Vcenter 5.5 and Performance data on datastores

We are trying to get Performance data from Datastoresolder than a day , and the error comes up :
Data is not collected for the current statistics level. Increase the Statistics level to view the graphs

Other Performance graphs works for the Cluster / hosts ...etc for older than a day > thats no problem
Perfromance graphs > view for Space on datastores can go back older than a year
Performace Graphs > View for Performance on datastores cannot and display error as mentioned

I have read that the Storage I/O control needs to be enabled for this , but as soon as I to this (try and enable it ) this error comes up
License not available to perform the operation
The VMware vSphere 5 Enterprise license for Host BLAH BLAH does not include vSphere Storage I/O Control. Upgrade the license.

so
1. Am I on the right track ?
2. Which License to I require ?
JakesCAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
1. Increase the Statistics level to view the graphs. This is a setting in vCenter Server.

2. Storage I/O control is something completely different, and improves performance, with your storage, and for that function you need an Enterprise PLus license.

Yes, you can upgrade,. it's just a change of license.

https://www.vmware.com/uk/products/vsphere/features/storage-io-control

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JakesCAuthor Commented:
Hi there

Currently the Statistics level for all is set to 1

Plus going to the Host performance tab and running stats we can go back a year of stats
But this is only the Data store >  performance only realtime shows and nothingolder than that
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, that's correct, increase the level.
JakesCAuthor Commented:
none
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