Hello All,

I 've gotten myself into trouble by running out of disk space. On an all-in-one Ovirt system some users have filled up a Windows7 virtual machine and in doing so filled up an nfs mount and in doing so filled up a root partition:

B estandssysteem Grootte Gebruikt Besch Geb% Aangekoppeld op /dev/mapper/centos-root 50G 46G 4,8G 91% / devtmpfs 7,9G 0 7,9G 0% /dev tmpfs 7,9G 0 7,9G 0% /dev/shm tmpfs 7,9G 8,5M 7,9G 1% /run tmpfs 7,9G 0 7,9G 0% /sys/fs/cgroup /dev/md127 498M 106M 393M 22% /boot /dev/mapper/centos-home 20G 33M 20G 1% /home /dev/mapper/centos-var 360G 623M 360G 1% /var hotelcaw:/mnt/iso 50G 46G 4,8G 91% /rhev/data-center/mnt/hotelcaw:_mnt_iso tmpfs 1,6G 0 1,6G 0% /run/user/0

I tried to remedy that today by using ssm to add storage. I added an extra disk witch shows up as sdc:

[ root@hotelcaw ~]# ssm list ---------------------------------------------------------------- Device Free Used Total Pool Mount point ---------------------------------------------------------------- /dev/md126 208.00 MB 437.84 GB 438.05 GB centos /dev/sda 465.76 GB PARTITIONED /dev/sda1 0.00 KB 500.94 MB 501.00 MB md /dev/sda2 0.00 KB 438.05 GB 438.18 GB md /dev/sdb 465.76 GB /dev/sdb1 0.00 KB 500.94 MB 501.00 MB md /dev/sdb2 0.00 KB 438.05 GB 438.18 GB md /dev/sdc 465.76 GB ---------------------------------------------------------------- ------------------------------------------------------ Pool Type Devices Free Used Total ------------------------------------------------------ centos lvm 1 208.00 MB 437.84 GB 438.05 GB ------------------------------------------------------ ------------------------------------------------------------------------------------- Volume Pool Volume size FS FS size Free Type Mount point ------------------------------------------------------------------------------------- /dev/centos/swap centos 7.88 GB linear /dev/centos/root centos 50.00 GB xfs 49.98 GB 4.83 GB linear / /dev/centos/home centos 20.01 GB xfs 20.00 GB 20.00 GB linear /home /dev/centos/var centos 359.96 GB xfs 359.79 GB 359.23 GB linear /var /dev/md126 md 438.05 GB raid1 /dev/md127 md 500.94 MB xfs 497.61 MB 417.29 MB raid1 /boot /dev/sda1 md 501.00 MB xfs 497.61 MB 417.29 MB part /dev/sdb1 md 501.00 MB xfs 497.61 MB 417.29 MB -------------------------------------------------------------------------------------

now adding /dev/sdc to pool centos fails with:

[root@hotelcaw ~]# ssm add -p centos /dev/sdc Device /dev/sdc not found (or ignored by filtering). Unable to add physical volume '/dev/sdc' to volume group 'centos'. SSM Error (2012): ERROR running command: "lvm vgextend centos /dev/sdc"

I did a format 0 on the hard drive that makes up /dev/sdc with: dd if=/dev/zero of=/dev/sdc bs=8M I suspect I need to prepare it further before it can be added.

Can anyone advise me on this issue? Many Thanks J.