> On Mon, Dec 22, 2003 at 04:10:27PM -0600, P. Larry Nelson wrote: >> I've been using LVM now since sometime this past summer and >> everything has worked great and as advertised, until I tried >> to unmount a logical volume. And this happens on both RedHat >> 9 and ES_3. >> >> I had occasion the other day to unmount one of the mounted raid >> arrays in order to upgrade some firmware. When I tried to do an >> unmount command, I got "device is busy". Ok, I'm cd'd there >> from one of my windows or something, so I make sure all open >> terminal windows are *not* cd'd there. Redo the umount command >> with same result. Weird, something's got a file open. So, I did >> an lsof command and grep for the device (/dev/VG1/LV1). Nothing. >> I try greping for the mount name (/scratch/cdf). Nothing. >> It will not let me unmount the logical volume. >> >> The system in question is running RedHat 9 w/kernel 2.4.20-24.9smp >> with RedHat's lvm-1.0.3-12. I just so happened to have built >> another system using RedHat's ES_3 w/kernel 2.4.21-4.0.1.ELsmp and >> their lvm-1.0.3-15, so I thought I'd try it there. Built an identical >> logical volume, mounted it, tested it (works fine), tried to umount >> the filesystem with identical results: device is busy. Checked >> again using lsof. Nothing open on the mounted filesystem. >> >> I went checking back thru about 4 months of this list and saw >> (apparently) that no one else has this problem. At this point >> I'm a bit baffled why the umount command isn't working. I've >> also seen nothing that might address this in the LVM-HOWTO. >> Then again, I could have missed it. >> >> Ideas? > maybe some kernel service is holding a reference > to that device, nfs or samba server comes to mind, > just try to disable them one after the other and > see if umount will work ... In my opinion this is a severe mis-feature (aka: bug) in the Linux kernels. In some occasions it is impossible to kill an application when unmounting a filesystem. This leads to problems with shutting down the system cleanly. For example a device might have been temporary offline when samba tried to access it. The samba thread locks indefinitely and it is impossible to kill it and thus also impossible to unmount the filesystem. Not sure if LVM guys can do anything about this though. =) Perhaps you can push kernel developers to make it easier to recover from these kinds of problems? > HTH, > Herbert _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
