> On Wed, Mar 28, 2007 at 06:55:17PM -0700, Anton B. > Rang wrote: > > It's not defined by POSIX (or Solaris). You can > rely on being able to > > atomically write a single disk block (512 bytes); > anything larger than > > that is risky. Oh, and it has to be 512-byte > aligned. > > > > File systems with overwrite semantics (UFS, QFS, > etc.) will never > > guarantee atomicity for more than a disk block, > because that's the > > only guarantee from the underlying disks. > > I thought UFS and others have a guarantee of > atomicity for O_APPEND > writes vis-a-vis other O_APPEND writes up to some > write size. (Of > course, NFS does not have true O_APPEND support, so > this wouldn't apply > to NFS.)
That's mainly what I was thinking of, since the overwrite case would get more complicated. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
