On Tue, Sep 26, 2006 at 10:32:51PM -0700, David Brown wrote: > bowen zheng wrote: > > > Help, lvm2 snapshot and XFS , using xfs_freeze to do this, but then > > lvcreate hang. > > The lvcreate does the xfs_freeze for you, so if you run xfs_freeze, then > the lcreate will hang. Running it with '-u' should allow the lvcreate to > hang. Are you saying that the lvcreate command literally executes xfs_freeze when used on a volume that happens to contain an XFS filesystem? Or that creating a snapshot is equivalent to using xfs_freeze? I too had read that it was suggested to call xfs_freeze before creating a snapshot. This worked on a Debian system a year or two ago. And then it stopped. I'm not sure if it was a kernel, lvm2 or xfs utilities update that caused it to stop working. I did file a debian bug a while back but nothing ever came of it: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=285979 > > I use lvm2 and xfs both. If I do not use xfs_freeze before, I can use > > lvcreate snapshot the lv. And it work fine for some static files or > > lv, but not for running system such as / (root) which will generate a > > log of I/O error. > > What kind of errors are you getting. I've done this on active filesystems > for backup purposes, and not had any problems. Running xfsdump on the snapshot I see many warnings like: debug: starting dump at Wed Sep 27 06:00:02 EDT 2006 ... /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692873 /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692876 /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692873 /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692876 /sbin/xfsdump: WARNING: could not stat dirent vg0_04875.vg ino 3692872: No such file or directory /sbin/xfsdump: WARNING: could not stat dirent vg0_04876.vg ino 3692875: No such file or directory /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692873 /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692876 /sbin/xfsdump: WARNING: could not stat dirent vg0_04875.vg ino 3692872: No such file or directory: using null generation count in directory entry /sbin/xfsdump: WARNING: could not stat dirent vg0_04876.vg ino 3692875: No such file or directory: using null generation count in directory entry /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692873 /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692876 /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692873 /sbin/xfsdump: WARNING: failed to get bulkstat information for inode 3692876 debug: dump complete at Wed Sep 27 06:00:04 EDT 2006 ... -- Steve Feehan _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
