We detected minor technical issues on our storage cluster, resulting in a few servelets experiencing I/O read/write issues. We have isolated and identified the root cause of the problem, and we have fixed the problem as of 4 October 2019. We are currently monitoring the storage cluster closely.
If your servelet is affected by the problem, rebooting / restarting the servelet will resolve the problem.
We apologise for the inconvenience caused.