On Wed, Mar 13, 2013 at 02:11:19PM -0400, Dave Hall wrote: > Does xfs_fsr react in any way to the sunit and swidth attributes of > the file system? Not directly. > In other words, with an XFS filesytem set up > directly on a hardware RAID, it is recommended that the mount > command be changed to specify sunit and swidth values that reflect > the new geometry of the RAID. The mount option does nothing if sunit/swidth weren't specified at mkfs time. sunit/swidth affect the initial layout of the filesystem, and that cannot be altered after the fact. Hence you can't arbitrarily change sunit/swidth after mkfs - you are limited to changes that are compatible with the existing alignment. If you have no alignment specified, then there isn't a new alignment that can be verified as compatible with the existing layout..... > In my case, these values were not > specified on the mkfs.xfs of a rather large file system running on a > RAID 6 array. Which means the mount option won't work. > I am wondering adding sunit and swidth parameters to > the fstab will cause xfs_fsr to do anything different than it is > already doing. Most importantly, will it improve performace in any > way? It will make no difference at all. A more important question: why do you even need to run xfs_fsr? Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
