Performance history data graphs gone after shutdown

[4erp6uv]

Hi there,

I have a readynas 4312 to which I just logged in as admin.

I was asked to get some utilization graphs about the NAS and I found it under the Performance Icon, however since this unit was shutdown a week ago it is not showing any performance-utilization data beyond that date..

is there a way to recover that data to be able to see the whole picture?

Thank you very much in advance.

[Sandshark]

I have had data available after a shut-down on some occasions and not on others.  I have yet to figure out why, but it appears it is intended to be retained for at least some period of time. 

I can tell you it's all in one file (per item, I think), so if it's not displaying, it's gone.