From owner-freebsd-isp Sun Apr 29 15:24: 9 2001 Delivered-To: freebsd-isp@freebsd.org Received: from inet03.citec.qld.gov.au (inet03.citec.qld.gov.au [203.5.10.10]) by hub.freebsd.org (Postfix) with ESMTP id B908437B424 for ; Sun, 29 Apr 2001 15:24:05 -0700 (PDT) (envelope-from sgcccdc@citec.qld.gov.au) Received: by inet03.citec.qld.gov.au; id IAA29443; Mon, 30 Apr 2001 08:23:56 +1000 (EST) Received: from guru.citec.qld.gov.au( 147.132.22.88) by inet03.citec.qld.gov.au via smap (V2.0) id xma029084; Mon, 30 Apr 01 08:23:41 +1000 Received: from localhost (sgcccdc@localhost) by guru.citec.qld.gov.au (8.9.3/8.9.3) with ESMTP id IAA19798; Mon, 30 Apr 2001 08:23:40 +1000 (EST) (envelope-from sgcccdc@citec.qld.gov.au) X-Authentication-Warning: guru.citec.qld.gov.au: sgcccdc owned process doing -bs Date: Mon, 30 Apr 2001 08:23:39 +1000 (EST) From: Colin Campbell To: Rowan Crowe Cc: Subject: Re: "failsafe" NFS In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hi, On Sun, 29 Apr 2001, Rowan Crowe wrote: > Hi all, > > I've just started reading up on, and playing with NFS. > > Is it possible to use multiple servers, like HD mirroring? For example a > passive second server quietly writes all changes to its local HD, but > ignores read requests - unless the first server is unresponsive. I don't believe so. AFAIK later versions of NFS allow you to specify multiple servers but the MUST be readonly. Syncing the servers is another problem. NFS won't do it for you. AT the risk of upsetting a few people, Linux has a couple of add-ons that p[rovide a "network block device". One pkg allows you to mirror a local disk with a remote disk, presenting the mirror as a device node (/dev/...). Another package provides a local device node that is actually a remote disk or partition or file (very flexible). Performance is supposed to be good on both of these. Much information is available on www.linux-ha.org. If only someone would do the same for *-bsd. Colin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message