[linux-lvm] How to move /usr from LVM back to non-LVM?

[linux-lvm] How to move /usr from LVM back to non-LVM?

[Charles Marcus]

Hello,

Ok, resizing my /var partition was without incident, so thanks much to 
the replies I got for reassurance...

Now, I have another thing I'd like to do, but it is only incidentally 
LVM related...

When this system was first set up - not by me - they put /home, /usr and 
/var on LVM partitions.

I'm fine with /home and /var, but I'd like to put /usr back as part of 
the / partition...

Has anyone ever done something like this before?

I'm thinking something along the lines of:

1. Boot off of livecd

2. mount /

3. Mount /usr

4. cp /usr to /usr2 on /

5. umount /usr

6. mv /usr2 /usr

?

Thanks for any comments/suggestions/how-to pointers...

-- 

Best regards,

Charles

Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Georges Giralt]

Charles Marcus a �crit :
> Hello,
> 
> Ok, resizing my /var partition was without incident, so thanks much to 
> the replies I got for reassurance...
> 
> Now, I have another thing I'd like to do, but it is only incidentally 
> LVM related...
> 
> When this system was first set up - not by me - they put /home, /usr and 
> /var on LVM partitions.
> 
> I'm fine with /home and /var, but I'd like to put /usr back as part of 
> the / partition...
> 
> Has anyone ever done something like this before?
> 
> I'm thinking something along the lines of:
> 
> 1. Boot off of livecd
> 
> 2. mount /
> 
> 3. Mount /usr
> 
> 4. cp /usr to /usr2 on /
> 
> 5. umount /usr
> 
> 6. mv /usr2 /usr
> 
> ?
> 
> Thanks for any comments/suggestions/how-to pointers...
> 
Hi !
As file rights and protection are important on /usr,
Consider replacing #4 with :
(cd /usr && tar cf - . ) | (cd /usr2 && tar xpf -) as root
or if you prefer
still as root
dump 0uaf - /usr | (cd /usr2 && restore -rf -)
In this second way, you do not need to mount the original /usr (but in 
this case you've to give the device file to dump instead of /usr)
But some people will question the reason you will move from LVM to plain 
filesystem/partitioning....
-- 
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Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Charles Marcus]

On 4/28/2008, Georges Giralt (georges.giralt@free.fr) wrote:
> But some people will question the reason you will move from LVM to 
> plain filesystem/partitioning.... 

Good point... and maybe my reason is not a 'good one'... ;)

My thinking is, since /usr is a critical system partition, it should be 
on the main system drive - which I always set up as a simple 2 drive mirror.

So, I'm now curious how/what other people generally use LVM for?

-- 

Best regards,

Charles

Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Stuart D. Gathman]

On Mon, 28 Apr 2008, Charles Marcus wrote:

> On 4/28/2008, Georges Giralt (georges.giralt@free.fr) wrote:
> > But some people will question the reason you will move from LVM to 
> > plain filesystem/partitioning.... 
> 
> Good point... and maybe my reason is not a 'good one'... ;)
> 
> My thinking is, since /usr is a critical system partition, it should be 
> on the main system drive - which I always set up as a simple 2 drive mirror.

I made that mistake on one system.

> So, I'm now curious how/what other people generally use LVM for?

And now I regret it because I can't use snapshots to take backups
of the system.  The only drawback to LVM is that initrd is trickier.
And a good LiveCD makes it possible to recover from boot problems -
even remotely. 

-- 
	      Stuart D. Gathman <stuart@bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Charles Marcus]

On 4/28/2008, Stuart D. Gathman (stuart@bmsi.com) wrote:
>> So, I'm now curious how/what other people generally use LVM for?

> And now I regret it because I can't use snapshots to take backups
> of the system.  The only drawback to LVM is that initrd is trickier.
> And a good LiveCD makes it possible to recover from boot problems -
> even remotely.

Good point...

Actually my question was incomplete... it should have read:

I'm curious what partitions/directories other people use LVM for?

-- 

Best regards,

Charles

Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Mark H. Wood]

[-- Attachment #1: Type: text/plain, Size: 1023 bytes --]

I usually set up three partitions:

/boot
/
LVM

I don't use an initrd.  I give '/boot' a partition -- the first
partition -- to avoid any possibility of problems with the BIOS being
able to find secondary loaders, kernels, and the like.  So little goes
here that I can be very generous and never have to think about
resizing, and it'll still be tiny w.r.t. modern drive sizes.

The root volume is a partition because I don't do initrd.  Mostly it's
just mount points, critical libraries, kernel modules, and ~root.
Again, I can size it generously without significant waste.

Everything else, even swap, goes into LVM so it's easy to resize.
I've not yet found time to play with snapshotting.

If the box maker provides a diagnostic partition image, it goes in
between '/boot' and '/'.

On a server box, this is all atop hardware RAID.

-- 
Mark H. Wood, Lead System Programmer   mwood@IUPUI.Edu
Typically when a software vendor says that a product is "intuitive" he
means the exact opposite.


[-- Attachment #2: Type: application/pgp-signature, Size: 197 bytes --]

Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Georges Giralt]

Charles Marcus a �crit :
> On 4/28/2008, Georges Giralt (georges.giralt@free.fr) wrote:
>> But some people will question the reason you will move from LVM to 
>> plain filesystem/partitioning.... 
> 
> Good point... and maybe my reason is not a 'good one'... ;)
> 
> My thinking is, since /usr is a critical system partition, it should be 
> on the main system drive - which I always set up as a simple 2 drive 
> mirror.
> 
> So, I'm now curious how/what other people generally use LVM for?
> 
Just my 2 � here. I do not pretend to have the TRUTH ....
Said you've 2 identical drives for the system.
Set up  2 partitions onto them exactly the same.
The fisrt one,  small will be used for /boot
The second one for everything else using LVM.
Set up software raid to make a first mirror of the two /boot
and another one for the LVM.
This way, you can boot and run your machine from any disk and you can 
even do a backup by splitting the raid....
IT has always worked except on my home machine where I was unable to 
insatall a Fedora system using software mirror AND lvm ..; Go figure ;-)

-- 
Ce message est constitu� d'au moins 50 % d'�lectrons recycl�s.
S'il vous pla�t, aidez nous � conserver nos ressources,
recyclez vos �lectrons !

Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Bryn M. Reeves]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Georges Giralt wrote:
> insatall a Fedora system using software mirror AND lvm ..; Go figure ;-)

Was this because you were using text mode for configuration (the curses
UI doesn't allow this), or did you hit some other problem?

Regards,
Bryn.

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Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org

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Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Stuart D. Gathman]

On Mon, 28 Apr 2008, Mark H. Wood wrote:

> If the box maker provides a diagnostic partition image, it goes in
> between '/boot' and '/'.

Yes, I wish more "box makers" did that.  Too many provide hardware diagnostics
that require Windows.  I don't care what OS the diagnostics use if they
actually *provide* a stripped down version of that OS in a diagnostic
partition (which thankfully a large discount "box maker" does).

-- 
	      Stuart D. Gathman <stuart@bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Charles Marcus]

On 4/28/2008, Georges Giralt (georges.giralt@free.fr) wrote:
> The fisrt one,  small will be used for /boot
> The second one for everything else using LVM. 

Actually, I should have gone ahead and mention how I usually do it...

/boot (100MB)
/ (10GB - I know, but disks are cheap these days)
swap (1GB)
/tmp (1GB)

Then LVM for:

/home
/var

-- 

Best regards,

Charles

RE: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Karl Wagner]

At work, I'm stuck with the static partitions on the current servers, till I do a rebuild on new hardware at least ;)

My own home server uses 4xHDD with the same partition layout.
sdX1: MD RAID1, 1GB /boot
sdX2: MD RAID10, 5GB /
sdX3: MD RAID10, 20GB LVM for;
		/usr
		/var
sdX5: 50GB LVM for;
		/tmp (striped)
		Some exported AoE and iSCSI volumes
sdX6: rest of disk, MD RAID5, dm-crypt and LVM for data (including /home)

I know it's convoluted, but it works. I wish I had done dm-crypt on top of the LV's now rather than LVM on dm-crypt. It is not too slow, but I don't need encryption for everything on there and I can't do anything about it now (Think save up to replce them all with 1TB drives, now only �100 on Ebuyer :D )

-----Original Message-----
From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On Behalf Of Charles Marcus
Sent: 28 April 2008 19:36
To: LVM general discussion and development
Subject: Re: [linux-lvm] How to move /usr from LVM back to non-LVM?

On 4/28/2008, Georges Giralt (georges.giralt@free.fr) wrote:
> The fisrt one,  small will be used for /boot
> The second one for everything else using LVM. 

Actually, I should have gone ahead and mention how I usually do it...

/boot (100MB)
/ (10GB - I know, but disks are cheap these days)
swap (1GB)
/tmp (1GB)

Then LVM for:

/home
/var

-- 

Best regards,

Charles

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read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


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RE: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Georges Giralt]

Hi Karl,
If I may,
As you've 4 HDD here what I would do :
Get 2 for system files :
2 part on each of them
1) small 200 MB
2) the remaining.
Set up MD raid on the 2 first partition, use as /boot
Set un md raid partition of the 2 other, us as LVM onto which you put
 lv 1 /
 lv2 /tmp
 lv3 /usr
 lv4 /var
LV5 swap

Get the 2 remaining disks and set only one partition on them,
MD mirror the 2 partiton and set up a LVM on the md.
create lv as needed for /home, database storage area, whatever is needed.

If ons disk dies on you, you can use the remaing for the whole function during
repair time.
When the disk has been replaced, you've only to re-sync the md 's it was
supporting and "everithing's fine".
As LVM is concerned, the software mirror is transparent and goes unnoticed.
If the whole server crash, you can get the user data disks onto another server
and import the LVM to make the data availlable again. This may be planned by
exporting the LVM data in advance (if you've similar servers (same tools, but
maybe different application) )
Hope this helps.
Selon Karl Wagner <kwagner@zetex.com>:

> At work, I'm stuck with the static partitions on the current servers, till I
> do a rebuild on new hardware at least ;)
>
> My own home server uses 4xHDD with the same partition layout.
> sdX1: MD RAID1, 1GB /boot
> sdX2: MD RAID10, 5GB /
> sdX3: MD RAID10, 20GB LVM for;
> 		/usr
> 		/var
> sdX5: 50GB LVM for;
> 		/tmp (striped)
> 		Some exported AoE and iSCSI volumes
> sdX6: rest of disk, MD RAID5, dm-crypt and LVM for data (including /home)
>
> I know it's convoluted, but it works. I wish I had done dm-crypt on top of
> the LV's now rather than LVM on dm-crypt. It is not too slow, but I don't
> need encryption for everything on there and I can't do anything about it now
> (Think save up to replce them all with 1TB drives, now only �100 on Ebuyer :D
> )
>
> -----Original Message-----
> From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On
> Behalf Of Charles Marcus
> Sent: 28 April 2008 19:36
> To: LVM general discussion and development
> Subject: Re: [linux-lvm] How to move /usr from LVM back to non-LVM?
>
> On 4/28/2008, Georges Giralt (georges.giralt@free.fr) wrote:
> > The fisrt one,  small will be used for /boot
> > The second one for everything else using LVM.
>
> Actually, I should have gone ahead and mention how I usually do it...
>
> /boot (100MB)
> / (10GB - I know, but disks are cheap these days)
> swap (1GB)
> /tmp (1GB)
>
> Then LVM for:
>
> /home
> /var
>
> --
>
> Best regards,
>
> Charles
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>  This has been checked by www.blackspider.com
>
>
> _________________________________________________________
>
> Zetex Semiconductors - Solutions for an analog world.
>
> http://www.zetex.com
> http://www.zetex.cn
>
> E-MAILS are susceptible to interference.  You should not assume that
> the contents originated from the sender or the Zetex Group or that they
> have been accurately reproduced from their original form.
> Zetex accepts no responsibility for information, errors or omissions in
> this e-mail nor for its use or misuse nor for any act committed or
> omitted in connection with this communication.
> If in doubt, please verify the authenticity with the sender.
> _________________________________________________________
>
>
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>


-- 

RE: [linux-lvm] How to move /usr from LVM back to non-LVM?

[Karl Wagner]

Cheers, but this defeats one point of my server... I have a LOT of data.

Currently my data totals nearly 1TB. Some of this I will be removing (as I reorganise my music/videos etc) but that wont be much. So I have 2 choices... buy more HDDs (with no money... not happenning) or use RAID5 across all 4. Of course I am not considering a non-RAID for it coz theres no WAY I am loosing 1TB of data, after spending weeks ripping all my CDs & DVDs, building custom media database, etc...

Karl

-----Original Message-----
From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On Behalf Of Georges Giralt
Sent: 29 April 2008 10:39
To: LVM general discussion and development
Subject: RE: [linux-lvm] How to move /usr from LVM back to non-LVM?

Hi Karl,
If I may,
As you've 4 HDD here what I would do :
Get 2 for system files :
2 part on each of them
1) small 200 MB
2) the remaining.
Set up MD raid on the 2 first partition, use as /boot
Set un md raid partition of the 2 other, us as LVM onto which you put
 lv 1 /
 lv2 /tmp
 lv3 /usr
 lv4 /var
LV5 swap

Get the 2 remaining disks and set only one partition on them,
MD mirror the 2 partiton and set up a LVM on the md.
create lv as needed for /home, database storage area, whatever is needed.

If ons disk dies on you, you can use the remaing for the whole function during
repair time.
When the disk has been replaced, you've only to re-sync the md 's it was
supporting and "everithing's fine".
As LVM is concerned, the software mirror is transparent and goes unnoticed.
If the whole server crash, you can get the user data disks onto another server
and import the LVM to make the data availlable again. This may be planned by
exporting the LVM data in advance (if you've similar servers (same tools, but
maybe different application) )
Hope this helps.
Selon Karl Wagner <kwagner@zetex.com>:

> At work, I'm stuck with the static partitions on the current servers, till I
> do a rebuild on new hardware at least ;)
>
> My own home server uses 4xHDD with the same partition layout.
> sdX1: MD RAID1, 1GB /boot
> sdX2: MD RAID10, 5GB /
> sdX3: MD RAID10, 20GB LVM for;
> 		/usr
> 		/var
> sdX5: 50GB LVM for;
> 		/tmp (striped)
> 		Some exported AoE and iSCSI volumes
> sdX6: rest of disk, MD RAID5, dm-crypt and LVM for data (including /home)
>
> I know it's convoluted, but it works. I wish I had done dm-crypt on top of
> the LV's now rather than LVM on dm-crypt. It is not too slow, but I don't
> need encryption for everything on there and I can't do anything about it now
> (Think save up to replce them all with 1TB drives, now only �100 on Ebuyer :D
> )
>
> -----Original Message-----
> From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On
> Behalf Of Charles Marcus
> Sent: 28 April 2008 19:36
> To: LVM general discussion and development
> Subject: Re: [linux-lvm] How to move /usr from LVM back to non-LVM?
>
> On 4/28/2008, Georges Giralt (georges.giralt@free.fr) wrote:
> > The fisrt one,  small will be used for /boot
> > The second one for everything else using LVM.
>
> Actually, I should have gone ahead and mention how I usually do it...
>
> /boot (100MB)
> / (10GB - I know, but disks are cheap these days)
> swap (1GB)
> /tmp (1GB)
>
> Then LVM for:
>
> /home
> /var
>
> --
>
> Best regards,
>
> Charles
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>  This has been checked by www.blackspider.com
>
>
> _________________________________________________________
>
> Zetex Semiconductors - Solutions for an analog world.
>
> http://www.zetex.com
> http://www.zetex.cn
>
> E-MAILS are susceptible to interference.  You should not assume that
> the contents originated from the sender or the Zetex Group or that they
> have been accurately reproduced from their original form.
> Zetex accepts no responsibility for information, errors or omissions in
> this e-mail nor for its use or misuse nor for any act committed or
> omitted in connection with this communication.
> If in doubt, please verify the authenticity with the sender.
> _________________________________________________________
>
>
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>


-- 

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