vmware-backup-using-changed-block-tracking-failed-after-upgrading-to-vmware-esxi-6-0

VMware Backup using Changed Block Tracking failed after upgrading to VMware ESXi 6.0

VMware published a fix for the CBT issue causing VMware backups to fail when using VMware ESXi 6.0 as the hypervisor. So far the workaround was to disable Changed Block Tracking that caused long backup windows.

All customers that were using CBT to backup their VMs after installing or upgrading the ESXi version to 6.0 were affected when taking one of the following actions:

  • Backing up a virtual machine with Change Block Tracking (CBT) enabled fails after upgrading to VMware ESXi 6.0.x on host
  • Backing up a virtual machine with Change Block Tracking (CBT) enabled fails after installing VMware ESXi 6.0.x on host
  • Powering on the virtual machines fails.
  • Expanding the size of a virtual disk fails.
  • Taking virtual machine quiesced snapshots fails.
  • The vSphere Client displays the error similar to:

An error occurred while taking a snapshot: msg.snapshot.error-QUIESCINGERROR

Note: This error may or may not be present

  • In the /var/log/vmkernel.log file located on the ESXi host where the affected virtual machine is running, you see the error similar to:

T

T

T

  • In the vmware.log file of the affected virtual machine, you see an entry similar to:

vcpu-0| I120: DISKLIB-CBT : Creating cbt node 92b78c-cbt failed with error Cannot allocate memory (0xbad0014, Out of memory)

_You can read all about it here – VMware KB article 2114076_

The issue has been resolved with the following patch: 

VMware ESXi 6.0, Patch Release ESXi600-201505001 (2116125)

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Use Case - Tamper-resistant Clinical Trials

Goal:

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.).

Implementation:

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

Goal:

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.

Implementation:

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

Goal:

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, …)


Implementation:

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

Goal:

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.

Implementation:

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

Goal:

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.

Implementation:

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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