ZFS Pool Upgrade Question

[cyrus104]

I converted from CORE to SCALE awhile back and got a message to upgrade my pools after they were imported. It said the action was one way and I didn't want to do it at the time because I might go back to CORE. I'm pretty comfortable with SCALE currently and am ready to do the upgrade but wanted to see what actually is changed, benefits / cons / known issues.

I didn't see any info in the web interface to know what is being changed.

Thanks

 

[kian1991]

I am on the same boat as cyrus.

 

[winnielinnie]

I've read it's best to play it safe and skip one-way upgrading a zpool unless you absolutely need a particular feature.

I have yet to figure out an intuitive way to list all the missing features of a specific pool that would be available if you upgrade the pool on the current system.

One thing you can do is list your current system's ZFS capabilities with:
zpool upgrade -v

No changes will be applied with the -v flag.

Then you can compare it to a specific pool's features:
zpool get all mypool | grep feature@

Look for inactive and disabled features.

On CORE, there is no zpool-features command, but it might exist in SCALE?

In short, I still personally prefer to play it safe. You never know when you might need to revert back to an older system.

 

[ornias]

For CORE there often is a writeup whats being changed in the changelog of the respective CORE version, but for SCALE there isn't an official release-changelog yet.

It's also quite technical, but it's safe to say that new ZFS versions are always able to read old pools, but not all new pools can be read/writen by older ZFS versions. Hence iX simplified it by just stating you can't go back.

Thats not really related to a changelog tbh.