Joe S writes:
> After researching this further, I found that there are some known
> performance issues with NFS + ZFS. I tried transferring files via SMB, and
> got write speeds on average of 25MB/s.
>
> So I will have my UNIX systems use SMB to write files to my Solaris server.
> This seems weird, but its fast. I'm sure Sun is working on fixing this. I
> can't imagine running a Sun box with out NFS.
>
Call be a picky but :
There is no NFS over ZFS issue (IMO/FWIW).
There is a ZFS over NVRAM issue; well understood (not related to NFS).
There is a Samba vs NFS issue; not well understood (not related to ZFS).
This last bullet is probably better suited for
[EMAIL PROTECTED]
If ZFS is talking to storage array with NVRAM, then we have
an issue (not related to NFS) described by :
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6462690
6462690 sd driver should set SYNC_NV bit when issuing SYNCHRONIZE CACHE
to SBC-2 devices
The above bug/rfe lies in the SD driver but very much
triggered by ZFS particularly running NFS, but not only. It
affects only NVRAM based storage and is being worked on.
If ZFS is talking to a JBOD, then the slowness is a
characteristic of NFS (not related to ZFS).
So FWIW on JBOD, there is no ZFS+NFS "issue" in the sense
that I don't know how we could change ZFS to be
significantly better at NFS nor do I know how to change NFS
that would help _particularly_ ZFS. Doesn't mean there is
none, I just don't know about them. So please ping me if you
highlight such an issue. So if one replaces ZFS by some other
filesystem and gets large speedup I'm interested (make sure
the other filesystem either runs with write cache off, or
flushes it on NFS commit).
So that leaves us with a Samba vs NFS issue (not related to
ZFS). We know that NFS is able to create file _at most_ at
one file per server I/O latency. Samba appears better and this is
what we need to investigate. It might be better in a way
that NFS can borrow (maybe through some better NFSV4 delegation
code) or Samba might be better by being careless with data.
If we find such an NFS improvement it will help all backend
filesystems not just ZFS.
Which is why I say: There is no NFS over ZFS issue.
-r
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