From owner-freebsd-isp Fri Jan 22 23:08:03 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA25275 for freebsd-isp-outgoing; Fri, 22 Jan 1999 23:08:03 -0800 (PST) (envelope-from owner-freebsd-isp@FreeBSD.ORG) Received: from rs4s1.datacenter.cha.cantv.net (rs4s1.datacenter.cha.cantv.net [200.44.32.54]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA25256; Fri, 22 Jan 1999 23:07:57 -0800 (PST) (envelope-from lem@cantv.net) Received: from 200.44.8.236 (tc2r9-236.ras.cha.cantv.net [200.44.8.236]) by rs4s1.datacenter.cha.cantv.net (8.9.1a/8.9.1/1.0) with SMTP id DAA15171; Sat, 23 Jan 1999 03:07:40 -0400 (VET) Date: Sat, 23 Jan 1999 03:07:40 -0400 (VET) Message-Id: <199901230707.DAA15171@rs4s1.datacenter.cha.cantv.net> From: "Luis E. Munoz" To: "Gary Palmer" DUB@payserv.telekurs.com Cc: radams@siscom.net, freebsd-isp@FreeBSD.ORG Subject: Re: Re: Building new mail system X-Mailer: Top Gun Postman version 1.2 beta for USR PalmPilot X-URL: http://www.isaac.cs.berkeley.edu/pilot/TGpostman/ Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org "Gary Palmer" wrote on 22/1/99 23:54: >Bernhard Duebi wrote in >message ID ><36A8638B.5D09A4A5@Tele >kurs.com>: >> Hi, >> >> I don't know the >controllers, but if ever >possible avoid Raid 5. It's >slow. I >> think Raid 0+1 is the way >to go. > >Thats a very biased >statement. RAID5 is fine >(should in theory be >identical) >as RAID0 for reads. Yes, >writes have a penalty, but I >think that very much >depends on the application. >Yes, performance degrades >if you lose a drive and >you go into rebuild mode >onto a spare, but hey, guess >what, mirrors do too :) In addition to this, many contemporary controllers have pretty decent caching in battery-backed memory. This helps a lot while a member is lost. Another plus on the 0+1, also called 10, is that it can tolerate *some* failure scenarios where more than a single member dies. My advice is to go witu 0+1 if you have the budget. -- -lem To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message