Benefits to Solving

By upgrading from an old virtual network device, such as a Vlance adapter, to the latest VMXNET3 paravirtualized drivers, VMware performance for the virtual machine can be dramatically improved.
This is because a Vlance adapter creates many more unnecessary IRQ requests compared to a VMXNET3 and a Vlance is not able to use any of the physical NIC features to offload and optimize network packets.
Therefore older network virtual network devices can cause slow VMware performance for the VM they are attached to as well as negatively affect all other VMs due to the noisy neighbor syndrome.

Ease of Solving

The easiest way to solve this issue is to use the following four-step process. (Note that the virtual machine must be rebooted to update the virtual network adapter type.)

  1. Upgrade the virtual machine hardware by:

  2. Shutting down the virtual machine
  3. Right-clicking on the virtual machine
  4. Going to "All vCenter Actions", to "Compatibility", and then clicking on "Upgrade VM Compatibility"
  5. Select the new VM compatibility mode to the latest compatibility mode which, as of today, is ESXi 5.5 and later, then click OK

  6. Add a new virtual network adapter by:

  7. Clicking "edit settings" for the virtual machine
  8. Clicking on "Select" next to New Device
  9. Clicking on "Network"
  10. Clicking "Add" then setting the new virtual network device’s network to match the current network of the out of date virtual network adapter
  11. Expanding the virtual network device
  12. Setting the adapter type to the latest version (which at this time is VMXNET 3)

  13. Remove the old virtual network adapter (which is still in settings) by clicking on the X next to the old adapter, then clicking OK
  14. Power On the virtual machine and, once booted, reconfigure the new virtual network adapter with the IP configuration of the old virtual network adapter.

How opvizor helps

In order to prevent poor VMware performance slowing down the application as a result of outdated network adapters, opvizor is able to quickly identify the virtual machines that run such virtual network adapters (Figure 1). With this information, you’ll be able to update the virtual machines that are out of date and prevent application performance issues before they impact users. old VMware NIC causing bad VMware performance - opvizor
Additionally, you’ll be able to eliminate the finger pointing that all too commonly occurs when there is poor network performance in the virtual infrastructure.
Thanks David Davis

CHECK Part 1

Metrics and Logs

(formerly, Opvizor Performance Analyzer)

VMware vSphere & Cloud

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Use Case - Tamper-resistant Clinical Trials


Blockchain PoCs were unsuccessful due to complexity and lack of developers.

Still the goal of data immutability as well as client verification is a crucial. Furthermore, the system needs to be easy to use and operate (allowing backup, maintenance windows aso.).


immudb is running in different datacenters across the globe. All clinical trial information is stored in immudb either as transactions or the pdf documents as a whole.

Having that single source of truth with versioned, timestamped, and cryptographically verifiable records, enables a whole new way of transparency and trust.

Use Case - Finance


Store the source data, the decision and the rule base for financial support from governments timestamped, verifiable.

A very important functionality is the ability to compare the historic decision (based on the past rulebase) with the rulebase at a different date. Fully cryptographic verifiable Time Travel queries are required to be able to achieve that comparison.


While the source data, rulebase and the documented decision are stored in verifiable Blobs in immudb, the transaction is stored using the relational layer of immudb.

That allows the use of immudb’s time travel capabilities to retrieve verified historic data and recalculate with the most recent rulebase.

Use Case - eCommerce and NFT marketplace


No matter if it’s an eCommerce platform or NFT marketplace, the goals are similar:

  • High amount of transactions (potentially millions a second)
  • Ability to read and write multiple records within one transaction
  • prevent overwrite or updates on transactions
  • comply with regulations (PCI, GDPR, …)


immudb is typically scaled out using Hyperscaler (i. e. AWS, Google Cloud, Microsoft Azure) distributed across the Globe. Auditors are also distributed to track the verification proof over time. Additionally, the shop or marketplace applications store immudb cryptographic state information. That high level of integrity and tamper-evidence while maintaining a very high transaction speed is key for companies to chose immudb.

Use Case - IoT Sensor Data


IoT sensor data received by devices collecting environment data needs to be stored locally in a cryptographically verifiable manner until the data is transferred to a central datacenter. The data integrity needs to be verifiable at any given point in time and while in transit.


immudb runs embedded on the IoT device itself and is consistently audited by external probes. The data transfer to audit is minimal and works even with minimum bandwidth and unreliable connections.

Whenever the IoT devices are connected to a high bandwidth, the data transfer happens to a data center (large immudb deployment) and the source and destination date integrity is fully verified.

Use Case - DevOps Evidence


CI/CD and application build logs need to be stored auditable and tamper-evident.
A very high Performance is required as the system should not slow down any build process.
Scalability is key as billions of artifacts are expected within the next years.
Next to a possibility of integrity validation, data needs to be retrievable by pipeline job id or digital asset checksum.


As part of the CI/CD audit functionality, data is stored within immudb using the Key/Value functionality. Key is either the CI/CD job id (i. e. Jenkins or GitLab) or the checksum of the resulting build or container image.

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