Date: Wed, 20 Sep 2000 13:33:03 -0700 From: Alfred Perlstein <bright@wintelcom.net> To: Fred Clift <fclift@verio.net> Cc: Edward Elhauge <ee@uncanny.net>, freebsd-isp@FreeBSD.ORG, grog@FreeBSD.ORG Subject: Re: Frustration with SCSI system Message-ID: <20000920133303.I9141@fw.wintelcom.net> In-Reply-To: <Pine.BSF.4.21.0009201428350.14181-100000@vespa.orem.iserver.com>; from fclift@verio.net on Wed, Sep 20, 2000 at 02:35:11PM -0600 References: <200009202024.NAA45822@ns2.uncanny.net> <Pine.BSF.4.21.0009201428350.14181-100000@vespa.orem.iserver.com>
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* Fred Clift <fclift@verio.net> [000920 13:22] wrote: > If you're willing to go through strange install contortions, you can boot > off of an MFS (Or MD, depending on what version you use ) root filesystem > (copies stored in separate partition, on both disks you are mirroring) and > then have everything else mirrored. Then at least your running system > doesn't rely on any unmirrored disks. You can put a minimal root > filesystem in memory and then have the rest of the stuff moved out via > either symlinks or via just moving things around. Ie if you want to set > up a bunch of boxes, it's nice to have most of the rc bootup stuff really > reside on the vinum'd user... > > At any rate, from what I understand, it's the boot loader that doesn't > understand vinum disks. put a kernel and minimum stuff somewhere the > bootloader can find it and then mirror the rest. If one of the disks goes > out, things keep working (root in memory, usr mirrored) and if you have to > reboot, just make sure the good disk is the preferred boot device in your > scsi bios. [cc'd to Greg Lehey who wrote vinum] Greg, I seem to remeber you being able to boot a vinum root mirror, is there docco anywhere on this? A cursory glance over http://www.vinumvm.org/ doesn't reveal how you were able to pull this off. Another alternative is that for the most part / doesn't need to be writeable with a few small exceptions that can be worked around, even though it requires manual gyrations, one could mount / read-only and make sure to have a spare disk that one syncs with whenever / needs to be changed, the point being if you have hotswap you can simply swap the disks and not loose any changes if you are diligent about syncronising the disks. -Alfred To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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