RE: lvm on RH8

• Previous message: Ken Rossman: "Re: lvm on RH8"
• Maybe in reply to: Cannon, Andrew: "lvm on RH8"
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To: "'redhat-list@redhat.com'" <redhat-list@redhat.com>
Date: Mon, 9 Feb 2004 14:50:08 -0000

Find attached the method I used (along with some output) to create the
logical volume (note, I think I missed copying some of the screen at some
point)

Unmount /work7 using the command umount -f /work7

Using fdisk, change the partition usage to 0x8e (free space, logical
partition) as shown in this text dump from the screen)

   p print the partition table
   t change a partition's system id
   w write table to disk and exit

Command (m for help): p

Disk /dev/hdb: 16 heads, 63 sectors, 19841 cylinders
Units = cylinders of 1008 * 512 bytes

   Device Boot Start End Blocks Id System
/dev/hdb1 * 1 1560 786208+ 82 Linux swap
/dev/hdb2 1561 19841 9213624 83 Linux

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 0x8e
Type 0 means free space to many systems
(but not to Linux). Having partitions of
type 0 is probably unwise. You can delete
a partition using the `d' command.
Changed system type of partition 2 to 0 (Empty)

Command (m for help): p

Disk /dev/hdb: 16 heads, 63 sectors, 19841 cylinders
Units = cylinders of 1008 * 512 bytes

   Device Boot Start End Blocks Id System
/dev/hdb1 * 1 1560 786208+ 82 Linux swap
/dev/hdb2 1561 19841 9213624 0 Empty

Once this is completed, exit and write to the partition table (Option w).

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or
resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.

Then use pvcreate to crate a volume group that will contain the logical
volumes /userg and /work7.

[root@cluster01 root]# pvcreate /dev/hdb2
pvcreate -- physical volume "/dev/hdb2" successfully created

Now use lvcreate to create the logical volumes userg and work7.

[root@cluster01 root]# lvcreate -L 4000 -n userg cluster01vg
lvcreate -- doing automatic backup of "cluster01vg"
lvcreate -- logical volume "/dev/cluster01vg/userg" successfully created

[root@cluster01 root]# lvcreate -L 4000 -n work7 cluster01vg
lvcreate -- doing automatic backup of "cluster01vg"
lvcreate -- logical volume "/dev/cluster01vg/work7" successfully created

Note that the -L option is the volume size and -n is the name of the logical
volume.

Next the filesystem needs to be created in the logical volumes. This is
performed by the mkfs command.

[root@cluster01 root]# mkfs -t ext3 /dev/cluster01vg/work7
mke2fs 1.27 (8-Mar-2002)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
512000 inodes, 1024000 blocks
51200 blocks (5.00%) reserved for the super user
First data block=0
32 block groups
32768 blocks per group, 32768 fragments per group
16000 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 35 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@cluster01 root]# mkfs -t ext3 /dev/cluster01vg/userg
mke2fs 1.27 (8-Mar-2002)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
512000 inodes, 1024000 blocks
51200 blocks (5.00%) reserved for the super user
First data block=0
32 block groups
32768 blocks per group, 32768 fragments per group
16000 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 38 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

The error messages I've getting are all a variation on the following:

[root@cluster01 root]# lvdisplay /dev/cluster01vg/userg
lvdisplay -- volume group "cluster01vg" of logical volume
"/dev/cluster01vg/userg"is not active
lvdisplay -- try -D, please

[root@cluster01 root]# lvscan
lvscan -- volume group "cluster01vg" is NOT active; try -D
lvscan -- no logical volumes found

Using lvscan -D:-

[root@cluster01 root]# lvscan -D
lvscan -- reading all physical volumes (this may take a while...)
lvscan -- inactive "/dev/cluster01vg/userg" [3.91 GB]
lvscan -- inactive "/dev/cluster01vg/work7" [3.91 GB]
lvscan -- 2 logical volumes with 7.81 GB total in 1 volume group
lvscan -- 2 inactive logical volumes

Anyone with any ideas?

Andy
-----Original Message-----
From: Ken Rossman [mailto:rossman@columbia.edu]
Sent: Monday, February 09, 2004 2:42 PM
To: redhat-list@redhat.com
Cc: Ken Rossman
Subject: Re: lvm on RH8

On Monday, February 9, 2004, at 09:33 AM, Cannon, Andrew wrote:
> I'm trying to get lvm working on one of our systems. I've gone through
> the
> steps (as given in the man pages) and tried to mount the filesystem. I
> couldn't mount the filesystem.

What error messages do you get? This would be helpful in debugging.

Dumb question, but, did you build a file system on the newly created
logical volume?

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• Previous message: Ken Rossman: "Re: lvm on RH8"
• Maybe in reply to: Cannon, Andrew: "lvm on RH8"
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