disk resource PDR workload like File Server for general use, you already have a role-attached disk ready to go.

Select the appropriate destination data volume and click Next. The destination disks shown will have a volume the same size as the selected source disk. When moving between these wizard dialogs, the available storage will automatically move and come online in the background as needed.

Select the appropriate source log disk and click Next. The source log volume should be on a disk that uses SSD or similarly fast media, not spinning disks. Select the appropriate destination log volume and click Next. The destination log disks shown will have a volume the same size as the selected source log disk volume.

Leave the Overwrite Volume value at Overwrite destination Volume if the destination volume does not contain a previous copy of the data from the source server. If the destination does contain similar data, from a recent backup or previous replication, select Seeded destination disk , and then click Next. Change it to Asynchronous Replication if you plan to stretch your cluster over higher latency networks or need lower IO latency on the primary site nodes.

Leave the Consistency Group value at Highest Performance if you do not plan to use write ordering later with additional disk pairs in the replication group. If you plan to add further disks to this replication group and you require guaranteed write ordering, select Enable Write Ordering , and then click Next.

On the Summary screen, note the completion dialog results. You can view the report in a web browser. At this point, you have configured a Storage Replica partnership between the two halves of the cluster but replication is ongoing.

There are several ways to see the state of replication via a graphical tool. Use the Replication Role column and the Replication tab. When done with initial synchronization, the source and destination disks will have a Replication Status of Continuously Replicating. This event states the number of copied bytes and the time taken. There should be no warnings of errors in this sequence.

There will be many events; these indicate progress. CPU and memory usage are likely to be higher than normal until initial synchronization completes. Add the source data storage only to the cluster as CSV.

To get the size, partition, and volume layout of the available disks, use the following commands:. Source and destination log volumes, where there is enough free space to contain the log size on both disks and the storage is SSD or similar fast media. On the source server, run the following command and examine events , , , , , and On the destination server, run the following command to see the Storage Replica events that show creation of the partnership.

On the destination server, run the following command and examine events , , , , , and to understand the processing progress.