[mythtv-users] LVM problem

griz_quattro griz_quattro at tx.rr.com
Sun Dec 24 18:40:17 UTC 2006

griz_quattro wrote:

> Warren Sturm wrote:
>>On Sun, 2006-12-24 at 12:10 -0600, griz_quattro wrote:
>>>Warren Sturm wrote:
>>>>On Sun, 2006-12-24 at 11:47 -0600, griz_quattro wrote:
>>>>>I am a newb to Linux. Been following FC6 guide at
>>>>>http://wilsonet.com/mythtv/fcmyth.php but cannot
>>>>>get my volume group "seen".
>>>>>Searching and using http://mythtv.org/docs/mythtv-HOWTO.html#toc24.1
>>>>>and http://tldp.org/HOWTO/LVM-HOWTO/ for answers to where I missed a
>>>>>step but I am at a loss. Google seemed to point to recovering from a 
>>>>>failed LVM drive
>>>>>I setup LVM at install when loading FC6 (Fedora) on two 300gb hdd,
>>>>>using both for Volume Group called "Video_Vol". First HDD is sda
>>>>>has the system partitions on sda1 thru sda5, second HDD is sdb
>>>>>with partition sdb1, and third HDD is sdc with partition sdc1. The
>>>>>second and third HDD are the Volume Group called "Video_Vol".
>>>>>I am not certain of what nor how to get the VG "seen". Any pointers
>>>>>would be appreciated. If I am posting to the wrong list, please,
>>>>>let me know and I will move on.
>>>>	At what point did you create the logical volume(s)?  This is
>>>>	showing that none were created and all the space in the volume
>>>>	group is showing as free (unused).
>>>>	You need to do the lvcreate.  for example:
>>>>		lvcreate -n video -L 558.88G Video_Vol
>>>>	this will create 1 logical volume that should pretty well take
>>>>	up all the volume group space.
>>>>	Then you can put on the filesystem
>>>>	mke2fs -m0 -L/video -j /dev/Video_Vol/video
>>>Tried it, but don't understand it.
>>>[root at mythtv /]# lvcreate -n video -L 558.88G Video_Vol
>>>  Rounding up size to full physical extent 558.91 GB
>>>  Insufficient free extents (17884) in volume group Video_Vol: 17885 
>>ok.  maybe try this
>>	lvcreate -n video -l 17884 Video_Vol
>>then create whichever filesystem type you are comfortable with.  Doesn't
>>necessarily have to be ext3.
> OK, that made it work. i'll post the results after the
> "Writing inode tables:" completes.
> I see now what I did. I assumed that since the installer created
> the physical volumes (pv) and the volume groups (vg) that is also 
> created the logical volumes (lv). I assumed wrong.
Here are the results of the lvcreate, lvdisplay, mke2fs, and vgdisplay.
It all appears to be in working order.

[root at mythtv /]# lvcreate -n video -l 17884 Video_Vol
   Logical volume "video" created
[root at mythtv /]# lvdisplay
   --- Logical volume ---
   LV Name                /dev/Video_Vol/video
   VG Name                Video_Vol
   LV UUID                3bfL1V-GJmg-LHyC-XXNW-sgoR-igRB-A2Py23
   LV Write Access        read/write
   LV Status              available
   # open                 0
   LV Size                558.88 GB
   Current LE             17884
   Segments               2
   Allocation             inherit
   Read ahead sectors     0
   Block device           253:0

[root at mythtv /]# mke2fs -m0 -L/video -j /dev/Video_Vol/video
mke2fs 1.39 (29-May-2006)
Filesystem label=/video
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
73252864 inodes, 146505728 blocks
0 blocks (0.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
4471 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
         32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 
         4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 25 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

[root at mythtv /]# vgdisplay
   --- Volume group ---
   VG Name               Video_Vol
   System ID
   Format                lvm2
   Metadata Areas        2
   Metadata Sequence No  2
   VG Access             read/write
   VG Status             resizable
   MAX LV                0
   Cur LV                1
   Open LV               0
   Max PV                0
   Cur PV                2
   Act PV                2
   VG Size               558.88 GB
   PE Size               32.00 MB
   Total PE              17884
   Alloc PE / Size       17884 / 558.88 GB
   Free  PE / Size       0 / 0
   VG UUID               szYlX8-rtrD-tqG8-eLXU-GGHQ-9wr4-LgxRku

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