DragonFlyBSD

:for example:
:I have a volume:
: newfs_hammer -L Home /dev/ad0s1d
: mount_hammer /dev/ad0s1d /home
:now I want to extends it:
: newfs_hammer -L Home /dev/ad1s1d
: mount_hammer /dev/ad0s1d /home
:The data in /home is kept and the volume capacity is extended.
:
:Can HAMMER do or will do this?

Not in this first release.  The data structures are designed to
    make it fairly easy to do, though, and eventually it will
    be possible to add and remove volumes and expand and contract 
    partitions.

-Matt
                    Matthew Dillon 
                    <dillon@backplane.com>

Your mean is that HAMMER will support the feature in furture.
And it will do most as solaris zfs do?

:Your mean is that HAMMER will support the feature in furture.
:And it will do most as solaris zfs do?

It will support the feature in the future, yes.  HAMMER isn't ZFS
    so I doubt it will do most of what ZFS does, nor would ZFS do most
    of what HAMMER does.  RAID mechanics are best left to another layer,
    HAMMER's approach to redundancy will be by using replication.

-Matt
                    Matthew Dillon 
                    <dillon@backplane.com>

I mean is that HAMMER eventually will like zfs file system or do
better than zfs.
Surely HAMMER is HAMMER,zfs is zfs,they are different.
I expect HAMMER will do better than zfs and be ported to FreeBSD.