Hi, Adam Goryachev wrote on 15.06.2007 at 11:28:13 [Re: [BackupPC-users] How to move backuppc data from lvm to bigger disks/lvm?]: > Ralf Gross wrote: > > [...] > > dd if=/dev/mapper/VolGroup00-LogVol00 bs=8192 of=backuppc.dump > > [...] > > I think the dd data includes information about the lvm volume/logical > > groups. > [...] > The problem I see in your suggestion is that you are copying a 1TB > filesystem/partition into a 800GB one therefore if you have stored data > at the end of the drive, then it will be lost, the above should solve > that problem.
just to make it clearer: the device file name /dev/mapper/VolGroup00-LogVol00 means you have not been very imaginative when choosing VG and LV names, but aside from that, it represents a plain block device. The filesystem is not and should not be aware of how the underlying block device is implemented. Reading /dev/mapper/VolGroup00-LogVol00 gives you the concatenation of the raw blocks it consists of in ascending order, just like reading /dev/sda1, /dev/sda, /dev/fd0 or /dev/sr0 does (/dev/sr0 is likely not writable though) - nothing more and nothing less. Meta-information about VG and LVs is stored in the PVs outside the data allocated to any LV. I agree that you will need at least as much space as your LV takes up if you want to copy it. I would add that copying into a file will probably give you more trouble than copying to a block device (provided it is large enough). There's simply one layer less of arbitrary file size limits you would be dealing with. Regards, Holger ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ BackupPC-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
