Important considerations for upgrading to RHV 4.4

Updated

Red Hat has observed customer support cases from customers running Red Hat Virtualization (RHV) 4.3 and earlier (RHEL 7 based hypervisors), encountering defects impacting VM snapshot operations, that are subsequently fixed in RHV 4.4 (RHEL 8 based hypervisors). Though there are several storage and VM snapshot related fixes for defects in RHV 4.3.z releases, we continue to see corner cases affecting RHV 4.3 customers. There are major architectural improvements in storage and networking components in RHV 4.4 (RHEL 8) improving reliability of certain storage operations. It is not possible to backport these changes to RHV 4.3 (RHEL 7); the improvements are only available in RHV 4.4 (RHEL 8). Customers running RHV 4.3 must upgrade to RHV 4.4 as soon as possible to avoid hitting these known issues.

These critical changes improve reliability and error handling in RHV 4.4 (RHEL 8), and are a major benefit to customers running business critical workloads on Red Hat Virtualization. Red Hat strongly recommends all customers running RHV 4.3 and earlier upgrade to RHV 4.4 as soon as possible. Customers and Partners may open proactive customer support cases with Red Hat to assist in planning and executing their RHV upgrades.

Please review the list of RHV 4.4 bug fixes documented in the Release Notes and consider scheduling your RHV upgrade as soon as possible to avoid hitting these known issues.

As an example, recent important fixes in the latest RHV 4.4.z:

  • This content is not included.Bug 1770027 - Live Merge completed on the host, but not on the engine, which just waited for it to complete until the operation was terminated. This issue was reported by seven different customers using BackupAPI in their environment. This problem is fixed in RHV 4.4.

  • This content is not included.Bug 1883399 - During migration, late volume extension request on src is possibly not refreshed on dst, qcow2 corrupt bit set. This bug has been reported by two different customers and it addresses the corruption of the guest's disk during live migration. Red Hat urges customers with large or busy VMs to upgrade to RHV 4.4.

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