Checksums on external hard drives from ZFS pool

[rangopango]

If I have a ZFS pool, how do I make sure the data from my pool is the same on my external drive that's running NTFS?

 

[garm]

By calculating checksums and compare them

https://www.freebsd.org/cgi/man.cgi....1-RELEASE+and+Ports&arch=default&format=html

 

[rangopango]

Is it possible to download the checksum file from a ZFS pool and run it on Windows?

 

[garm]

There is no such file, ZFS checksums is a filesystem feature on block level. The values are stored as block metadata. If you want to manually check data integrity you need to calculate each files checksum and compare.

 

[rangopango]

Wouldn't it take several years, if not, decades ? I have over a billion files.. is there not a way to extract the checksum?

 

[garm]

ZFS checksums blocks, even if you could extract it, what would you do with it on a different filesystem with different blocks?

https://en.wikipedia.org/wiki/ZFS

 

[rangopango]

To make sure the data on my backup drive with a different filesystem matches the data from my server running ZFS

 

[garm]

How do you imagine doing this? What is your usecase?

 

[rangopango]

I don't know how to do it, that's why I want to know if it's possible. :)