Home / server / Questions / 296668
Accepted
ssc
Asked: 2011-08-03 05:59:01 +0800 CST

ZFS on FreeBSD: upgrade from 7.x to 8.2?

  • 772

I set up a ZFS pool of 8 harddrives under FreeBSD 7.2 a couple of years ago. This pool is storing data, the OS itself runs on a separate harddrive with conventional UFS2.

Now I am thinking about upgrading to the latest version FreeBSD 8.2.

Has anyone gone through upgrading ZFS before ? Can I simply export the pool in the 7 installation and then re-import in the new environment ? Or should I expect any complications ?

In other words: Are newer zpool versions backward compatible ?

FreeBSD 8.2 comes with ZFS version 15. I can't seem to find out what version came with 7.2, but IIRC, that was the first major release that supported it all...

freebsd zfs

1 Answers

  1. Best Answer

    An older pool can be imported with no issues on a newer system - it's completely backwards compatible.

    However, it's not forward compatible; once you upgrade to version 15, there's no going back to an older system.

    Use the zpool upgrade command to up the pool's version.

    • 2