RE: lvm on RH8 _ SOLVED_

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Okay, I might need a lobotomy, but I finally figured out what was going
wrong. Apparently, the lvm module wasn't getting initialised at boot, so I
looked at the lvm HOWTO at the Linux Documentation Project (I really must
get round to donating to them) and this told me how to activate the volumes
and get the module loaded at boot. 

Thanks to everyone who tried to help.

Andy

P.S. If this comes with a long signature I apologise. It's the standard
company signature, and I can't get it removed.

-----Original Message-----
From: Cannon, Andrew [mailto:Andrew.Cannon@xxxxxxxxx]
Sent: Monday, February 09, 2004 2:50 PM
To: 'redhat-list@xxxxxxxxxx'
Subject: RE: lvm on RH8


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@xxxxxxxxxxxx]
Sent: Monday, February 09, 2004 2:42 PM
To: redhat-list@xxxxxxxxxx
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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NNC's UK Operating Companies : NNC Holdings Limited (no. 3725076), NNC Limited (no. 1120437), National Nuclear Corporation Limited (no. 2290928), STATS-NNC Limited (no. 4339062) and Technica-NNC Limited (no. 235856).  The registered office of each company is at Booths Hall, Chelford Road, Knutsford, Cheshire WA16 8QZ except for Technica-NNC Limited whose registered office is at 6 Union Row, Aberdeen AB10 1DQ.  NNC's head office and principal address is Booths Hall and the switchboard number is 01565 633800.  The NNC website is www.nnc.co.uk

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