On Sep 20, 2007 06:09 -0700, Matthew Ahrens wrote: > Andreas Dilger wrote: > >>I agree, but I suspect large dnodes could also be of use to ZFS at > >>some point, either for fast EAs and/or small files, so we wanted to > >>get some buy-in from the ZFS developers on an approach that would > >>be suitable for ZFS also. In particular, being able to use the larger > >>dnode space for a variety of reasons (more elements in dn_blkptr[], > >>small file data, fast EA space) is much more desirable than a Lustre-only > >>implementation. > > I thought we were just talking about increasing the potential bonus buffer > size. So it is no different than the problem you have today: you need to > encrypt the bonus buffer part of the dnode_phys_t, but not the rest of it.
Well, CFS is only immediately interested in fast XATTR storage using a larger dnode bonus buffer. However, I thought it might be worthwhile to discuss using the dn_blkptr[] array itself for fast small file/symlink storage at the same time. It might be too hard to change that at this time, and I won't shed a tear if that is the case, but it is worth some thought. Bill mentioned you had already tried something similar, so we might discount that idea pretty quickly. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc.
