On Feb 27, 2008, at 8:36 AM, Uwe Dippel wrote:
> As much as ZFS is revolutionary, it is far away from being the
> 'ultimate file system', if it doesn't know how to handle event-
> driven snapshots (I don't like the word), backups, versioning. As
> long as a high-level system utility needs to be invoked by a
> scheduler for these features (CDP), and - this is relevant - *ZFS
> does not support these functionalities essentially different from
> FAT or UFS*, the days of ZFS are counted. Sooner or later, and I bet
> it is sooner, someone will design a file system (hardware, software,
> Cairo) to which the tasks of retiring files, as well as creating
> versions of modified files, can be passed down, together with the
> file handlles.
meh .. don't believe all the marketing hype you hear - it's good at
what it's good at, and is a constant WIP for many of the other
features that people would like to hear .. but the "one ring to rule
them all" - not quite yet ..
as for the CDP issue - i believe the event driving would really have
to happen below ZFS at the vnode or znode layer .. keep in mind that
with the ZPL we're still dealing with 30+ year old structures and
methods (which is fine btw) in the VFS/Vnode layers .. a couple of
areas i would look at (that i haven't seen mentioned in this
discussion) might be:
- fop_vnevent .. or the equivalent (if we have one yet) for a znode
- filesystem <-> door interface for event handling
- auditing
if you look at what some of the other vendors (eg: apple/timemachine)
are doing - it's essentially a tally of file change events that get
dumped into a database and rolled up at some point .. if you plan on
taking more immediate action on the file changes then i believe that
you'll run into latency (race) issues for synchronous semantics
anyhow - just a thought from another who is constantly learning (being
corrected, learning some more, more correction, etc ..)
---
.je
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