Datastore warning

I setup the vcenter to alert for datastore warning if the free space reach the threshold value. I used to get warning if the space reach near capacity .
Today one of the storage went to zero free space but I did not get warning on a datastore or exclamation mark on it despite zero free space.
I see an exclamation mark on an another datastore .
Why I did not get the alert on this datastore?
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sara2000Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
it filled up too fast! depends on how you've setup your alerts, there should have been two triggered, depending how you've set them.

yellow and red!

without looking at how you've setup alarms, and configuration, and the event and what happened, difficult to really identify why.

what filled up the datastore ?

Snapshot ?
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sara2000Author Commented:
VMs has snapshot on. and each vm with 16GB memory.
Can this be the combination of swap file and snapshots?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
this would fill the datastore.
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