Hi @Jhon Herrera ,
IOPS means I/O per second (Input/Output operations per second). It's not a capacity value but a performance measure.
Refer: https://en.wikipedia.org/wiki/IOPS
If the max. IOPS rate of a disk is reached nothing happens to the VM like a restart or shutdown. At max IOPS the disk reads/writes as fast as possible but maybe this operations are delayed because the disk can't process the read/write fast enough.
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Regards
Andreas Baumgarten