Holger Parplies schrieb: > 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
That's true, but with only one volg/lv I didn't care much about 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. Ok, then dd if=/dev/VolGroup00/LogVol00 bs=8192 | gzip -2 -c > backuppc.dump.gz gzip -dc backuppc.dump.gz | dd of=/dev/fancy-vg-name/fancy-lv-name should work. I created a file with 'dd if=/dev/zero of=/var/lib/backuppc/null' this should help compressing the unused space better. > 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. Yeah, last time I did this on an other system I was able to use resize_reiserfs and it worked very well. I've no idea why resize_reiserfs is now giving me this bitmap error. Ralf ------------------------------------------------------------------------- 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 BackupPC-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
