I would imagine that linux to behave more like ZFS that does not flush caches. (google Evil zfs_nocacheflush).
If you can nfs tar extract files on linux faster than one file per rotation latency; that is suspicious. -r Le 26 févr. 08 à 13:16, msl a écrit : >> For Linux NFS service, it's a option in >> /etc/exports. >> >> The default for "modern" (post-1.0.1) NFS utilities >> is "sync", which means that data and metadata will be >> written to the disk whenever NFS requires it >> (generally upon an NFS COMMIT operation). This is >> the same as Solaris with UFS, or with ZFS+ZIL. This >> works with XFS, EXT3, and any other file system with >> a working fsync(). > Ok, i did know that, i have forgot to mention in my question that my > doubt was if Linux would "really" honour the sync. Do you > understand? I did read that Linux "does not" (even with sync in > exports). In nfsv2 for example, does not matter if you put sync or > async, the server will ACK as soon as it receives the request (NOP). > But if you are telling that *now* Linux is really syncing discs > before ACK the client, well... so there is a huge diff on zfs/nfs > and xfs/nfs, because the numbers that i have posted is with "sync" > on Linux. >> >> It's possible to switch this off on Linux, but not >> recommended, as there is a chance that data could be >> lost if the server crashed. (For the same reason, the >> ZIL should not be disabled on a Solaris NFS server.) > I understand that, so i did not even try to disable ZIL until now. > All the tests that i have made was respecting a semantically correct > NFS service. If the ZIL could be configured per filesystem, or pool... > The diff is 7.5s to 1.0s, and theoretically zfs is more efficient > than xfs. > > > This message posted from opensolaris.org > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
