Date: Thu, 30 Mar 2000 16:55:35 +0200 From: "Niels Chr. Bank-Pedersen" <ncbp@bank-pedersen.dk> To: freebsd-questions@freebsd.org Cc: jesper@skriver.dk Subject: Can one do a striped volume with mirrored plexes Message-ID: <20000330165535.C48576@bank-pedersen.dk>
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Hi, I have 3 Kingston DS-500 chassis' connected to 3 Tekram controllers, and I want to create one volume/filesystem that must be resilient to disk failure, chassis failure and controller failure. In vinum(8) it says that I can create a mirrored volume with two striped plexes, but that would only give me resilience against disk failure, so what I was thinking of was something like this: Chassis disks controller A 0 1 3 4 6 7 9 a x I B 0 2 3 5 6 8 9 b x II C 1 2 4 5 7 8 a b x III - where each number, 0-b (x being spare disks), represents a small mirror of 2 disks, and then all mirrors should be striped together to form one volume. With the above setup I believe I will have resilience against all "single-unit failures" - be it disk, chassis or controller, but I dont see any way to configure this with vinum. I guess I can run vinum on top of vinum, but I don't know how well that would perform, so has anyone tried something similar, or has suggestions as to how to achieve both the resilience from mirroring and the performance from striping with a setup like this? /Niels Chr. -- Niels Christian Bank-Pedersen, NCB1-RIPE. Network Manager, Tele Danmark NET, IP-section. "Hey, are any of you guys out there actually *using* RFC 2549?" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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