Date: Thu, 30 Sep 1999 15:07:07 +0930 From: Greg Lehey <grog@lemis.com> To: Trent Nelson <tpnelson@echidna.stu.cowan.edu.au> Cc: FreeBSD Questions <questions@FreeBSD.org> Subject: Re: Vinum/SoftUpdates query. Message-ID: <19990930150707.J496@freebie.lemis.com> In-Reply-To: <37F2F035.1EFCC779@echidna.stu.cowan.edu.au>; from Trent Nelson on Thu, Sep 30, 1999 at 01:08:05PM %2B0800 References: <37F2F035.1EFCC779@echidna.stu.cowan.edu.au>
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[following up to -questions] On Thursday, 30 September 1999 at 13:08:05 +0800, Trent Nelson wrote: > Hi, > > I was planning on sending this to FreeBSD-newbies@, but due to the > nature of the question, decided against it and sent it here. You would have done better to send it to -questions. I'm following up there. > I currently have a 3.2GB Quantum HDD as my primary master, and > an 8.4GB Quantum HDD as my primary slave. What I want to do is > create an exact image of the 3.2GB drive as a partition on the 8.4GB > drive, and basically set up vinum using this array of two 3.2GB > drives/partitions. You should put it on the secondary controller. The performance will be much better. > 1.) Is this possible? Yes. > The 8.4GB HDD is about two years newer than the 3.2GB HDD which > leads me to the understanding that there'd be obvious access time > discrepancies. That's not so serious. Vinum doesn't make any assumptions about relative speed. Obviously overall performance will be less than that of two faster disks. > The main thing I'm interested in is the fact I won't have two 3.2GB > HDDs, I'll have one 3.2GB HDD, and another drive with a 3.2GB > partition on it. Well, you'll have as many Vinum volumes as you want. You can divide up the space just about any way you want. > 2.) If it is possible, would the performance gain be worth the effort > to get it working? Note, I'm more interested in the experience I'd get > out of it rather than huge performance gains. That depends on how much effort it takes you :-) > 3.) Is it possible to get SoftUpdates working with vinum? Yes. > Has anyone tried this? Yes. We're currently seeing some problems with soft updates in connection with RAID-5, but that's not of any great relevance to your system, since you need at least 3 disks for RAID-5. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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