begin quoting Gus Wirth as of Mon, Dec 10, 2007 at 02:09:49PM -0800: > SJS wrote: > > begin quoting Tracy R Reed as of Mon, Dec 10, 2007 at 11:56:48AM -0800: > >> Todd Walton wrote: > >>> I partitioned my hard drive at something less than optimal. Now I'd > >>> like to put /usr on a different partition. How do I do this? > >> Most modern distros use LVM don't they? If you aren't on LVM yet be sure > >> to use it in the future. It makes this sort of problem go away. > > > > Hm... > > > > Let's say I have 3 disks and 1 CDROM drive and two IDE channels. > > > > I want to upgrade one of the disks. > > > > So... without LVM, it's simple. I pull the CDROM, drop in the disk, > > partition, format, mount, and play with tar or rsync, modify fstab, > > pull the old disk, move the new disk, reconnect the CDROM, and bob's > > your uncle. > > > > With LVM, is it even simpler? > > Yes. But you have to have empty space beforehand to allocate. Or you > have to do some gyrations to shrink a filesystem that has excess space > in order to reallocate it to the filesystem that needs it. Answers at > <http://www.tldp.org/HOWTO/LVM-HOWTO/index.html>
Specifically, http://www.tldp.org/HOWTO/LVM-HOWTO/removeadisk.html ...although it seems to require my changing where the CD-ROM drive connects into the IDE chain(s). I would not consider this a _good_ solution to the single most common disk-space problem I've ever had. It's rare that I can just _add_ disk; most often, I need to replace a disk with a bigger one, on a system that has no room for new devices or spare disk. So I think it's "no, it's not simpler", rather than "yes, it is simpler". Hm. Given TWO disks, it might be simpler. Connect spare disk #1, pvmove everything off the disk-to-be-replaced, vgreduce out the disk-to-be-replaced, pull disk-to-be-replaced, connect spare disk #2, pvmove everything off of spare disk #1 on to spare disk #2, vgreduce out spare disk #1, and you're done with nary a tar nor rsync in sight. Although tar or rsync might be faster than all that pvmoving. (And if you're backing up everything anyway... would restoring be faster?) > > Where are my bits, exactly? > > That is a much better question. They answer is, no one knows, exactly. > Well, at some level the operating system figures it out, but the answer > is convoluted involving potentially many redirects. Well, now, that doesn't give me a warm fuzzy. -- Cold and fuzzy. Stewart Stremler -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
