On Tue, 2009-06-09 at 09:04 +0200, Stefan Radovanovici wrote: > > On 6/9/2009 8:54 AM, Luca Berra wrote: > >> However, I can't remove /dev/sda4 (the partition on the failing disk) > >> from the group: > >> root@neriak:~# pvremove /dev/sda4 > >> Can't open /dev/sda4 exclusively - not removing. Mounted filesystem? > > what is the use of doing pvremove on sda4?? you just rip the disk off > > and dump it in the wastebin. > > Well, yeah, I just wanted to make sure that removing the disk while > some of its partitions are part of the LVM won't cause any problems. I > can't remove it just yet anyway, the OS is also installed on other > partitions on sda. So basically as long as I did a vgreduce, I can > take the disk out, is that right? I am assuming /dev/sda4 is still > showing in the pvdisplay output because it's still a LVM-type > partition. It is still labeled. LVM2 PV metadata has two components; a label in the 2nd sector that identifies the device as an LVM2 PV and includes the UUID and a metadata buffer further into the device that stores details like the VG the PV belongs to and the LVs that are allocated. Running vgreduce for a PV edits the metadata on all PVs in the appropriate VG to remove references to the PV being removed. The pvremove command just wipes the label from the PV. > > check /sys/block/sda/sda4/holders > > I did: > > root@neriak:/sys/block/sda/sda4/holders# l > total 0 > drwxr-xr-x 2 root root 0 2009-06-09 08:55 . > drwxr-xr-x 4 root root 0 2009-06-09 08:43 .. > lrwxrwxrwx 1 root root 0 2009-06-09 08:55 dm-1 -> ../../../../../../../../../virtual/block/dm-1 > root@neriak:/sys/block/sda/sda4/holders# cd dm-1 > root@neriak:/sys/block/sda/sda4/holders/dm-1# l > total 0 > lrwxrwxrwx 1 root root 0 2009-06-09 08:55 bdi -> ../../bdi/252:1 > I have to admit I don't know what I am looking at. What's the dm-1 ? Use dmsetup: $ dmsetup info --maj 252 --min 1 (the output above shows dm is using 252 as its major number for this device on your system). At a guess it looks like you somehow removed the PV from the VG while a logical volume was mapped on it. Regards, Bryn. _______________________________________________ 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/
