From owner-freebsd-isp Thu Dec 17 19:44:24 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id TAA07335 for freebsd-isp-outgoing; Thu, 17 Dec 1998 19:44:24 -0800 (PST) (envelope-from owner-freebsd-isp@FreeBSD.ORG) Received: from mail.kersur.net (mail.kersur.net [199.79.199.3]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id TAA07329 for ; Thu, 17 Dec 1998 19:44:22 -0800 (PST) (envelope-from dswartz@druber.com) Received: from manticore (manticore.druber.com [207.180.95.108]) by mail.kersur.net (8.9.1/8.9.1) with SMTP id WAA21869; Thu, 17 Dec 1998 22:15:37 -0500 (EST) Message-Id: <3.0.5.32.19981217221528.009cb980@mail.kersur.net> X-Sender: druber@mail.kersur.net X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.5 (32) Date: Thu, 17 Dec 1998 22:15:28 -0500 To: Greg Lehey From: Dan Swartzendruber Subject: Re: RAID solutions? Cc: Matthew Patton , freebsd-isp@FreeBSD.ORG In-Reply-To: <19981218134159.S486@freebie.lemis.com> References: <3.0.5.32.19981217220842.009d5cf0@mail.kersur.net> <3.0.5.32.19981217220152.009c6100@mail.kersur.net> <3.0.5.32.19981215231329.00966ae0@mail.kersur.net> <19981218131434.M486@freebie.lemis.com> <3.0.5.32.19981217220152.009c6100@mail.kersur.net> <19981218133502.Q486@freebie.lemis.com> <3.0.5.32.19981217220842.009d5cf0@mail.kersur.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org At 01:41 PM 12/18/98 +1030, Greg Lehey wrote: >On Thursday, 17 December 1998 at 22:08:42 -0500, Dan Swartzendruber wrote: >> At 01:35 PM 12/18/98 +1030, Greg Lehey wrote: >>> On Thursday, 17 December 1998 at 22:01:52 -0500, Dan Swartzendruber wrote: >>>> >>>> Greg, are there any performance ramifications with RAID5? When not in >>>> degraded mode, of course... >>> >>> Yes, big ones. Every write in normal mode requires at least one >>> additional I/O to the parity block. >> >> That's what I wondered about. Probably not worth it for a news spool... > >It depends. Matthew was recommending RAID-1 (mirroring). That >requires significantly more disk. If you are concerned about the >integrity of your news spool, you have the choice between RAID-5 and >RAID-1. Mirroring sucks for this, no? Twice the space, and you still have to do an extra write, don't you? I know it can be faster when reading (I work at a company that does fault-tolerant TP systems, so we have to deal with these issues...) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message