Test connection speed between NetApp ONTAP 9.3+ and Windows Client

Today I wanna show you, how to perform a speed test between a Windows Client and your NetApp filer.

Logon to your NetApp filer using SSH.

Set priv to advanced:
netapp::> set -privilege advanced

Warning: These advanced commands are potentially dangerous; use them only when
         directed to do so by NetApp personnel.
Do you want to continue? {y|n}: y
netapp::> y


Start iperf server:
netapp::*> network test-link  start-server


Install and run iperf on Windows:
- Logon into the Windows client
- Download iperf3 and extract it
  https://iperf.fr/en/iperf-download.php#windows
- browse to iperf3.exe and run
  iperf -c serveripaddress


Example execution and output:
iperf3.exe -c 10.1.1.10
Connecting to host 10.4.248.156, port 5201
[  4] local 10.2.1.2 port 61373 connected to 10.1.1.10 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  91.2 MBytes   762 Mbits/sec
[  4]   1.00-2.00   sec  88.1 MBytes   742 Mbits/sec
[  4]   2.00-3.00   sec  99.6 MBytes   835 Mbits/sec
[  4]   3.00-4.00   sec  95.6 MBytes   802 Mbits/sec
[  4]   4.00-5.00   sec  95.1 MBytes   798 Mbits/sec
[  4]   5.00-6.00   sec  94.1 MBytes   790 Mbits/sec
[  4]   6.00-7.00   sec  92.9 MBytes   779 Mbits/sec
[  4]   7.00-8.00   sec  93.2 MBytes   782 Mbits/sec
[  4]   8.00-9.00   sec  94.8 MBytes   795 Mbits/sec
[  4]   9.00-10.00  sec  91.2 MBytes   765 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec   936 MBytes   785 Mbits/sec                  sender
[  4]   0.00-10.00  sec   936 MBytes   785 Mbits/sec                  receiver

iperf Done.


Stop iperf server on NetApp:
netapp::*> network test-link  stop-server

Restore files from previous versions including all file information

In the following post we will use Robocopy to restore files from previous version including all file information like attributes, timestamps, NTFS ACLs etc

The most admins just move the files from previous versions and lose the original file information.

If files were encrypted our deleted you can use the following method to restore your files, including all information, if shadow copies was configured!

First we need to get the path of the previous version:

Than we could run the following command to restore our files:
robocopy "\\fileserver\c$\data001\@GMT-2019.11.28-11.06.38\testtree" "\\fileserver\c$\data001\testtree" /E /COPYALL /DCOPY:T

Explanation of the switches used in robocopy:
Copy directory recursively (/E)

Copy all file information (/COPYALL, equivalent to /COPY:DATSOU, D=Data, A=Attributes, T=Timestamps, S=Security=NTFS ACLs, O=Owner info, U=Auditing info)

Preserve original directories Timestamps (/DCOPY:T).

How to find largest files using Powershell

If your hard drive is running out of space, you need to know which files causing this issue!

To establish this we will use Get-ChildItem.

Use the following command to get the top three files.

Get-ChildItem -r| sort -descending -property length | select -first 3 name, Length

The Length will be displayed in Bytes, if you have large files it´s better to display it in Mega Bytes, so let´s calculate the responding property length into MB.

Get-ChildItem -r|sort -descending -property length | select -first 3 name, @{Name="Megabytes";Expression={[Math]::round($_.length / 1MB, 2)}}

Now we get all files, where are these files located? Just select DirectoryName as well, to get it.

Get-ChildItem -r|sort -descending -property length | select -first 3 name, DirectoryName, @{Name="Megabytes";Expression={[Math]::round($_.length / 1MB, 2)}}