Zerto Virtual Replication – Reporting

In the last post, we describe how to test failover and now we will go through creating a report. If you missed the last post of this series checks the following link. Reporting Zerto Virtual Replication includes 7 types of reporting which are: Outbound Protection Over Time Protection Over Time by Site Recovery Reports Resources Report Usage VPG Performance Backup Report Log into the Zerto manager and the from Dashboard, click on the Reports. ِDefault report is Outbound Protection Over Time, which shows the information about how much data is actually being protected against the amount configured. You can change…

Read More

Zerto Virtual Replication – Failover

In this post, we will go through the failover test of a virtual machine. If you missed the first post of this series checks the following post. Failover There are two types of Failover available through Zerto: Test Failover and Live failover. Test failover is for test configuration and verifies virtual machine status after a simulated disaster situation. Live Failover is for a real disaster recovery situation, and should only be used when the original VM is offline or unavailable. Log into the Zerto manager and the from Dashboard, click on the Test. A wizard will be open and guide…

Read More

Zerto Virtual Replication – Configuration

In this post, we will go through the configuration of Virtual Replication Appliance (VRA) and Virtual Protection Group (VPG) and some basic configuration of Zerto Virtual Manager. If you missed the first post of this series, please check the following post. Install Zerto Virtual Replication Appliance Zerto Virtual Replication Appliance (VRA) is a lightweight appliance that is quickly installed on each host, capable of protecting all the virtual machines on that host. The VRA continuously replicates data from VMs and VMDKs to the remote site without a snapshot or CBT mechanism to avoid any negative impact on application performance. Requirements…

Read More

Zerto Virtual Replication – Installation

During a project, I had to work with Zerto virtual replication for the first time (I have worked with SRM but Zerto never!). It was great and valuable and forced me to write some posts about it. In a series of blog posts, I’m going to take you through the quick and complete guide of setting up and configuring Zerto virtual replication. Zerto Virtual Replication delivers IT resilience in a single platform for disaster recovery, data protection, and workload mobility to, from or between multiple clouds. By combining continuous replication, automated orchestration, and enterprise-class scalability, the Zerto platform dramatically simplifies…

Read More

Write Technology in Cache

In this post, I want to briefly describe three types of caches: write-through, write-back, and write-around. The cache is semiconductor memory where data is placed temporarily to reduce the time required to service I/O requests from the host. Write operations with cache provide performance advantages over writing directly to disks. A write operation with cache is implemented in three ways which have its advantages and disadvantages. Write-back cache: Data is placed in cache and an acknowledgment is sent to the host immediately. Later, data from several writes are committed to the disk. Write response times are much faster because the write operations…

Read More

vCenter appliance boot to emergency mode due to a corrupted file system

After I had to restart vCenter for some reason, this server failed to boot properly and went into the Emergency Mode. The appliance fails to start and reports the following message: To find out the root cause of this error, open the vCenter Console and scroll up (Shift + Page Up) the screen to see the first error. As you can see, one of the partitions “/dev/core_vg/core” is corrupted and it’s filesystem needs to be checked. First, check that none of your filesystems are full, enter the root password and type shell to access the bash shell and then type “df…

Read More

Get ESXi Hardware Information with Command

While resting at home, a friend contacted me and said he was looking for hardware information from his servers because he was going to increase the amount of RAM and upgrade the server’s memory to higher size and asked me to help him in order to find the memory information such as empty slot and part number. Their servers are HP and ESXi 6 is installed, and I asked him to check through the ILO, but unfortunately, ILO was not configured.So I had to look for a way to get the server information via ESXi, so I started searching for…

Read More

The SSL certificate of STS service cannot be verified

After I replace my new VCSA certificate with embedded PSC, I see the disconnected status in the NSX Manager dashboard in the Lookup Service section. When I try to configure Lookup Service in the NSX Manager I got the following error and after googling I find this KB, as in this KB mentioned, I check the port again but everything seems to be ok. However, I thought it was a certificate problem because before replacing the certificate it worked correctly.  Until I came across this article, which helps me a lot and I summarize it here. Although this article is for…

Read More

Replacing vCenter Server Certificates Rollback at 85%

Today I was replacing VMCA certificates by an ADCS (Active Directory Certificate Service) signed certificate, which everything went well except when I imported my certificate, the procedure stuck at 85 percent and rollbacked. and show you an error with this title. Status : 85% Completed [starting services…]Error while replacing Machine SSL Cert, please see /var/log/vmware/vmcad/certificate-manager.log for more information. When you go to read the “certificate-manager.log”, you see an entry like this: Error Failed to start vmon services.vmon-cli RC=1 After a lot of searching on the internet, I sum up with this good article which helps me to solve my problem. The procedure…

Read More

ESXTOP and Disk Performance Problems

One of the common problems in software-defined datacenters is the latency of the virtual machine disk which will slow down the application and increase response time. The virtual machine owner or user declares that its system is slow and the question arises whether the slowdown is coming from a virtual infrastructure or storage device or operating system and how to troubleshoot it? In this section, we will discuss the storage parameters in VMware ESXi and show you how troubleshot disk latency in your environment. Lets SSH to ESXi host and leverage esxtop command to identify the problem. Esxtop allows monitoring…

Read More