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Old 08-24-2006, 07:54 PM   #1
Malibyte
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Registered: Dec 2001
Location: California, USA
Distribution: Ubuntu, Debian
Posts: 118

Rep: Reputation: 15
Ubuntu/LVM Setup Problem


Hi all -

I'm trying to set up MythTV on an Ubuntu 6.06 (Dapper) box with two SATA drives. The partitions to be used for storing the video files are /dev/sda13 (approx. 250GB) and /dev/sdb1 (300GB).

Those partitions are set up as type 8e (Linux LVM). I have tried fromatting them as ext3 and jfs with the same results. The format goes fine, I can create the physical volumes with pvcreate, but then trying to create the volume group with vgcreate fails:

The first partition:
Code:
root@vader:/etc/default# pvcreate -vv /dev/sda13
File descriptor 3 left open
File descriptor 5 left open
File descriptor 7 left open
    Logging initialised at Thu Aug 24 17:43:25 2006

    Set umask to 0077
pvcreate      Setting global/locking_type to 1
pvcreate      Setting global/locking_dir to /var/lock/lvm
pvcreate      File-based locking enabled.
pvcreate      Locking /var/lock/lvm/P_orphans WB
pvcreate      /dev/sda13: No label detected
pvcreate      /dev/sda13: size is 515847087 sectors
pvcreate      metadata/pvmetadatasize not found in config: defaulting to 255
pvcreate      metadata/pvmetadatacopies not found in config: defaulting to 1
pvcreate      /dev/sda13: size is 515847087 sectors
pvcreate    Set up physical volume for "/dev/sda13" with 515846703 available sectors
pvcreate      Scanning for labels to wipe from /dev/sda13
pvcreate    Zeroing start of device /dev/sda13
pvcreate      Writing physical volume data to disk "/dev/sda13"
pvcreate      /dev/sda13: Writing label to sector 1
pvcreate  Physical volume "/dev/sda13" successfully created
pvcreate      Unlocking /var/lock/lvm/P_orphans
pvcreate    Wiping internal VG cache
So far, so good. The second partition:

Code:
root@vader:/etc/default# pvcreate -vv /dev/sdb1
File descriptor 3 left open
File descriptor 5 left open
File descriptor 7 left open
    Logging initialised at Thu Aug 24 17:44:28 2006

    Set umask to 0077
pvcreate      Setting global/locking_type to 1
pvcreate      Setting global/locking_dir to /var/lock/lvm
pvcreate      File-based locking enabled.
pvcreate      Locking /var/lock/lvm/P_orphans WB
pvcreate      /dev/sdb1: No label detected
pvcreate      /dev/sdb1: size is 625137282 sectors
pvcreate      metadata/pvmetadatasize not found in config: defaulting to 255
pvcreate      metadata/pvmetadatacopies not found in config: defaulting to 1
pvcreate      /dev/sdb1: size is 625137282 sectors
pvcreate    Set up physical volume for "/dev/sdb1" with 625136898 available sectors
pvcreate      Scanning for labels to wipe from /dev/sdb1
pvcreate    Zeroing start of device /dev/sdb1
pvcreate      Writing physical volume data to disk "/dev/sdb1"
pvcreate      /dev/sdb1: Writing label to sector 1
pvcreate  Physical volume "/dev/sdb1" successfully created
pvcreate      Unlocking /var/lock/lvm/P_orphans
pvcreate    Wiping internal VG cache
Again, so far, so good. Now:

Code:
root@vader:/etc/default# vgcreate -v myth_disks /dev/sda13 /dev/sdb1
File descriptor 3 left open
File descriptor 5 left open
File descriptor 7 left open
    Logging initialised at Thu Aug 24 17:46:03 2006

    Set umask to 0077
vgcreate    Wiping cache of LVM-capable devices
vgcreate    Adding physical volume '/dev/sda13' to volume group 'myth_disks'
vgcreate  No physical volume label read from /dev/sda13
vgcreate  /dev/sda13 not identified as an existing physical volume
vgcreate  Unable to add physical volume '/dev/sda13' to volume group 'myth_disks'.
vgcreate    Wiping internal VG cache
OK; pvcreate said both physical volumes were created, but vgcreate won't add the first volume. The same thing happens if I simply give it /dev/sdb1 as the only volume to add.

Can anyone see what I'm doing wrong here? I looked on Ubuntuforums but didn't find anything useful over there.

Thanks in advance --
Bob

Last edited by Malibyte; 08-24-2006 at 09:15 PM.
 
Old 02-05-2007, 06:17 PM   #2
mransel
LQ Newbie
 
Registered: Feb 2007
Posts: 1

Rep: Reputation: 0
/dev/evms

I'm not sure how or why this works, but it worked for me. Instead of using /dev/hdx# use /dev/evms/hdx# (where x is abcdef... and # is the partition number). Must be something funny about the way lvm scans the drives... (it sees /dev/evms/* before it sees the files in /dev) Good Luck!!

Michael
 
  


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