From owner-freebsd-hackers Wed May 30 0:53: 7 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from sdmail0.sd.bmarts.com (sdmail0.sd.bmarts.com [209.247.77.155]) by hub.freebsd.org (Postfix) with ESMTP id C202F37B505 for ; Wed, 30 May 2001 00:52:57 -0700 (PDT) (envelope-from gordont@bluemtn.net) Received: from localhost (gordont@localhost) by sdmail0.sd.bmarts.com (8.11.3/8.11.2/BMA1.1) with ESMTP id f4U7o3a99666; Wed, 30 May 2001 00:50:03 -0700 (PDT) Date: Wed, 30 May 2001 00:50:03 -0700 (PDT) From: Gordon Tetlow X-X-Sender: To: Wilko Bulte Cc: "E.B. Dreger" , Subject: Re: brainstorm: "intermediate" disk caching In-Reply-To: <20010528203435.F619@freebie.demon.nl> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG I'm struck by the old axiom: You can have it fast. You can have it reliable. You can have it cheap. But you can only have 2 of the 3. If you figure out how to get all 3. Call me. -gordon On Mon, 28 May 2001, Wilko Bulte wrote: > On Mon, May 28, 2001 at 04:31:17PM +0000, E.B. Dreger wrote: > > Greetings all, > > > > I just had a brainstorm... > > > > I was thinking about database servers with several spindles in a RAID 5 > > array. Write performance is inherently disappointing -- which may or may > > not be an issue. > > > > Would it be worth the trouble to design an "intermediate" cache, whereby > > data are quickly written to a spool disk, then to the final destination? > > Most hardware RAID boxes do exactly that ;) For anything serious only > consider battery-backed up writeback cache, with mirrored caches, and > redundant RAID array controllers. > > Start saving your $$ now ;) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message