On Mon, Jul 07, 2014 at 06:24:41PM +0200, Cedric Blancher wrote: > Anyone? > > Ced > > On 23 April 2014 23:03, Cedric Blancher <cedric.blancher@xxxxxxxxx> wrote: > > What are the criteria for grating a file delegation in NFSv4? They're generally implementation-specific. > > 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)? Yes, they can be. > > > > Ced > > > > PS: Who again grants NFSv4 delegations? Server or client? The server. > > Do > > delegations work when data are appended at the end of a file? The holder of a write delegation can append, yes. The rfc's (3530 and 5661) have some more details. I suspect the Solaris server supports write delegations. The Linux server doesn't. Hard to tell the reason for the performance difference you describe, though, you'd probably need to gather some statistics. --b. > > > > ---------- Forwarded message ---------- > > From: Cedric Blancher <cedric.blancher@xxxxxxxxx> > > Date: 23 April 2014 20:01 > > Subject: Tuning Linux NFSv4 for high latency connections? > > To: Linux NFS Mailing List <linux-nfs@xxxxxxxxxxxxxxx> > > > > > > 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 <cedric.blancher@xxxxxxxxx> > > Institute Pasteur > > > > > > -- > > Cedric Blancher <cedric.blancher@xxxxxxxxx> > > Institute Pasteur > > > > -- > Cedric Blancher <cedric.blancher@xxxxxxxxx> > Institute Pasteur > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
