If the VM is migrated from one data store to other data store, Is there any performance impact on other VM’s which are in same data store?
well this is not that easy to explain.
it's depending on the available I/O.
- do you have local Datastores?
- if non-local > you have FC/iscsi/nfs ?
- you have different Raid for the Datastores? Which Kind of Raid? (Raid1/5/6,....) How much Disk Slices you have inside the Raid?
you need to be aware that you have read I/O on the Source Datastore and write I/O on the Destination. and this is additional next to you're running Vm's
i would jump on the esxi console and checking esxtop. there you see best if the datastores having any Latency Issues. you could do then a Test-Svmotion outside of Business Times
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