9:59am, Richard Elling wrote:

On Apr 25, 2012, at 5:48 AM, Paul Archer wrote:

      This may fall into the realm of a religious war (I hope not!), but 
recently several people on this list have
      said/implied that ZFS was only acceptable for production use on FreeBSD 
(or Solaris, of course) rather than Linux
      with ZoL.

      I'm working on a project at work involving a large(-ish) amount of data, 
about 5TB, working its way up to 12-15TB

This is pretty small by today's standards.  With 4TB disks, that is only 3-4 
disks + redundancy.

True. At my last job, we were used to researchers asking for individual 4-5TB filesystems, and 1-2TB increases in size. When I left, there was over a 100TB online (in '07).

      eventually, spread among a dozen or so nodes. There may or may not be a 
clustered filesystem involved (probably
      gluster if we use anything).

I wouldn't dream of building a clustered file system that small. Maybe when you 
get into the
multiple-PB range, then it might make sense.

The point of a clustered filesystem was to be able to spread our data out among all nodes and still have access from any node without having to run NFS. Size of the data set (once you get past the point where you can replicate it on each node) is irrelevant.

      I've been looking at ZoL as the primary filesystem for this data. We're a 
Linux shop, so I'd rather not switch to
      FreeBSD, or any of the Solaris-derived distros--although I have no 
problem with them, I just don't want to
      introduce another OS into the mix if I can avoid it.

      So, the actual questions are:

      Is ZoL really not ready for production use?

      If not, what is holding it back? Features? Performance? Stability?

The computer science behind ZFS is sound. But it was also developed for Solaris 
is quite different than Linux under the covers. So the Linux and other OS ports 
have issues
around virtual memory system differences and fault management differences. This 
is the
classic "getting it to work is 20% of the effort, getting it to work when all 
else is failing is
the other 80%" case.
 -- richard

I understand the 80/20 rule. But this doesn't really answer the question(s). If there weren't any major differences among operating systems, the project probably would have been done long ago.

To put it slightly differently, if I used ZoL in production, would I be likely to experience performance or stability problems? Or would it be lacking in features that I would likely need?
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