What is an HA pair?

What is an HA pair?

An HA pair is two storage systems (nodes) whose controllers are connected to each other directly. In this configuration, one node can take over its partner’s storage to provide continued data service if the partner goes down.

How many types of data synchronization preference options are available in always on?

The possible choices include Automatic seeding, Full database and log backup, Join only, or Skip initial data synchronization.

What is data synchronization example?

Let’s see a simple example of data synchronization: Suppose we have added a new popular ringtone to one of the servers of a mobile service provider, so here, data synchronization means that all the service provider servers get identical sets of ringtones.

How SQL Always on replication works?

SQL Server maintains the log entries until the time secondary replica becomes available. Once it reconnects with Secondary replica, it sends all log blocks as per the usual process. It increases the transaction log size in Primary replica until the secondary replica is unavailable.

How do you set a HA pair?

For installation and upgrade details, see Custom Install and Upgrade an HA Pair….To set up high availability:

  1. Step 1: Configure the Controller High Availability Pair Environment.
  2. Step 2: Install a Controller High Availability Pair.
  3. Step 3: Activate the Controller High Availability Pair.
  4. Step 4: Install as a Service.

How do I configure HA?


  1. Log in to the Active node with the vSphere Client.
  2. Select the vCenter Server object in the inventory and select the Configure tab.
  3. Select vCenter HA under settings.
  4. Click on the Set Up vCenter HA button to start the setup wizard.
  5. Click Management vCenter Server credentials.

Which of the following is the most commonly used standard for performing synchronization?

Which of the following is the most commonly used standard for performing synchronization? Explanation: SyncML stands for Synchronization Markup Language.

Can we take differential backup in always on?

Failovers should have no effect on your ability to perform a differential backup. So long as the new replica is up to date, a differential backup should work just fine.

What is synchronous mode in SQL Server?

Synchronous-commit mode emphasizes high availability over performance, at the cost of increased transaction latency. Under synchronous-commit mode, transactions wait to send the transaction confirmation to the client until the secondary replica has hardened the log to disk.

What are the prerequisites while configuring an HA pair?

Prerequisites for HA setup:

  • The same model—both the devices in the pair must be of the same hardware model or virtual machine model.
  • The same PAN-OS version—both the devices should be running the same PAN-OS version and must each be up-to-date on the application, URL, and threat databases.

What is HA and how it works?

HA monitors whether sufficient resources are available in the cluster at all times in order to be able to restart virtual machines on different physical host machines in the event of host failure.

Which of the following tool you will use to provide a synchronization?

Which one of the following is a synchronization tool? Explanation: Semaphore is a synchronization tool. Semaphore is a mechanism which synchronizes or controls access of threads on critical resources.

What are requirements to be considered for time sync protocol?

No matter the scheme used, all synchronization methods have the four basic components: send time, access time, propagation time, and receive time. There are many synchronization protocols, many of which do not differ much from each other.

Can we take differential backup in always on secondary?

Differential backups aren’t supported on secondary replicas. Concurrent backups, such as executing a transaction log backup on the primary replica while a full database backup is executing on the secondary replica, is currently not supported.

What does copy only backup mean?

Copy_Only backup A copy-only backup is a special type of full backup, which is independent of the conventional sequence of backups. The difference between copy-only and a full backup is that a copy-only backup doesn’t become a base for the next differential backup. A full backup works on all database recovery models.