From owner-freebsd-questions@FreeBSD.ORG Sun Aug 1 05:00:52 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 395971065760 for ; Sun, 1 Aug 2010 05:00:52 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [IPv6:2607:f678:1010::34]) by mx1.freebsd.org (Postfix) with ESMTP id 9F2BE8FC1B for ; Sun, 1 Aug 2010 05:00:51 +0000 (UTC) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id o7150ouA060382 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sat, 31 Jul 2010 22:00:50 -0700 (PDT) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id o7150o8K060381; Sat, 31 Jul 2010 22:00:50 -0700 (PDT) Received: from fbsd61 by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA13558; Sat, 31 Jul 10 21:58:10 PDT Date: Sat, 31 Jul 2010 21:58:02 -0700 From: perryh@pluto.rain.com To: amvandemore@gmail.com Message-Id: <4c54feda.qN353DwCHkYmLrO3%perryh@pluto.rain.com> References: <4c53ef2f.bblzdu2k2iMBdNzW%perryh@pluto.rain.com> In-Reply-To: User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: freebsd-questions@freebsd.org Subject: Re: Installing a system to use both gjournal and gmirror X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Aug 2010 05:00:52 -0000 Adam Vande More wrote: > > * Since I can't mirror or journal a FAT32 slice AFAIK, > > You can do both to it, it just won't be able to handle the journal. > Mirroring is just fine. GEOM stuff works at the block level making > it filesystem independant. Wouldn't journalling a FS that doesn't support it be wasted effort? I suppose mirroring would work as long as the partition were written only by FreeBSD. Anything written by DOS or Windows would not get mirrored, resulting in confusion as to which copy was correct, no? > > and there seems little point in mirroring swap or /tmp ... > > While you are correct there isn't much point in mirroring swap > and tmp, there also isn't much point in trying to save the space > either. It's not very much relatively and if you use it for > something else you impact the performance of your disks. Granted there may not be a lot of space involved, but I don't follow you WRT performance impact. If anything I'd think that independent equal-sized swap partitions on separate channels should perform better than if they were mirrored, since any given write would be performed on only one of them vs on both. > http://www.freebsd.org/doc/en_US.ISO8859-1/articles/gjournal-desktop/ That's the how-to whose 8.1-RELEASE version I had already looked at. I didn't see any mention of performance, nor of mirroring, nor of how to intervene after sysinstall has sliced and partitioned the disks and before it starts installing the distributions -- the last being necessary if the data and journal are to share a partition. Did I miss something?