[linux-lvm] LVM Confusion

[tufkal <tufkal@gmail.com>]

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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.

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