ironic-python-agent/releasenotes/notes/4k-block-size-config-drives...

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---
fixes:
- |
Fixes a failure case where a deployed instance may be unable to access
the configuration drive post-deployment. This can occur when block
devices only support 4KB IO interactions. When 4KB block IO sizes
are in use, the ISO9660 filesystem driver in Linux cannot be used
as it is modeled around a 2KB block. We now attempt to verify, and
rebuild the configuration drive on a FAT filesystem when we cannot
mount the supplied configuration drive. Operators can force the agent
to write configuration drives using the FAT filesystem using the
``[DEFAULT]config_drive_rebuild`` option.