From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Leblanc Subject: Re: EIO AP-1680 ATA133 RAID PCI Controller Date: 11 Feb 2003 13:16:31 -0800 Sender: linux-raid-owner@vger.kernel.org Message-ID: <1044998190.12695.3.camel@gregdell> References: <3E4329CE.5020706@netscape.net> <3E47E248.3080006@mvista.com> <3E48871A.3010709@netscape.net> <3E493005.4030702@mvista.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-E3n9VkeUvCPHtVtit7tK" Return-path: In-Reply-To: <3E493005.4030702@mvista.com> To: linux-raid@vger.kernel.org List-Id: linux-raid.ids --=-E3n9VkeUvCPHtVtit7tK Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Tue, 2003-02-11 at 09:16, Steven Dake wrote: > I don't know the specifics of those cards, but if they include an i/o=20 > processor, they are a hardware RAID. >=20 > Keep in mind that unless you want to boot or use a RAID 5, or want to=20 > share your RAID volumes between different operating systems, there is=20 > little reason to purchase a hardware RAID card. Software RAID is quite=20 > sufficient for most needs and the host processor running at 2+ ghz is=20 > much better at RAID then a 60 mhz i960 IOP. Keep in mind, though, that=20 > hardware RAID adaptors have built in xor accelerators which can do=20 > multiple xors in one instruction in hardware, allowing for much better=20 > xor performance then the intel or ppc processor can do. While the performance of RAID 5 using software RAID is generally far superior to that provided by hardware RAID, host CPU usage can be -quite- high in high-load situations. The benchmarks recently posted had cpu usage numbers at over 90% on most sequeential writes and reads. Greg --=-E3n9VkeUvCPHtVtit7tK Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQA+SWgunAkVXO6fw4sRAoQzAJ9/LZ4qWKSF2BWXfe+MyyRP5gY0JgCfQYov TXf6Yq7XQxmcc/kFWy1PQKY= =Hoij -----END PGP SIGNATURE----- --=-E3n9VkeUvCPHtVtit7tK--