From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dexter Filmore Subject: copying data over NFS to raid5 array is jumpy Date: Wed, 17 May 2006 23:38:03 +0200 Message-ID: <200605172338.03486.Dexter.Filmore@gmx.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids copying from a local standalone disk to a raid5 array works smooth at a constant 30MB/s. So far, so good. Now, copying data from a machine on the network over 100MBit NFS is kinda jerky. It works, but within a second or two, the transfer rate reported goes from a few 100k/s up to 22MB/s (which is bogus - 100MBit=12.5MB/s max) and back, varying all over. Copying to the single disk works is constant around 10MB/s. I use "sync" in exportfs for all shares. What could cause this behaviour? -- -----BEGIN GEEK CODE BLOCK----- Version: 3.12 GCS d--(+)@ s-:+ a- C+++(++++) UL+>++++ P+>++ L+++>++++ E-- W++ N o? K- w--(---) !O M+ V- PS++(+) PE(-) Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ b++(+++) DI+++ D G++ e* h>++ r%>* y? ------END GEEK CODE BLOCK------ http://www.stop1984.com http://www.againsttcpa.com