Date: Wed, 09 May 2007 11:22:11 -0500 From: Jonathan Dobbie <jonathan_dobbie@mcad.edu> To: freebsd-geom@freebsd.org Subject: Re: Nesting gvinum? Message-ID: <4641F533.4000101@mcad.edu> In-Reply-To: <20070509160018.GB22504@keira.kiwi-computer.com> References: <4641DE02.3000706@mcad.edu> <20070509160018.GB22504@keira.kiwi-computer.com>
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Rick C. Petty wrote: > On Wed, May 09, 2007 at 09:43:14AM -0500, Jonathan Dobbie wrote: > >> I was hoping to have something like md+LVM where I could change the size >> of RAID 5 volumes. Could I have a large gvinum raid-5 volume and then >> make 3 gvinum volumes on top that could be resized? >> > > Except for the nesting, this is precisely what gvinum does. Why do you > need nesting? Resizing volumes is something gvinum is supposed to be able > to do. > > I thought that it could only resize striped volumes? Would you happen to have a guide handy? If I, say, wanted to resize usr and log to add 20GB to log, could I drop the s0 subdisk from both, resize, readd, sync and then repeat for s1 and s2? >> Also, is there a better fs to use on top of gvinum? Unlinks and file >> creation "feel" slow to me. I thought about reiser, but my coworker was >> > > UFS2. It's incredibly fast, even with RAID5 underneath. > > I used newfs and sysinstall to create all of the partitions, so they should be UFS2, no? >> burned the last time he put it on a production box and we've been rather >> cautious since. >> > > I wasn't aware that FreeBSD supported reiser. > > I was a but surprised as well. *HISTORY* <http://www.freebsd.org/cgi/man.cgi?query=mount_reiserfs&apropos=0&sektion=0&manpath=FreeBSD+6.2-RELEASE&format=html#end>; The *mount*/_/*reiserfs* utility first appeared in FreeBSD 6.0. *AUTHORS* <http://www.freebsd.org/cgi/man.cgi?query=mount_reiserfs&apropos=0&sektion=0&manpath=FreeBSD+6.2-RELEASE&format=html#end>; The *mount*/_/*reiserfs* utility and manual were written by Jean-Sébastien Pédron <dumbbell@FreeBSD.org <mailto:dumbbell@FreeBSD.org>>. >> Didn't UFS2 come out for freeBSD a while ago? I'm >> > > as of 5.0, in the 2002-2003 timeframe. > > >> I know that shelling out the 250$ for a raid card is the best option, >> but no one with a budget wants to put any money into the box. >> > > Not really. Software RAID has been proven to be faster than hardware > numerous times. I read somewhere that this has to do with the transfer > blocksize or something. I haven't witnessed this myself, but I've seen > gstripe & gmirror outperform RAID0/1 cards. > > > I'm definitely sold on software RAID for 0 and 1, but it is nice to boot off of RAID 5 and forget that it is there until a drive dies.
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