OpenStack Cinder Block Storage Errors
The Cinder failures that block volumes: no weighed backends available, a volume stuck creating or dropped into error, an image that's unacceptable for the backend, a backup that fails, or an LVM/Ceph backend that won't initialize. Each guide opens with the fix and the `openstack volume`, `cinder-manage`, and backend commands. Pick your error below, or paste the cinder-volume log into the assistant.
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Every guide in this cluster
10 guides-
Cinder 'No weighed backends available' Scheduler Failure
Fix Cinder 'No valid host was found. No weighed backends available': revive dead cinder-volume, pass CapacityFilter, and align volume_backend_name.
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'Volume stuck in creating' and 'failed to attach volume' in Cinder
Cinder volumes stuck in creating or error state, or failing to attach? Diagnose cinder-volume, backend connectivity, scheduler, and iSCSI/multipath root causes step by step.
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Cinder Backup Failed / Stuck in error State
Fix Cinder 'backup failed' / backup stuck in error: diagnose a down cinder-backup service, wrong backup driver, Swift/Ceph store issues, and safely reset a failed backup.
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'Failed to initialize driver' — fix cinder-volume backend startup
Fix cinder-volume 'Failed to initialize driver / Bad or unexpected response from the storage volume backend API': diagnose backend credentials, enabled_backends, and driver deps so the service starts.
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'error connecting to the cluster' — Fix Cinder/Nova Ceph RADOS Timeout
Fix OpenStack 'error connecting to the cluster: Connection timed out' RADOS errors in Cinder and Nova: diagnose Ceph mon reachability, keyring/cephx auth, clock skew, and RBD config in Kolla-Ansible.
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'ImageUnacceptable' Cinder volume-from-image failure
Cinder rejecting a volume create with ImageUnacceptable? Diagnose image size vs volume size, format, and virtual-size mismatches for boot-from-volume step by step.
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'Volume group not found' Cinder LVM backend failure
Cinder LVM driver failing with Volume group cinder-volumes not found? Diagnose missing VG, lost physical volumes, and backend recovery step by step.
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Cinder Volume in 'error' / 'error_deleting' Status
Recover Cinder volumes stuck in error, error_deleting, or error_extending: read cinder-volume logs, fix backend driver faults, and reset-state safely.
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Cinder Quota Usage Out of Sync (Over Quota With No Volumes)
Fix OpenStack Cinder 'VolumeLimitExceeded' quota-sync mismatches: diagnose stale usage rows, reconcile with cinder-manage quota sync, and prevent phantom over-quota.
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Cinder Volume Detach Fails 'device is busy' / Stuck in-use
Fix Cinder volume detach 'device or resource busy' / volume stuck in-use: unmount inside the guest, clear stale attachments, and safely reset-state on a detaching volume.
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Frequently asked questions
What causes "No weighed backends available" in Cinder?
volume_backend_name. Check cinder get-pools --detail and the cinder-scheduler log. See no weighed backends.My volume is stuck in "creating" — how do I recover it?
cinder-manage volume update_host / openstack volume set --state error then delete. See volume stuck creating.