last month our new FAS3270 was installed. The system is still in test stage at present, but it shall be used productively soon
The FAS3270 is fitted with a 512GB Flash Cache Card. We've got no experiencies with this card and it's performance, therefore we are testing. Under consideration of "TR-3832 Flash Cache Best Practices Guide" we created different volumes (with identical parameters - priority set volume volumename cache=keep) , declared as LUNs and CIFS-Shares. Now we began copy data from LUN to LUN, from CIFS-share to CIFS-share and so on.
With "stats show -p flexscale-access" we can see (Hit /s and Hit %) that the Flash Card is used by read access with volumes witch are created as LUNs. But it looks like the Cache is not used by read access with CIFS-Shares.
Copy data: LUN to LUN
Copy - the same - data: CIFS-Share to CIFS-Share
Yes, we 've copied the dataset (5GB - with 5.166 files of different size) more than one time. To test the performance, we copy the datasets repeatedly at different times. By using LUNs it looks fine, by CIFS-Shares - no cache access.