LVM How-To by Lennart

[Merv Curley]

On Monday 15 January 2007 16:18, Lennart Sorensen wrote:
> On Fri, Jan 12, 2007 at 08:09:15PM -0500, Merv Curley wrote:
> > Thanks for the instructions Lennart. From what stuck in the grey cells
> > from the HOW-TO,  it seemed to make sense.  I assume that somewhere in
> > the second stage I format the 'newdisk' with ext3 to match the present
> > part of the logical volume?
>
> No.  You are extending an existing filesystem I imagine.  If you don't 
> want to expand an existing logical volume, you can create a new logical
> volume with lvcreate and format that afterwards.
>
hda on the Myth system, has a primary partition for /boot, a VolumeGroup 
[rootvg]  for the  Myth install  / and the swap;  and a VolumeGroup for 
Myth Data [videovg].  I have a 320 GB drive [hdb] that I thought could 
extend the videovg group.

>
> The vgdisplay should show how many free extents are unused (not used by
> any logical volume).  That is how many extents you can potentially add
> to any existing logical volume.
>
Well it seems that vgdisplay didn't return what it should have because I 
didn't use the  VolumeGroup name.  I just tried again and

 vgdisplay videovg     [now sez among other things]

Max PV   0  0     Cur PV  1   1      Act PV  1  1
VG size 225.88   PE Size 32 MB
Total PE 7228
Alloc PE/Size  7227 / 225.88
Free PE/Size  1 / 32 MB

Is that better?  How many free extents are there, just 1?  Is this second 
drive going to be videolv02 for mounting purposes in fstab and a part of 
the 'videovg group?  presently fstab is
 
2 entries  for rootvg,  one is  /,  and another   swap
and
/dev/videovg/videolv01    /video     ext3	   defaults    0 0	


> > Something went disasterously wrong this afternoon, this computer locked
> > up and I had to power down. When I restarted it, it just wouldn't
> > reboot, about 10 error messages, ending something like, ' this
> > shouldn't happen, but it did '. Nothing like a programmer with a sense
> > of humor.
> >
> > At any rate, tonight after supper, I fired it up, I think every
> > partition on 2 drives had errors, this is the first thing I've tried
> > and all of todays messages are lost somewhere.  Luckily I wrote all
> > your instructions down and was able to check the first 4 steps  to see
> > about these extents.
>
Stupid me, I booted into the wrong distro and unison hadn't brought it up to 
date for mail.

> Any chance you knocked a cable loose when you were adding the drive?
>
This wasn't the computer that has Myth on it. It looks like the hard drive 
was 'on the edge'. Started taking the Bios ages to read it, then a minute 
to find the grub menu, another minute to actually display it.  A new drive 
installed, the old one is in a USB case and I am slowly getting files and 
directories off it. Hellofa job.


> > 'man fsck' doesn't reveal an -f option, perhaps that applies to LVM.
>
> I should have said fsck.ext3 -f not just fsck.
>
> So what have you done so far?

With Myth.,  nothing.  Got to figure out this extents thing, so I can 
increase the size of the Myth 'data directory' for all the recordings that 
are happening.  I didn't realize that every minute of TV that I watch is 
saved to the hard drive. I realize that they are temporary files but with 
the novelty, I am using up a lot of space.  Plus making recordings of 
movies that I haven't seen in some time. if the wife starts recording shows 
and watching TV on her computer, then I'll need lots of storage space.
>
> --
SuSE 10.2 hasn't been too bad so far, but it will take me a day or two to 
try the things that bugged me about 10.0 and 10.1.  I only have a network 
install for Debian, so it takes a while to DL all the graphical stuff and 
get myself back in more familiar territory.

Cheers

-- 
Merv Curley
Toronto, Ont. Can

SuSE 10.2 Linux    
Desktop  KDE 3.5.5    KMail 1.9.5



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