Forum Discussion

rhpot1991

Guide

Mar 08, 2021

Solved

Enable Bitrot on Files: MV or CP?

So I want to make sure that bitrot protection is enabled on my files, I don't recall if I had it enabled on my shares before files were placed there. According to the documentation you can create a ...

rn_enthusiast
Mar 08, 2021
You can use "lsattr" to check if a file has CoW enabled or not.

Here my txt file does not have CoW enabled, denoted by the "C" in the end.
root@Databak:~# lsattr /data/Data-dump/MyFile_NoCoW.txt ---------------C /data/Data-dump/MyFile_NoCoW.txt
Here is what a file looks like, that has CoW enabled.
root@Databak:~# lsattr /data/Data-dump/MyFile_CoW.txt ---------------- /data/Data-dump/MyFile_CoW.txt
I don't think the "mv" command is enough to trigger CoW on a file that has previously been marked for No CoW - due to reasons that StephenB mentioned. I think you need to re-create the file - i.e. "cp"

But you can check on the files you moved :)

rhpot1991

Guide

Mar 08, 2021

Everything from SSH, could do it via a network share but that would add network overhead.

MV across shares, takes some time - not instant.

MV within shares is instant. (note this was done after above, which may have created metadata?)

CP within a share is taking forever.

Hopefully someone from Netgear can chime in if an initial MV will create the metadata or not.

StephenB

Guru - Experienced User

Mar 08, 2021

rhpot1991 wrote:

Everything from SSH, could do it via a network share but that would add network overhead.

MV across shares, takes some time - not instant.

MV within shares is instant. (note this was done after above, which may have created metadata?)

CP within a share is taking forever.

Hopefully someone from Netgear can chime in if an initial MV will create the metadata or not.

Please don't double-post. I replied here: https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Enable-Bitrot-on-Files-MV-or-CP/m-p/2066796