From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roman Mamedov Subject: Re: standard performance (write speed 20Mb/s) Date: Wed, 27 Jul 2011 11:46:47 +0600 Message-ID: <20110727114647.5a80b3d0@natsu> References: <201107162140.58883.raid1@fuckaround.org> <4E226464.2030200@hardwarefreak.com> <4E22D167.2010905@anonymous.org.uk> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/GsSkgNm=PFdaiJ9pHR5TfT1"; protocol="application/pgp-signature" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Simon Matthews Cc: John Robinson , Pol Hallen , linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/GsSkgNm=PFdaiJ9pHR5TfT1 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Tue, 26 Jul 2011 22:42:14 -0700 Simon Matthews wrote: > On Sun, Jul 17, 2011 at 5:11 AM, John Robinson > wrote: >=20 > > Pretty poor. CentOS 5, Intel ICH10, md RAID 6 over 5 7200rpm 1TB drives, > > then LVM, then ext3: > > # dd if=3D/dev/zero of=3Dtest bs=3D4096 count=3D262144 > > 262144+0 records in > > 262144+0 records out > > 1073741824 bytes (1.1 GB) copied, 2.5253 seconds, 425 MB/s >=20 > What hard drive offers a sustained data rate of 425 MB/s or even half tha= t? "md RAID 6 over 5 7200rpm 1TB drives" does? :) At least half that - easily. But still, the result posted is very much inflated, they forgot the "conv= =3Dfdatasync" option, so mostly benchmarking the FS cache in RAM. --=20 With respect, Roman --Sig_/GsSkgNm=PFdaiJ9pHR5TfT1 Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEARECAAYFAk4vpkgACgkQTLKSvz+PZwi1FQCeN9AS+7PL9avyzamNUr/thBbR zAoAnA7wpoVdpSjYKsMF+5Q/P08vkf3X =bLWL -----END PGP SIGNATURE----- --Sig_/GsSkgNm=PFdaiJ9pHR5TfT1--