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f45465b9f6
After PR https://github.com/scylladb/scylladb/pull/28396 reduced the test volumes to 20MiB to speed up test_out_of_space_prevention.py, keeping the original 0.8 critical disk utilization threshold can make the tests flaky: transient disk usage (e.g. commitlog segment churn) can push the node into ENOSPC during the run. These tests do not write much data, so reduce the critical disk utilization threshold to 0.5. With 20MiB volumes this leaves ~10MiB of headroom for temporary growth during the test. Fixes: https://github.com/scylladb/scylladb/issues/28463 Closes scylladb/scylladb#28593
Extension of the cluster tests, where all tests require externally mounted volumes to be used by scylla cluster nodes. The volumes are passed with --workdir.
The volumes can be of any size. A help generator space_limited_servers is provided
to easily create a cluster of any given number of nodes, where each node operates in
a separate volume.