This is kind of a long story but I will try to keep it simple. I have a linux file/web/mythtv/blah server that I run at my business. I recently added a 120GB and a 80GB drive to the machine. Here was the setup prior to that. 120GB Seagate -9GB / ext3 -1GB Swap -110GB lvmhome xfs 120GB Seagate -120GB lvmhome xfs The 2 lvm partitions were used together as a ~220GB /home partition, and everything worked well. Then I decided to add the 2 new drives. The geometry now looks like this 120GB Seagate -9GB / ext3 -1GB Swap -110GB lvmhome xfs 120GB Seagate -120GB lvmhome xfs 120GB Seagate -80GB lvmhome xfs -40GB /home/me linuxraid 80GB Seagate -40GB lvmhome xfs -40GB /home/me linuxraid I setup 40GB on each new drive apart in a raid1 mirror using mdadm. Then with the 120GB of new LVM space due to me, I tried to add it to my LVM home. I am unable to get the space. Here are the outputs of a few commands for some help. tufkal@tux:/home$ sudo lvm lvscan Password: ACTIVE '/dev/lvmhome/home' [325.82 GB] inherit tufkal@tux:/home$ sudo lvm pvscan PV /dev/hdb5 VG lvmhome lvm2 [107.39 GB / 0 free] PV /dev/hdc5 VG lvmhome lvm2 [ 110.23 GB / 0 free] PV /dev/sdb5 VG lvmhome lvm2 [35.46 GB / 0 free] PV /dev/sda5 VG lvmhome lvm2 [72.73 GB / 0 free] Total: 4 [325.82 GB] / in use: 4 [325.82 GB] / in no VG: 0 [0 ] tufkal@tux :/home$ sudo lvm vgscan Reading all physical volumes. This may take a while... Found volume group "lvmhome" using metadata type lvm2 tufkal@tux:/home$ According to those, everything looks great! I should have 325GB of space! tufkal@tux:/home$ cat /etc/fstab | grep lvm /dev/mapper/lvmhome-home /home xfs defaults 0 2 And my /home is mounted on my lvm..... tufkal@tux:~$ df -h Filesystem Size Used Avail Use% Mounted on /dev/hdb1 4.4G 3.0G 1.2G 72% / tmpfs 253M 0 253M 0% /dev/shm tmpfs 253M 13M 240M 5% /lib/modules/2.6.12-10-386/volatile /dev/mapper/lvmhome-home 218G 197G 22G 91% /home /dev/md0 39G 29G 7.7G 80% /home/tufkal BWAH? Why do I only have 220GB of space? I run out of space almost nightly when MythTV starts transcoding the day's recordings. I gave up trying to figure out what I did wrong and I ask of you. More random command line pastes in case they help. tufkal@tux:~$ sudo lvm vgs Password: VG #PV #LV #SN Attr VSize VFree lvmhome 4 1 0 wz--n 325.82G 0 tufkal@tux:~$ sudo lvm pvs PV VG Fmt Attr PSize PFree /dev/hdb5 lvmhome lvm2 a- 107.39G 0 /dev/hdc5 lvmhome lvm2 a- 110.23G 0 /dev/sda5 lvmhome lvm2 a- 72.73G 0 /dev/sdb5 lvmhome lvm2 a- 35.46G 0 tufkal@tux:~$ sudo lvm lvs LV VG Attr LSize Origin Snap% Move Copy% home lvmhome -wi-ao 325.82G tufkal@tux:~$ sudo lvm vgdisplay --- Volume group --- VG Name lvmhome System ID Format lvm2 Metadata Areas 4 Metadata Sequence No 96 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 4 Act PV 4 VG Size 325.82 GB PE Size 4.00 MB Total PE 83409 Alloc PE / Size 83409 / 325.82 GB Free PE / Size 0 / 0 VG UUID 8BCR28-5oEl-heGV-97YY-k6Dy-gzaO-QdZcML tufkal@tux:~$ sudo lvm pvdisplay --- Physical volume --- PV Name /dev/hdb5 VG Name lvmhome PV Size 107.39 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 27493 Free PE 0 Allocated PE 27493 PV UUID DIuF4I-JfQH-w1nB-dJlM-0zef-R9An-MWxkLe --- Physical volume --- PV Name /dev/hdc5 VG Name lvmhome PV Size 110.23 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 28219 Free PE 0 Allocated PE 28219 PV UUID A3uL70-LwK6-61Vx-DoGj-8C7v-Ml7E-9JnWtM --- Physical volume --- PV Name /dev/sdb5 VG Name lvmhome PV Size 35.46 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 9079 Free PE 0 Allocated PE 9079 PV UUID yo14mv-oyRd-Up5z-DBj2-lEPO-jACe-su53bV --- Physical volume --- PV Name /dev/sda5 VG Name lvmhome PV Size 72.73 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 18618 Free PE 0 Allocated PE 18618 PV UUID sT4CZO-gIZu-c05A-rrQf-uNw9-zC3B-p5h2vV tufkal@tux:~$ sudo lvm lvdisplay --- Logical volume --- LV Name /dev/lvmhome/home VG Name lvmhome LV UUID WrEbxl-7pck-lwbJ-w3V7-BNiZ-ttge-QvIL9r LV Write Access read/write LV Status available # open 1 LV Size 325.82 GB Current LE 83409 Segments 4 Allocation inherit Read ahead sectors 0 Block device 253:0 tufkal@tux:~$ AND WHILE IM AT IT, FOR FUTURE REFERENCE What is the correct way to add a partition to a LVM (like if I slap another drive in there). Thanks in advance.