Date: Sat, 30 May 2009 20:18:40 +0100 From: xorquewasp@googlemail.com To: Mike Meyer <mwm@mired.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Request for opinions - gvinum or ccd? Message-ID: <20090530191840.GA68514@logik.internal.network> In-Reply-To: <20090530144354.2255f722@bhuda.mired.org> References: <20090530175239.GA25604@logik.internal.network> <20090530144354.2255f722@bhuda.mired.org>
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On 2009-05-30 14:43:54, Mike Meyer wrote: > On Sat, 30 May 2009 18:52:39 +0100 > xorquewasp@googlemail.com wrote: > > Simple question then as the handbook describes both ccd and gvinum - > > which should I pick? > > My first reaction was "neither", then I realized - you didn't say what > version of FreeBSD you're running. But if you're running a supported > version of FreeBSD, that doesn't change my answer. Sorry, yeah. FreeBSD 7.2-RELEASE on AMD64. > If you're running 5.3 or later, you probably want gstripe. If you're > running something older than that, then gvinum won't be available > either, so you'll need to use ccd. I always figured gvinum was a > transition tool to help move from vinum to geom, which is why it's > managed to get to the 7.0 release with some pretty painful bugs in it, > which don't show up in gstripe. That sounds like the kind of entertainment I don't particularly want! > The handbook clearly needs to be rewritten - ccd isn't supported > anymore, except via the geom ccd class. However, I think zfs is going > to change it all again, so such a rewrite wont' be useful for very > long. I don't think zfs supports a two-disk stripe, thought it does do > JBOD. > > If you're running a 7.X 64-bit system with a couple of GIG of ram, > expect it to be in service for years without having to reformat the > disks, and can afford another drive, I'd recommend going to raidz on a > three-drive system. That will give you close to the size/performance > of your RAID0 system, but let you lose a disk without losing data. The > best you can do with zfs on two disks is a mirror, which means write > throughput will suffer. Certainly a lot to think about. The system has 12gb currently, with room to upgrade. I currently have two 500gb drives and one 1tb drive. I wanted the setup to be essentially two drives striped, backed up onto one larger one nightly. I wanted the large backup drive to be as "isolated" as possible, eg, in the event of some catastrophic hardware failure, I can remove it and place it in another machine without a lot of stressful configuration to recover the data (not possible with a RAID configuration involving all three drives, as far as I'm aware). xw
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