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fix(tools): ride out cloud errors while taking a snapshot - #63
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A single server error from Nova while waiting for an instance to stop failed the whole snapshot. Starting the instances back then asked Nova to start one it was still stopping, which it refused, and that error left the remaining instances down. The reads now ask again while the cloud fails to answer. The waits hold until Nova is done with an instance rather than on a status. Starting back waits for a stop still under way, and goes on with the other instances when one of them fails.
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A single server error from Nova while waiting for an instance to stop failed the whole snapshot. Starting the instances back then asked Nova to start one it was still stopping, which it refused, and that error left the remaining instances down.
The reads now ask again while the cloud fails to answer. The waits hold until Nova is done with an instance rather than on a status. Starting back waits for a stop still under way, and goes on with the other instances when one of them fails.