From owner-freebsd-stable Thu May 4 12:23:17 2000 Delivered-To: freebsd-stable@freebsd.org Received: from privatecube.privatelabs.com (privatecube.privatelabs.com [198.143.31.30]) by hub.freebsd.org (Postfix) with ESMTP id EA62D37C28C for ; Thu, 4 May 2000 12:23:03 -0700 (PDT) (envelope-from mi@privatelabs.com) Received: from misha.privatelabs.com (root@misha.privatelabs.com [198.143.31.6]) by privatecube.privatelabs.com (8.9.2/8.9.2) with ESMTP id OAA07365; Thu, 4 May 2000 14:22:18 -0400 (EDT) Received: from privatelabs.com (mi@localhost [127.0.0.1]) by misha.privatelabs.com (8.9.3/8.9.3) with ESMTP id PAA07955; Thu, 4 May 2000 15:22:49 -0400 (EDT) (envelope-from mi@privatelabs.com) From: mi@privatelabs.com Message-Id: <200005041922.PAA07955@misha.privatelabs.com> Date: Thu, 4 May 2000 15:22:46 -0400 (EDT) Subject: Re: How good is AMI MegaRAID support? To: vallo@matti.ee Cc: freebsd-stable@FreeBSD.ORG In-Reply-To: <20000504210635.A8681@myhakas.matti.ee> MIME-Version: 1.0 Content-Type: TEXT/plain; CHARSET=US-ASCII Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 4 May, Vallo Kallaste wrote: = Are you sure? I think the upcoming IBM ServeRaid version 4 adapters = will have PowerPC 750 processor which outperforms current host = processors easily? Anyway I think for degraded mode you'll definitely = need separate processing unit to offload parity calculations from host = processor, else the system will calculate parity not service users. Generally, you want all of the available power to be used all the time. In this case, you'd want to have a lot of CPU. When the array works in a degraded mode, there is still enough for your users. When it functions properly, the extra processing power is not wasted. = That's theory, of course, but it seems so obvious. Am I missing = something? Well, the way you describe the ServerRaid4, it will add another processor to a machine, without the benefits of SMP -- no _symmetrical_ multi-processing... -mi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message