Date: Thu, 24 Aug 2006 06:53:39 -0500 From: Eric Anderson <anderson@centtech.com> To: Ulf Lilleengen <lulf@stud.ntnu.no> Cc: freebsd-geom@freebsd.org Subject: Re: gvinum drivegroups and concat command Message-ID: <44ED9343.20402@centtech.com> In-Reply-To: <20060814073128.GA27499@stud.ntnu.no> References: <20060814073128.GA27499@stud.ntnu.no>
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On 08/14/06 02:31, Ulf Lilleengen wrote: > Hi, > > I'm doing work on gvinum these days, and I've implemented a possibility of > drivegroups. It is possible to add drives to group at creation, but it will also > be possible to add drives to groups afterwards. The advantage with drivegroups > are not very big right now, but I've started to work on the first command that > will take utilization of drivegroups. > > The concat command creates a concatenated volume, and from old vinum, it uses > drives as parameter. With drivegroups one can now still specify drives, or > groups or you don't even have to specify anything but the size, as gvinum then > will use the default drivegroup and create a volume for you there. > > This is how i think the concat command should be like: > - if name not specified, use drivegroup-volnum (maybe somethingelse) > - size must be specified, or maybe a "fill drives/group" argument? > - if group specified, it tries to create subdisks on all drives in the > drivegroup. > - if drivegroup not specified, and neither drives; use > defaultdrivegroup. > - if drives specified, use them. overrides drivegroups. > > The general usage will be: > concat [-f] [-n name] [-v] [-g group] [drives] > > Further advantages with drivegroups can be the mirror and stripe commands, as > well as the possibility to move drivegroups between different machines and group > your drives into logical collections. There will be more on this later. > > If anyone have any suggestions, I would like to hear it, as I'm starting on > implementing these commands now and think it's very important that it's being > done right. If I have overlooked anything, feel free to comment. Other > improvements in gvinum is mentioned in the lastest status report. > Will you also be able to remove/move drives from drivegroups? This sounds like a neat feature. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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