On Thu, Apr 22, 2010 at 02:06:47PM -0700, nate wrote: > Ray Van Dolson wrote: > > > The "delayed allocation" features in ext4 (and xfs, reiser4) sound > > interesting. Might give a little performance boost for synchronous > > write workloads.... > > Doesn't delayed allocation defeat the purpose of a synchronous write? I don't know for sure. From reading, it sounds like as far as data integrity is concerned it would fall somewhere between complete write-through synchronous writes and asynchronous writes. > I think what you want is a proper storage array with mirrored write > cache. Which is what we have with ZFS + SSD-based ZIL for far less money than a NetApp. This[1] sounds interesting... Ray [1] http://lkml.org/lkml/2010/4/5/41