On Mar 31, 2010, at 10:25 PM, Richard Elling
<richard.ell...@gmail.com> wrote:
On Mar 31, 2010, at 7:11 PM, Ross Walker wrote:
On Mar 31, 2010, at 5:39 AM, Robert Milkowski <mi...@task.gda.pl>
wrote:
On Wed, Mar 31, 2010 at 1:00 AM, Karsten Weiss
Use something other than Open/Solaris with ZFS as an NFS
server? :)
I don't think you'll find the performance you paid for with ZFS and
Solaris at this time. I've been trying to more than a year, and
watching dozens, if not hundreds of threads.
Getting half-ways decent performance from NFS and ZFS is impossible
unless you disable the ZIL.
Well, for lots of environments disabling ZIL is perfectly
acceptable.
And frankly the reason you get better performance out of the box
on Linux as NFS server is that it actually behaves like with
disabled ZIL - so disabling ZIL on ZFS for NFS shares is no worse
than using Linux here or any other OS which behaves in the same
manner. Actually it makes it better as even if ZIL is disabled ZFS
filesystem is always consisten on a disk and you still get all the
other benefits from ZFS.
What would be useful though is to be able to easily disable ZIL
per dataset instead of OS wide switch.
This feature has already been coded and tested and awaits a formal
process to be completed in order to get integrated. Should be
rather sooner than later.
Well being fair to Linux the default for NFS exports is to export
them 'sync' now which syncs to disk on close or fsync. It has been
many years before they exported 'async' by default. Now if Linux
admins set their shares 'async' and loose important data then it's
operator error and not Linux's fault.
If apps don't care about their data consistency and don't sync
their data I don't see why the file server has to care for them. I
mean if it were a local file system and the machine rebooted the
data would be lost too. Should we care more for data written
remotely then locally?
This is not true for sync data written locally, unless you disable
the ZIL locally.
No, of course if it's written sync with ZIL, it just seems over
Solaris NFS all writes are delayed not just sync writes.
-Ross
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