From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Martin Subject: Re: Benchmarks: Linux Kernel RAID vs a Hardware RAID setup Date: Thu, 17 Jul 2008 18:26:03 +1000 Message-ID: <1216283163.10437.60.camel@sam.localdomain> References: <1216130769.5633.318.camel@sam.localdomain> <487E43D8.60106@hp.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-bwOMvcu+NODz3UywnzHh" Return-path: In-Reply-To: <487E43D8.60106@hp.com> Sender: linux-raid-owner@vger.kernel.org To: "Alan D. Brunelle" Cc: linux-raid@vger.kernel.org, Ben Martin List-Id: linux-raid.ids --=-bwOMvcu+NODz3UywnzHh Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2008-07-16 at 14:54 -0400, Alan D. Brunelle wrote: > Ben Martin wrote: > > Hi, > > Apologies if posting this here is inappropriate but a recent article > > of mine compares the Linux Kernel RAID code to an $800 hardware RAID > > card and might be of interest to list members: > >=20 > > http://www.linux.com/feature/140734 > >=20 >=20 > Hi Ben - >=20 > Did you do any performance testing of running /multiple/ disks through > the Adaptec card w/out HW RAID enabled - for example, comparing the 4 > ports on the mobo against 4 drives exported through the Adaptec card? Good question, however I must admit that I didn't test this. Being an 8 lane PCIe card it I thought that there would not be a huge issue with the interface to the card and drives being a bottleneck. http://www.adaptec.com/en-US/products/Controllers/Hardware/sas/value/SAS-31= 205/ Though it would be interesting to compare, once I move a few old drives off the mobo SATA controller and get 4 ports free. >=20 > I wonder if there are any potential bottleneck issues with the single > adapter card handling 6 independent drives (when testing SW RAID) versus > one exported "drive" (when testing HW RAID). >=20 > Regards, > Alan --=-bwOMvcu+NODz3UywnzHh Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAkh/AhsACgkQsIKOrI+5WvM+TQCgjRwQHxx1qH6KELPi6MXbgv6B xioAoOlPHZ3ejeqA51AltVxZDDaLpiMJ =yY4u -----END PGP SIGNATURE----- --=-bwOMvcu+NODz3UywnzHh--