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. -- richard ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance Las Vegas, April 29-30, 2010 http://nexenta-vegas.eventbrite.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
