XFS - Changing sunit and swidth

[Joshua Schmidlkofer <kernel@xxxxxxxxxxxxxx>]

The mount man page lists the ability to change the sunit and swidth via 
mount options.

Is that the case?  Does it work?   I will Use The Source(tm) if no one 
wants to answer.  However, everyone keeps reiterating the complexity of 
XFS, and maybe someon knows.


Here are my current mount options.

/dev/sda1               /snapshots      xfs 
noatime,nodiratime,logbufs=8,sunit=16,swidth=48 0 0


Here is xfs_info:
meta-data=/snapshots             isize=256    agcount=32, agsize=4577708 
blks
         =                       sectsz=512
data     =                       bsize=4096   blocks=146486656, imaxpct=25
         =                       sunit=0      swidth=0 blks, unwritten=1
naming   =version 2              bsize=4096
log      =internal               bsize=4096   blocks=32768, version=1
         =                       sectsz=512   sunit=0 blks
realtime =none                   extsz=65536  blocks=0, rtextents=0


-----------


I don't see any change in sunit nor swidth.   The previous admin did not 
know about XFS options for arrays.

thanks,
 Joshua