When terminating a volume, openstack default overwrites the complete volume with zero’s for security reasons. This can take a long time, especially with large volumes.
If security isn’t an issue in your environment, you can speed-up deletion to only overwrite the first 1GB with zero’s, which will then delete only the mbr, partition table and the first part of the filesystem. See this post ( https://dijks.wordpress.com/2012/07/09/how-to-speedup-removal-of-a-volume/) for a brief tutorial to speed-up removal of a volume if security isn't an issue.
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