From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Sat, 31 Dec 2011 00:31:11 -0500 To: 9fans@9fans.net Message-ID: In-Reply-To: <4EFE2F9F.9080405@0x6a.com> References: <322fa0e8c0ed03f250cdcecaeec7040b@ladd.quanstro.net> <79ebf95bd05ebf52fc95480beb655e42@ladd.quanstro.net> <4EFE2F9F.9080405@0x6a.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [9fans] (no subject) Topicbox-Message-UUID: 52d56cea-ead7-11e9-9d60-3106f5b1d025 > > if a coraid appliance were pcie-attached rather than ethernet attache= d, > > would you still ask this question? =C2=A0do you think the block diagr= am of coraid > > hardware looks fundamentally different than the block diagram of a ra= id > > card? >=20 > It's just curiosity. I know the appliance is Plan 9 based. If it > uses an off-the-shelf RAID chip I might buy a card with that chip > since it works in Plan 9. If it's fs(3) I know fs(3) is good enough > for my needs. If it's something else at least I know fs(3) is not > good enough and I might be tempted to write something myself. So yes, > I'd ask even if it was a PCIe card instead of network appliance. the motivation behind my question is that it's not clear to me that there= is such a thing as pure hardware raid. if someone knows of something that implements the entire read/write path without a cpu, even with a degraded or rebuilding raid, i'd be very interested in that. but as far as i know= , there's always a processor in there on the other side of the bus. in case of aoe= , the bus is ethernet and for a "hardware raid" card, it's usually some form of pci. (see wiki's raid article.) - erik