From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mondschein.lichtvoll.de ([194.150.191.11]:55540 "EHLO mail.lichtvoll.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753394Ab2GTM6N convert rfc822-to-8bit (ORCPT ); Fri, 20 Jul 2012 08:58:13 -0400 From: Martin Steigerwald To: linux-btrfs@vger.kernel.org Subject: Re: Very slow samba file transfer speed... any ideas ? Date: Fri, 20 Jul 2012 14:58:11 +0200 Cc: Remco Hosman References: <201207201115.42483.Martin@lichtvoll.de> <500923E5.6040609@hosman.xs4all.nl> (sfid-20120720_113234_810772_6AF30F06) In-Reply-To: <500923E5.6040609@hosman.xs4all.nl> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Message-Id: <201207201458.12018.Martin@lichtvoll.de> Sender: linux-btrfs-owner@vger.kernel.org List-ID: Am Freitag, 20. Juli 2012 schrieb Remco Hosman: > > 11 really fast 15000rpm FC / SAS disks could possibly do 936 MB/s. > > But regular 7200rpm SATA disks depending to the on disk location > > might be as slow as 40-50 MB/s – just try fio disk-zone-profile on > > one if you do not believe this – and then even with 11 disks 936 > > MB/s is out of reach. > > My BTRFS array consists of 5 WD Green 2T disks. each of them goes a > bit over 100MB/sec on sequential read/write. I tested 2 WD Green 1,5 TB and each of them goes about 90-100 MB/s at the beginning of the disk and about 40-50 MB/s at the end of the disk. So did you run fio disk-zone-profile on the whole disk and made a graph? If not, I do not believe your figures. Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7