nova/releasenotes/notes/bug-1801702-c8203d3d55007de...

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---
fixes:
- |
When testing whether direct IO is possible on the backing storage
for an instance, Nova now uses a block size of 4096 bytes instead
of 512 bytes, avoiding issues when the underlying block device has
sectors larger than 512 bytes. See bug
https://launchpad.net/bugs/1801702 for details.