Date: Tue, 13 Nov 2012 20:30:12 -0600 (CST) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Julian Elischer <julian@freebsd.org> Cc: freebsd-fs@freebsd.org Subject: Re: RHEL to FreeBSD file server Message-ID: <alpine.GSO.2.01.1211132024540.19664@freddy.simplesystems.org> In-Reply-To: <50A2F804.3010009@freebsd.org> References: <50A130B7.4080604@cse.yorku.ca> <20121113043409.GA70601@neutralgood.org> <alpine.GSO.2.01.1211131132110.14586@freddy.simplesystems.org> <50A2B95D.4000400@cse.yorku.ca> <50A2F804.3010009@freebsd.org>
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On Tue, 13 Nov 2012, Julian Elischer wrote: > On 11/13/12 1:19 PM, Jason Keltz wrote: >> On 11/13/2012 12:41 PM, Bob Friesenhahn wrote: >>> On Mon, 12 Nov 2012, kpneal@pobox.com wrote: >> >> Initially, I had one storage chassis, split between 2 LSI 9205-8e >> controllers with a 22 disk pool comprised of 11 mirrored vdevs. >> I think that I'm still slightly uncomfortable with the fact that 2 disks, >> which were all purchased at the same time, could essentially die at the >> same time, killing my whole pool. Yet, while moving to raidz2 would allow >> better redundancy, I'm not sure if the raidz2 rebuild time and decrease in >> performance would be worth it.. The concern about a bad batch of disks is a valid concern. Of course a bad batch of disks could even bring down raidz2. If this is a concern, then purchase the disks from two different vendors. >> I'll buy another md1220, a few more disks, add another 9205-8e card... and >> use triple mirrored vdevs instead of dual.... I only really need about 8 x Triple mirror is considered to be exceedingly reliable. Not very cost effective though. Reads will be faster than with simple mirror since any one of the three disks can satisfy a read request. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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