Date: Thu, 21 Apr 2005 19:07:34 -0400 From: Paul Mather <paul@gromit.dlib.vt.edu> To: Claus Guttesen <kometen@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: vinum or gvinum on FreeBSD 5.4 Message-ID: <1114124854.43365.137.camel@zappa.Chelsea-Ct.Org> In-Reply-To: <1114123141.43365.122.camel@zappa.Chelsea-Ct.Org> References: <b41c755205042101398046ab4@mail.gmail.com> <1114123141.43365.122.camel@zappa.Chelsea-Ct.Org>
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> On Thu, 2005-04-21 at 10:39 +0200, Claus Guttesen wrote: > > Hi. > > > > I may implement (g)vinum to stripe two 2 TB raid 5 volumes into a > > single 4 TB vinum-volume. The volumes reside on a atabeast doing the > > raid 5. The server is a 5.4 RC2 doing nfs on i386. > > > > According to some threads gvinum may not be completely stable (in 5.3, > > http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2004-11/0537.html) > > when doing raid 5 but works fine when striping. > > > > Should I go vinum or gvinum? Will newfs have problems with a 4 TB > > volume? Are there any performance-degradation doing striping? I forgot to mention, but you should consult http://www.freebsd.org/projects/bigdisk/ to get an idea of the current state of play and issues regarding large disk handling in FreeBSD. According to the table of userland tools, it should be okay to newfs a file system > 2 TB, but you might not be able to fsck or dump/restore it. :-( Also, I think that page holds for -CURRENT, and may not apply to 5.x. But, Pawel Jakub Dawidek has worked on large disk support, and so there's a good chance that his geom_stripe feature is able to handle > 2 TB sizes. You could test it via gstripe on large swap-backed md providers. I also dimly recall you may run into problems running out of RAM trying to fsck very large filesystems. Cheers, Paul. -- e-mail: paul@gromit.dlib.vt.edu "Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid." --- Frank Vincent Zappa
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