What is Control Plane

The NSX control plane runs in the NSX Controller cluster. NSX Controller is an advanced distributed state management system that provides control plane functions for NSX logical switching and routing functions. It is the central control point for all logical switches within a network and maintains information about all hosts, logical switches (VXLANs), and distributed logical routers.

The controller cluster is responsible for managing the distributed switching and routing modules in the hypervisors. The controller does not have any dataplane traffic passing through it. Controller nodes are deployed in a cluster of three members to enable high-availability and scale. Any … Read The Rest ......

What is Data Plane

The NSX data plane consists of the NSX vSwitch, which is based on the vSphere Distributed Switch (VDS) with additional components to enable services. NSX kernel modules, userspace agents, configuration files, and install scripts are packaged in VIBs and run within the hypervisor kernel to provide services such as distributed routing and logical firewall and to enable VXLAN bridging capabilities.

The NSX vSwitch (vDS-based) abstracts the physical network and provides access-level switching in the hypervisor. It is central to network virtualization because it enables logical networks that are independent of physical constructs, such as VLANs. Some of the benefits of … Read The Rest ......

How to Exclude Virtual Machines from NSX Manager Firewall Protection

 

6

NSX Manager, NSX Controllers, and NSX Edge virtual machines are automatically excluded from NSX distributed firewall protection. In addition, VMware recommends that you place the following service virtual machines in the Exclusion List to allow traffic to flow freely.

  • vCenter Server. It can be moved into a cluster that is protected by Firewall, but it must already exist in the exclusion list to avoid connectivity issues.

  • Partner service virtual machines.

  • Virtual machines that require promiscuous mode. If these virtual machines are protected by NSX distributed firewall, their performance may be adversely affected.

  • The SQL server that your Windows-based vCenter

Read The Rest ......

Configure a Syslog Server For NSX

NSX Manager sends all audit logs and system events to the syslog server.Lets configure the Syslog here.

03

Syslog data is useful for troubleshooting and reviewing data logged during installation and configuration.

NSX Edge supports two syslog servers. NSX Manager and NSX Controllers support one syslog server.

  1. In a Web browser, navigate to the NSX Manager appliance GUI at https://<nsx-manager-ip> or https://<nsx-manager-hostname>.
  2. Log in as admin with the password that you configured during NSX Manager installation.
  3. Click Manage Appliance Settings.

    01

  4. From the Settings panel, click General.
  5. Click Edit next to Syslog Server.
  6. Type the IP address or hostname,
Read The Rest ......

Basic esxcli Commands For vSAN Troubleshooting

images (3)

There are some very basic commands which are really useful in troubleshoting.

Use below esxcli commands to obtain information about Virtual SAN and to troubleshoot your Virtual SAN environment.

Command

Description

esxcli vsan network list

Verify which VMkernel adapters are used for Virtual SAN communication.

esxcli vsan storage list

List storage disks that were claimed by Virtual SAN.

esxcli vsan cluster get

Get Virtual SAN cluster information.

What is Virtual SAN Cluster Rebalancing

When any capacity device in your cluster reaches 80 percent utilization, Virtual SAN automatically rebalances the cluster, until the utilization of all capacity devices is below the threshold.

balance

Cluster rebalancing evenly distributes resources across the cluster to maintain consistent performance and availability.

Other operations can initiate cluster rebalancing:

  • If Virtual SAN detects hardware failures on the cluster

  • If Virtual SAN hosts are placed in maintenance mode with the Full data migration option

  • If Virtual SAN hosts are placed in maintenance mode with Ensure accessibility when objects assigned FTT=0 reside on the host.

To provide enough space for maintenance and reprotection,

Read The Rest ......

Manual Rebalance of vSAN Cluster

You can manually rebalance through the cluster health check, or by using RVC commands.

manual rebalance

If the Virtual SAN disk balance health check fails, you can initiate a manual rebalance in the vSphere Web Client. Under Cluster health, access the Virtual SAN Disk Balance health check, and click the Rebalance Disks button.

Use the following RVC commands to manually rebalance the cluster:

  • vsan.check_limits. Verifies whether any capacity device in the Virtual SAN cluster is approaching the 80 percent threshold limit.

  • vsan.proactive_rebalance [opts]<Path to ClusterComputeResource> –start. Manually starts the rebalance operation. When you run the command, Virtual SAN scans

Read The Rest ......

Automatic Rebalance of vSAN Cluster

Virtual SAN automatically rebalances the Virtual SAN cluster when a capacity device reaches 80 percent utilization. Rebalancing also occurs when you place a Virtual SAN host in maintenance mode.Its By Default.

autorebalance

Run the following RVC commands to monitor the rebalance operation in the cluster:

  • vsan.check_limits. Verifies whether the disk space utilization is balanced in the cluster.

  • vsan.whatif_host_failures. Analyzes the current capacity utilization per host, interprets whether a single host failure can force the cluster to run out of space for reprotection, and analyzes how a host failure might impact cluster capacity, cache reservation, and cluster components.

    The physical

Read The Rest ......

Why Virtual SAN Cluster Resynchronization Happen

When a hardware device, host, or network fails, or if a host is placed into maintenance mode, Virtual SAN initiates resynchronization in the Virtual SAN cluster. However, Virtual SAN might briefly wait for the failed components to come back online before initiating resynchronization tasks.

images (2)

The following events trigger resynchronization in the cluster:

  • Editing a virtual machine (VM) storage policy. When you change VM storage policy settings, Virtual SAN might initiate object recreation and subsequent resynchronization of the objects.Certain policy changes might cause Virtual SAN to create another version of an object and synchronize it with the previous version. When the

Read The Rest ......

What is RAID 5 or RAID 6 Erasure Coding

You can use RAID 5 or RAID 6 erasure coding to protect against data loss and increase storage efficiency. Erasure coding can provide the same level of data protection as mirroring (RAID 1), while using less storage capacity.

RAID-6

RAID 5 or RAID 6 erasure coding enables Virtual SAN to tolerate the failure of up to two capacity devices in the datastore. You can configure RAID 5 on all-flash clusters with four or more fault domains. You can configure RAID 5 or RAID 6 on all-flash clusters with six or more fault domains.

RAID 5 or RAID 6 erasure coding requires … Read The Rest ......