SU+J on 9.1-RC2 ISO

Adam Strohl adams-freebsd at
Sun Nov 4 10:20:50 UTC 2012

On 11/3/2012 1:31, Mateusz Guzik wrote:
> Currently when you try to take a snapshot, the kernel checks whether SUJ
> is enabled on specified mount-point, and if yes it returns EOPNOTSUPP.
> See this commit (MFCed as r230725):

Ahhh excellent to hear. I partition manually these days with 9.0-R 
because most servers are either using gmirror, which I want setup before 
the install, or a RAID card which means partitions need to be aligned to 
the stripe boundaries.  So I just "newfs -U -L" and keep journaling off 
and wouldn't have realized there is at least some mitigation that will 
make it into 9.1-R.

I still stand by my feeling that it should not be on by default though, 
because it breaks snapshots and by extension dump -L which I consider to 
be a pretty awesome feature of FreeBSD.  If you have partitions with 
enabled it means booting up in single user to undo it which is a hassle 
for a server if it's in production (I realize that's a bit whiny :P).

Adam Strohl

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