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LVM Help.
http://forums.linhes.org/viewtopic.php?f=5&t=9812		 Page 1 of 2
Author:  hansoffate [ Wed Apr 26, 2006 2:24 pm ]
Post subject:  LVM Help.
I had some problem following the LVM tutorial on the wiki. I realized i did somethign wrong when i tried to mount my /dev/hdb1 and it didn't work. Anyone know what i did wrong?

Thanks,
Hans

Code:
root@mythtv:/home/mythtv# pvcreate /dev/hdb1
  Physical volume "/dev/hdb1" successfully created
root@mythtv:/home/mythtv# vgcreate vg /dev/hdb1
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  Volume group "vg" successfully created
root@mythtv:/home/mythtv# vgdisplay vg | grep "Total PE"
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  Total PE              47694
root@mythtv:/home/mythtv# lvcreate -l 4768 vg -n myth
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  Logical volume "myth" created
root@mythtv:/home/mythtv# Total PE 4768
bash: Total: command not found
root@mythtv:/home/mythtv# lvcreate -l 4768 vg -n myth
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  Logical volume "myth" already exists in volume group "vg"
root@mythtv:/home/mythtv# mount /dev/vg/myth /mnt/hdb1
mount: mount point /mnt/hdb1 does not exist
root@mythtv:/home/mythtv# vgcreate vg /dev/hdb1
  /dev/vg: already exists in filesystem
root@mythtv:/home/mythtv# mke2fs -j -O sparse_super -m0 -i8000000 -L myth /dev/vg/myth
mke2fs 1.36 (05-Feb-2005)
Filesystem label=myth
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
4768 inodes, 4882432 blocks
0 blocks (0.00%) reserved for the super user
First data block=0
149 block groups
32768 blocks per group, 32768 fragments per group
32 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000

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

This filesystem will be automatically checked every 28 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
root@mythtv:/home/mythtv# mount /dev/vg/myth /mnt/hdb1
mount: mount point /mnt/hdb1 does not exist
root@mythtv:/home/mythtv# cp -p -r /myth/* /mnt/hdb1
cp: `/mnt/hdb1': specified destination directory does not exist
Try `cp --help' for more information.
root@mythtv:/home/mythtv# pvcreate /dev/hdb1
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  Can't initialize physical volume "/dev/hdb1" of volume group "vg" without -ff
root@mythtv:/home/mythtv# pvcreate /dev/hdb1
  /dev/hdc: open failed: No medium found
  /dev/hda5: open failed: No such device or address
  /dev/hda6: open failed: No such device or address
  /dev/hda7: open failed: No such device or address
  /dev/hda8: open failed: No such device or address
  /dev/hda9: open failed: No such device or address
  Can't initialize physical volume "/dev/hdb1" of volume group "vg" without -ff
root@mythtv:/home/mythtv# vgcreate vg /dev/hdb1
  /dev/vg: already exists in filesystem
Author:  abrendel [ Wed Apr 26, 2006 4:12 pm ]
Post subject:  Re: LVM Help.
hansoffate wrote:
root@mythtv:/home/mythtv# mount /dev/vg/myth /mnt/hdb1
mount: mount point /mnt/hdb1 does not exist


This is where you should have stopped and said, "Hmm...if it doesn't exist, I should probably create it". No biggie though, here's how to do it.

You need to:
Code:
mkdir /mnt/hdb1
        THEN
mount /dev/vg/myth /mnt/hdb1


Now this part should work fine.
hansoffate wrote:
root@mythtv:/home/mythtv# cp -p -r /myth/* /mnt/hdb1
Author:  tjc [ Wed Apr 26, 2006 6:47 pm ]
Post subject: 
You should really be using the nice create_lvm.sh script that Cecil wrote for this... It deals with all these issues for you. It's documented right on the wiki page in the 2nd paragraph...

Also, if you do that, then everything is nice and standard and the recreate_lvm.sh script will make your next upgrade that much easier.
Author:  hansoffate [ Wed Apr 26, 2006 6:59 pm ]
Post subject: 
Is it too late to try to run cecil's script?

Anyways i tried to do it manually but then this happened.
Sorry for my noobiness.

Code:
root@mythtv:/home/mythtv# mkdir /mnt/hdb1
root@mythtv:/home/mythtv# mount /dev/vg/myth /mnt/hdb1
mount: /dev/vg/myth is not a valid block device
Author:  hansoffate [ Wed Apr 26, 2006 9:45 pm ]
Post subject: 
for some reason i think it worked... but it doesn't show up when i type cfdisk.

It only shows the partitions on hda.
But when i go to my /mnt/hdb1
It shows all /myth/ files in there so i think its working.

I realized it did work because when i went to find out how much unused diskspace i have it says that i only have a total of 19 gb.

hdb1 should be my entire partition and it should be around 200 gb.
Is there anyway to delete everythign done with lvm that has to do with hdb and re run the script?

thanks
-Hans
Author:  hansoffate [ Thu Apr 27, 2006 10:55 pm ]
Post subject: 
I'm going to try to rerun the script. Is there a command to format my hdb harddrive. I don't think i need anything on there (i may have /myth/tv on there but will it be recreated).

thanks,
Hans
Author:  tjc [ Fri Apr 28, 2006 6:53 am ]
Post subject: 
One possibility using EXT3 is:
Code:
mke2fs -j -O sparse_super -m0 -i8000000 -L myth /dev/vg/myth

Lots of folks have been using XFS however, because of it's better large file behaviour. Sadly I don't have an example handy for that...
Author:  hansoffate [ Fri Apr 28, 2006 10:25 am ]
Post subject: 
Thanks tjc. So that will reformat the drive so i can re run the script?
When i do the df, this is what i get.

Code:
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda1              4820232   2326868   2249204  51% /
/dev/hda3             19527808   2416780  17111028  13% /myth
/dev/vg/myth          19527808   2416780  17111028  13% /myth
/dev/vg/myth          19527808   2416780  17111028  13% /mnt/hdb1
Author:  tjc [ Fri Apr 28, 2006 9:34 pm ]
Post subject: 
Well, you've got a little problem there with two (oops make that three) things mounted on /myth you need to sort that out first. Once you do that the command should allow you to format the LVM volume.
Author:  hansoffate [ Sat Apr 29, 2006 10:23 am ]
Post subject: 
If i format my c drive and reinstall knoppmyth will it fix the problem i made?

Sorry for being so stupid.
(next time i install should i do a manual install? And make hda my /, /cache, and /swap. And make hdb for all my /myth. ) Will that delete everything on my hda and hdb? and also could i run the script when setting up the /myth directory on hdb?
Author:  tjc [ Sat Apr 29, 2006 11:05 am ]
Post subject: 
Uhm... Sorry I'm still not firing on all 5 cylinders today so I'll go for simple answers. Reinstalling using an auto install should get you back to a good state. It's been several weeks since the last time I did this but it should take care of the formating itself.

After it reboots, and before you enter the root password to complete setup, flip to an alternate virtual console (Hit Ctrl-Alt-F1 and you should see a text console - all back with white text with nothing but a login prompt), login as root there, and run the create_lvm.sh script. You should specify the names of all the devices you want to be part of the /myth volume on the command line. For example in R5B7 if you've got two drives installed as the primary master (partiitoned by an auto install) and primary slave (unpartitioned) this might be:
Code:
create_lvm.sh /dev/hda3 /dev/hdb1

When that finishes you'll need to create the filesystem (using mkfs or it's kin) of your choice on the new pseudo device /dev/vg/myth as described above. After this is done mount the new LVM partitiion using:
Code:
mount /myth

Flip back to the graphical console (Ctrl-Alt-F7), and enter the root password to continue the install.
Author:  hansoffate [ Sat Apr 29, 2006 12:54 pm ]
Post subject: 
Thanks tjc. I'll wait to reinstall when i get my nvidia 5200 (so i am sure it will work).

My hdb i think is partitioned and has data on it already,i think.
(/dev/vg/myth 19527808 2416780 17111028 13% /mnt/hdb1 )

Do i need to format it before i do my reinstall? If so what command can i use to format my hdb drive.

Thank you so much tjc and all others for the help
-Hans
Author:  tjc [ Sat Apr 29, 2006 1:00 pm ]
Post subject: 
Unless it's been broken into chunks (partitioned) it should be just fine. You can check it with cfdisk like this:
Code:
cfdisk -Ps /dev/hdb

If it only shows one entry in the partition table you're golden.
Author:  hansoffate [ Sat Apr 29, 2006 2:21 pm ]
Post subject: 
k Thanks.

Partition Table for /dev/hdb

First Last
# Type Sector Sector Offset Length Filesystem Type (ID) Flag
-- ------- ----------- ----------- ------ ----------- -------------------- ----
1 Primary 0 390716864 63 390716865 Linux LVM (8E) None


That doesn't seem like 200 gbs? is it?
-hans
Author:  tjc [ Sat Apr 29, 2006 5:30 pm ]
Post subject: 
Yes. The number is in sectors. So that's exactly what you wanted to see.
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