Confusion over LVM

Wed Jan 17 12:39:39 UTC 2007

Hi all,

Thanks for everyone who contributed suggestions, etc to my previous 
query - see below.

However I seem to have a more fundamental problem in the CLI -
bash - which reports that lvm commands commands aren't recognised. Any
idea what on earth that could be? Sorry to appear so dumb!

For example:
[root at localhost andrew]# pvcreate /dev/hdd
bash: pvcreate: command not found

It's odd as command 'ls' is working fine, and when I run 'yum install
lvm2' then that reports 'nothing to do'.

Andrew Wood, Oxford.

> 127 **
>
> Message: 14
> Date: Mon, 15 Jan 2007 19:09:09 +0100
> From: Remi Collet <Fedora at FamilleCollet.com>
> Subject: Re: Confusion over LVM
> To: For users of Fedora <fedora-list at redhat.com>
> Message-ID: <45ABC345.9030309 at FamilleCollet.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Andrew Wood a écrit :
> > > Dear all,
> > >
> > > I'm using FC6. I  have a 8 gbyte disk on my pc, and I've justed added
> > > another. Easy enough, ensuring the jumpers for master slave are 
> set, etc.
> > >
> > > I am a bit confused about the LVM. I used this, via the graphical 
> front
> > > end to add the new physical volume.
>
> You have extend the "Volume Group"
>
> > >
> > > I must have missed something, or do I have unfounded expectations 
> of how
> > > LVM works (i.e. seemlessly)?
>
> I think you need to extent the "Logical Volume".
> Think it's not possible with graphical tools (require to umount the
> filesystem) with current version...
>
> You should
> 1/ extent the Logical Volume (lvextent)
> 2/ extent the filesystem (resize2fs)
>
> Remi
>
> 128 **
>
> Message: 4 Date: Tue, 16 Jan 2007 00:33:15 +0530 From: "Anil Kumar 
> Sharma" <xplusaks at gmail.com> Subject: Re: Confusion over LVM To: "For 
> users of Fedora" <fedora-list at redhat.com> Message-ID: 
> <52fe6b680701151103i7f3d7990wda497950d8413ce2 at mail.gmail.com> 
> Content-Type: text/plain; charset="iso-8859-1"
> > >
> > >
> > > I think you need to extent the "Logical Volume".
> > > Think it's not possible with graphical tools (require to umount the
> > > filesystem) with current version...
> > >
> > > You should
> > > 1/ extent the Logical Volume (lvextent)
> > > 2/ extent the filesystem (resize2fs)
> > >
> > > Remi
> > >
> > > --
> > > fedora-list mailing list
> > > fedora-list at redhat.com
> > > To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
> > >
>
> Since your space is vacant you may experiment but my experience with LVM
> tells this
> 1. LVM is a very nice and powerful tool
> 2. It is basically meant for long term deployment. i.e. you may find it
> difficult to make frequent changes especially if space outside LVM is less
> than space inside LVM.
> 3. Generally, You may leave ample space outside LVM and very conveniently
> add it to your LVM structure later on, as you gain confidence.
> 4. As you get familiar with LVM intricacies, you can plan a more optimised
> initial configuration (when you re-configure - you will do that).
> 5. MoS : Keep flexibility to begin with LVM or master it.
>
> LVM - is it supposed to perform faster also, especially on SATA hardware,
> and optimised drivers?
>
> -- Anil Kumar Shrama -------------- next part -------------- An HTML 
> attachment was scrubbed... URL: 
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> ------------------------------
>
>
> ** 130
>
> Message: 2
> Date: Mon, 15 Jan 2007 23:32:58 +0100
> From: Ambrogio <fn050202 at flashnet.it>
> Subject: Re: Confusion over LVM
> To: For users of Fedora <fedora-list at redhat.com>
> Message-ID: <1168900379.3873.26.camel at delo.gdit.it>
> Content-Type: text/plain
>
> Il giorno lun, 15/01/2007 alle 17.55 +0000, Andrew Wood ha scritto:
> > > Dear all,
> > >
> > > I'm using FC6. I  have a 8 gbyte disk on my pc, and I've justed added
> > > another. Easy enough, ensuring the jumpers for master slave are 
> set, etc.
> > >
> > > I am a bit confused about the LVM. I used this, via the graphical 
> front
> Many people are confused abot LVM.
>
> A usefull link by wich you can learn about LVM is provided by IBM.
>
> I don't remember the links but Searching with google for ibm lvm I found
> that
> http://www-128.ibm.com/developerworks/linux/library/l-lvm/
>
> Bye
>  Ambrogio
>
>
>
> ------------------------------
>
> ** 130
>
> Message: 5 Date: Mon, 15 Jan 2007 22:39:59 +0000 From: AJ Mitchelson 
> <aj.mitchelson at btconnect.com> Subject: Re: Confusion over LVM To: For 
> users of Fedora <fedora-list at redhat.com> Message-ID: 
> <1168900799.15871.30.camel at ajm.is-a-geek.com> Content-Type: 
> text/plain; charset=UTF-8 On Mon, 2007-01-15 at 19:09 +0100, Remi 
> Collet wrote:
> > > Andrew Wood a Ã©crit :
> >> > > Dear all,
> >> > >
> >> > > I'm using FC6. I  have a 8 gbyte disk on my pc, and I've justed 
> added
> >> > > another. Easy enough, ensuring the jumpers for master slave are 
> set, etc.
> >> > >
> >> > > I am a bit confused about the LVM. I used this, via the 
> graphical front
> >> > > end to add the new physical volume.
> > >
> > > You have extend the "Volume Group"
> > >
> >> > >
> >> > > I must have missed something, or do I have unfounded 
> expectations of how
> >> > > LVM works (i.e. seemlessly)?
> > >
> > > I think you need to extent the "Logical Volume".
> > > Think it's not possible with graphical tools (require to umount the
> > > filesystem) with current version...
> > >
> > > You should
> > > 1/ extent the Logical Volume (lvextent)
> > > 2/ extent the filesystem (resize2fs)
> > >
> > > Remi
> > >
>
> LVM is a very cool and powerful piece of kit ... allowing the addition
> (and removal) of storage with relative ease (Easy for me to say I've
> been messing around with this stuff for over 10 years).
>
> Anyway what you need to do is initialise the the new hard drive before
> you can extend the volume group onto it (Im working on the assumption
> here that you've not partioned the disk and what to use the whole drive
> in the volume group)
>
> # pvcreate /dev/hdX (where hdX is the new drive)
>
> e.g pvcreate /dev/hdb
>
> (Have a look at the man page for pvcreate as well)
>
> Once the above command has completed you can bring that disk into your
> existing volume group
>
> # vgextend <Volume Group Name> /dev/hdX
>
> e.g. vgextend VolGroup00 /dev/hdb
>
> (Have a look at the man page for vgextend as well)
>
> Where <Volume Group Name> is your existing volume group and /dev/hdX is
> the same as you used in the pvcreate command
>
> Once the above has completed successfully you can then extend the
> logical volume that holds the file system you're filling up
>
> # lvextend -L +NN[mg] /dev/VGName/LVName PhysicalVolume
>
> e.g. lvextend -L +10g /dev/VolGroup00/LogVol00 /dev/hdb
>
> (Have a look at the man page for vgextend as well)
>
> Where +NN is the amount of space you want to ADD and [mg] is either
> megabytes or gigabytes (it will do kilobytes and terabytes as well if
> need be) and VGName is the volume group you used in the vgextend step
> and LVName is the logical volume name and PhysicalVolume is the hard
> drive you used in the pvcreate step.
>
> Once the above is complete you can then resize your filesystem be using
> the correct utility for the type of filesystem you're using.
>
> All of the above (and potentially the file system resize) can be done
> while your machine is up and running as well.
>
> I'd read up about LVM and just double check the syntax (I am doing this
> from memory and it is late here)
>
> HTH
>
> AJ
>
>
>
>
> ------------------------------
>
>
>

Tom Spec wrote:
> Adding a new disk to LVM is a bit complicated.  If you want I can work 
> with you over email to do it.
>
> I'd need the output of the following commands:
>
> fdisk -l
> vgdisplay
> df
>
>