ZFS Pool Version 1

ZFS Pool Version 1

This page describes the features available with version 1 of the ZFS pool on-disk format.  This is the initial ZFS on-disk format as integrated on 10/31/05.  During the next six months of internal use, there were a few on-disk format changes that did not result in a version number change, but resulted in a flag day since earlier versions could not read the newer changes.  The first official releases supporting this version are:

• Nevada, build 36
• Solaris 10 6/06 release

Earlier releases may not support this version, despite being formatted with the same on-disk number.  This is due to:

• 6389368 fat zap should use 16k blocks (with backwards compatibility)

• 6390677 version number checking makes upgrades challenging