How to find Volume data change rate in Cluster dataontap for last 2 weeks

[PnaveenKumar]

There is a requirement in my organization to find the data change rate on all the volumes in a cluster. Can someone help me to find a way to do it? I need data change rate in MB's.

[smichae1]

For this type of reporting you may want to look into some of the OnCommand products. OnCommand Insight (OCI) has a powerful reporting suite called OnCommand Insight Data Warehouse, which utilizes an IBM Cognos reporting engine to allow creation of complex reports that can be scheduled. I would recommend having a look at OCI to see if it is something you are interested in.

[PnaveenKumar]

@smichae1 

Sorry, we have not deployed OCI in my environment. Is there any other way we can do this?

[smichae1 · Accepted solution]

I don't believe that particular metric is available pre-calculated in OnCommand Unified Manager or System Manager. However, if you wanted to throw together a custom solution you could have a look at the "NetApp Harvest" data collector, which can be found in the ToolChest section of the support site. You would need to setup OnCommand Unified Manager to collect capacity information from your clusters, and setup Harvester to retrieve those from UM to be stored in a time series database. From there you could interpret the data however you want.

You could also contact an account or sales representative to explore options for having our Professional Services team assist with this type of setup.

[Ontapforrum]

In addition to what experts have already said, this could be useful:

Not exactly what you need but may be handy: If you have OCUM monitoring your NetApp Storage (OCUM is free), then there are some useful reports , one such is - Volumes Capacity Growth report, that can give you an idea about 'Dialy growth rate (GB)' and 'Daily Growth rate (%)' along with 'Days to full' across all the cDOT/SVMs/Volumes. You can export this report in CSV/pdf/excel to email. Then sort it out for specific cDOT in excel. This could give you some idea about all the volume's growth rate.

Apart from this, if you are interested to know the growth of specific volume, (It'a manual task, don't know if there is another alternative) then good old 'snap-delta' is handy.

You can use 'snap-delta' command to view the rate of change between two Snapshot copies as well as the rate of change between a Snapshot copy and the active file system.

https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-cm-cmpr-940%2Fvolume__snapshot__show-delta.html

SANCL1::> volume snapshot show-delta -volume nfs_prod -vserver svm01 -snapshot1 Prod_09-10-2019_22.30.02.6379 -snapshot2 Prod_09-03-2019_22.30.02.3686
A total of 41450881024 bytes (10119844 blocks) are different. Elapsed time between the Snapshot copies: 7d 3s.
SANCL1::>

                                                                         KB      MB     GB
Bytes to GB = 41450881024 bytes /1024/1024/1024 = 38.6GB

                                                                        MB    GB
Blocks to GB = 10119844 x 4KB /1024/1024 = 38.6GB

In the above example : approximately 39GB of data changed between the two snapshots in week's time.

In your case, you can do snap-delta between active-file-system and the 'snapshot which is 2 weeks back' and know the rate of change of data for that volume and repeat the same.