Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-ig0-f182.google.com ([209.85.213.182]:54873 "EHLO mail-ig0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753990AbaDWVDk (ORCPT ); Wed, 23 Apr 2014 17:03:40 -0400 Received: by mail-ig0-f182.google.com with SMTP id uy17so97541igb.3 for ; Wed, 23 Apr 2014 14:03:39 -0700 (PDT) MIME-Version: 1.0 Date: Wed, 23 Apr 2014 23:03:39 +0200 Message-ID: Subject: NFSv4 delegations criteria? Fwd: Tuning Linux NFSv4 for high latency connections? From: Cedric Blancher To: Linux NFS Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: What are the criteria for grating a file delegation in NFSv4? Are file delegations retained even if a process closes a file and the next process in the chain opens it again (e.g. in a shell script)? Ced PS: Who again grants NFSv4 delegations? Server or client? Do delegations work when data are appended at the end of a file? ---------- Forwarded message ---------- From: Cedric Blancher Date: 23 April 2014 20:01 Subject: Tuning Linux NFSv4 for high latency connections? To: Linux NFS Mailing List Are there any options to improve the Linux NFSv4 performance over a high latency connection? We currently use Solaris/Illumos as NFSv4 server and client over a cross continental Internet connection. Latency is terrible (~220ms) but the counter this by running work in parallel so the latency is mostly mitigated. We now wish to migrate (short: Away from Oracle because support is basically unbearable) to Linux (tested SuSE 13.1 and current Fedora) and build times are 17 times (!!!) SLOWER than on Solaris/Illumos. Are there any tunables besides actimeo=300? Ced -- Cedric Blancher Institute Pasteur -- Cedric Blancher Institute Pasteur