Michael Monnerie wrote: > On Dienstag, 31. August 2010 Eric Sandeen wrote: >> Just be sure your first sector of your top-level block device >> is 4k aligned, and then yes you'll want to set sector size to 4k >> so that xfs will do all log IO in 4k blocks as well. > > I can only hope LVM does it right, I have no idea how it aligns. > >> If you do it right (and especially vs. if you do it wrong) it should >> be a bit faster if all IOs are 4k aligned on the disk. > > And that's what's interesting me: why? Won't XFS do all I/Os at minimum > for a given block size? Or is it possible XFS does write only a single > sector? I'd expect the smallest I/O size to be the block size, but it > seems I'm wrong? the log can do things on sector size boundaries. > I guess there's no way to "convert" an existing XFS with > sectsz=512,bsize=4096 to sectsz=4096,bsize=4096? Maybe that's only a > flag that can be changed? I don't think so ... -Eric _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
