From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roman Mamedov Subject: Re: Mixed controllers on JBOD Raid 6? Date: Thu, 2 Jul 2015 00:14:40 +0500 Message-ID: <20150702001440.2d391587@natsu> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/H8_VvVJ2Xs.Nx+Te=RRWlao"; protocol="application/pgp-signature" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Another Sillyname Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/H8_VvVJ2Xs.Nx+Te=RRWlao Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Wed, 1 Jul 2015 19:27:11 +0100 Another Sillyname wrote: > I'm looking at an Asus Maximus Vii Gene motherboard which has 8 SATA > controller connectors.....6 Intel and 2 other (can't remember at the > moment). >=20 > Are there any projected issues or concerns about making a 8 Drive > RAID6 array where I'm using mixed controllers? Mixing controllers in general -- no issue whatsoever, that's the beauty of = the (Linux) software RAID. In cases like yours, there could be a minor performance hit if the addition= al 2-port controller gets fed only a single-lane of PCI-E 1.0. If so, this will cap the total throughput of both ports combined to less than 250 MB/sec. However on the motherboard that you specified that controller is ASMedia ASM1061 which supports PCI-E 1x 2.0. And if the chipset really provides a 2= .0 port to it (not an expert in Intel chipsets, check the datasheets), then the cap would be 500 MB/sec, which should be more than enough for two regular spinning hard drives. In any case, typically with RAID6 setups like these getting the highest possible sequential read/write performance isn't on top of the priorities list, so the above may not even be a concern for you. --=20 With respect, Roman --Sig_/H8_VvVJ2Xs.Nx+Te=RRWlao Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlWUPCAACgkQTLKSvz+PZwgsuwCeKFVp8JB2xyc5hUDKfKCpB4fW KFYAn3AAZfU6s8tDF+VoopKvaoAG15bU =x1R+ -----END PGP SIGNATURE----- --Sig_/H8_VvVJ2Xs.Nx+Te=RRWlao--