Hello Bryn, I haven't had the time yet to try Stuart's suggestion... I've re did my attempt to create the lv though, and this time with the -vvv option in the step where I create the lv. my steps: dd if=/dev/sdb1 of=./disk0 # copy a existing LVM-partition to a file losetup -f ./disk0 # link the file to a loop device pvcreate /dev/loop0 # create a pv using the file vgcreate SmallDiskGroup /dev/loop0 # create a new volumegroup using the loop0 device as phisical volume. vgchange -a y SmallDiskGroup #Activate the volumegroup nb. vgdisplay SmallDiskGroup gives 'Act PV 1' but 'MAX LV 0' the output of lvcreate -vvv -L1 -nSmallDiskVolume SmallDiskGroup is downloadable here: http://pastebin.com/pastebin.php?dl=m2b9dcd7f I hope you can find anything. Greetings, Geert On Mon, 2008-09-29 at 10:08 +0100, Bryn M. Reeves wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > geert Geurts wrote: > > So what I did first create a LVM partition of 1MB on a memorystick and then > > change the if of dd to point to the LVM partition, I'm now able to pvcreate > > /dev/loop0, vgcreate SmallDisk /dev/loop0. > > But I'm unable to create a logical volume in the SmallDisk group... > > what am I doing wrong here? is it even possible if not why? > > Hi Geert, > > What was the error you were getting at this point? If possible, can you > use a service like pastebin.com to post the complete output of "lvcreate > - -vvv" with the options you're using for the SmallDisk VG. That should > give enough detail to have some idea where it's failing. > > I think the idea is reasonable enough although you'll probably need to > do some fiddling around to get the size/number of the gmailfs volumes > right to give good performance. > > Snapshots could definitely work here but I think it might be a bit > tricky without some of the patches that are currently outstanding for > device-mapper, esp. Mikulas' snapshot merging patches which you'd need > to "restore" one of the COW areas. See the thread here: > > http://kerneltrap.org/Linux/LVM_Snapshot_Merging > > Regards, > Bryn. > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org > > iEYEARECAAYFAkjgmxgACgkQ6YSQoMYUY96LegCcCHPZNLfhTUjIrsLiJcgROTDV > +SwAoLFQDiGpkZl5tpEFW5hjFH+6OuAj > =i+W8 > -----END PGP SIGNATURE----- > > _______________________________________________ > 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/ _______________________________________________ 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/
