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Chapter 17. Troubleshooting
This section provides information for troubleshooting common migration issues.
17.1. Error messages
This section describes error messages and how to resolve them.
17.1.1. warm import retry limit reached
The warm import retry limit reached error message is displayed during a warm migration if a VMware virtual machine (VM) has reached the maximum number (28) of changed block tracking (CBT) snapshots during the precopy stage.
To resolve this problem, delete some of the CBT snapshots from the VM and restart the migration plan.
17.1.2. Unable to resize disk image to required size
The Unable to resize disk image to required size error message is displayed when migration fails because a virtual machine on the target provider uses persistent volumes with an EXT4 file system on block storage. The problem occurs because the default overhead that is assumed by CDI does not completely include the reserved place for the root partition.
To resolve this problem, increase the file system overhead in CDI to more than 10%.
17.2. Using the must-gather tool
You can collect logs and information about MTV custom resources (CRs) by using the must-gather tool. You must attach a must-gather data file to all customer cases.
You can gather data for a specific namespace, migration plan, or virtual machine (VM) by using the filtering options.
If you specify a non-existent resource in the filtered must-gather command, no archive file is created.
Prerequisites
-
You must be logged in to the OpenShift Virtualization cluster as a user with the
cluster-adminrole. -
You must have the Red Hat OpenShift CLI (
oc) installed.
Procedure
-
Navigate to the directory where you want to store the
must-gatherdata. Run the
oc adm must-gathercommand:$ oc adm must-gather --image=registry.redhat.io/migration-toolkit-virtualization/mtv-must-gather-rhel8:2.9.7The data is saved as
/must-gather/must-gather.tar.gz. You can upload this file to a support case on the Red Hat Customer Portal.Optional: Run the
oc adm must-gathercommand with the following options to gather filtered data:Namespace:
$ oc adm must-gather --image=registry.redhat.io/migration-toolkit-virtualization/mtv-must-gather-rhel8:2.9.7 \ -- NS=<namespace> /usr/bin/targetedMigration plan:
$ oc adm must-gather --image=registry.redhat.io/migration-toolkit-virtualization/mtv-must-gather-rhel8:2.9.7 \ -- PLAN=<migration_plan> /usr/bin/targetedVirtual machine:
$ oc adm must-gather --image=registry.redhat.io/migration-toolkit-virtualization/mtv-must-gather-rhel8:2.9.7 \ -- VM=<vm_id> NS=<namespace> /usr/bin/targeted1 - 1
- Specify the VM ID as it appears in the
PlanCR.
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