topic Re: Incremental robocopy to Netapp detects all existing files as changed or modified in ONTAP Discussions

Incremental robocopy to Netapp detects all existing files as changed or modified

Bibinraj — Tue, 09 Oct 2018 10:48:33 GMT

We are migrating around 30 TB data from windows based file server to Netapp CIFS share by using robocopy command with /MIR switch.

After completing the baseline copy we are experiencing issues with incremental copy to Net app. Incremental robocopy to Netapp detects all existing files as changed or modified.

When i try the same command from windows as a source and another windows share as a destination, it copies only files those are changed or modified. It looks like some issue with Netapp.

Robocopy command I am using

robocopy <Windows Source> <Netapp Destination> /mir /copyall /ZB /w:1 /r:1 /log:D:\Robocopy-Logs\test.txt /TEE

robocopy <Windows Source> <Windows Destination> /mir /copyall /ZB /w:1 /r:1 /log:D:\Robocopy-Logs\test.txt /TEE

Did anyone experience same issue ?

Thanks

Bibin

Re: Incremental robocopy to Netapp detects all existing files as changed or modified

JGPSHNTAP — Tue, 09 Oct 2018 12:11:43 GMT

What vesion are you using on Ontap. We migrated 100s of TB's using robocopy and never had an issue.

You're flags look good, can you post a small portion of the log

Re: Incremental robocopy to Netapp detects all existing files as changed or modified

Bibinraj — Tue, 09 Oct 2018 12:37:18 GMT

Thank you so much for your quick response

I am using NetApp Release 9.3P4

I found this workworkaround from Netapp community but we dont have Windows 2008 server in production.
https://community.netapp.com/t5/Data-ONTAP-Discussions/Fileserver-Migration-with-robocopy/td-p/118615

I have attached the snap shot copy of the logs from Windows to Windows & Windows to Netapp copy

Thanks

Bibin

Re: Incremental robocopy to Netapp detects all existing files as changed or modified

Bibinraj — Tue, 09 Oct 2018 13:02:19 GMT

This solution may fix the issue but not sure it creates any other issues.

http://www.noelis.be/?p=173

Re: Incremental robocopy to Netapp detects all existing files as changed or modified

Bibinraj — Thu, 11 Oct 2018 10:51:32 GMT

It is a bug with Netapp --- Bug ID 1105968

https://mysupport.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=1105968

also noticed that

Incremental copy detects all existing files as changed or modified but it took less time to complete the second copy process. May be it is updating only access control list (ACL).

Re: Incremental robocopy to Netapp detects all existing files as changed or modified

JGPSHNTAP — Thu, 11 Oct 2018 11:18:29 GMT

Thanks for th e information, we are going to try to reproduce in our lab

Re: Incremental robocopy to Netapp detects all existing files as changed or modified

Greg_Wilson — Wed, 03 Nov 2021 11:58:33 GMT

Did you suss this out.. we are doing a migration to 9.9.1P4 and it’s copying everything again on the second sync…