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.) Nico -- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
