Re: [CentOS] resize lvm

2016-05-07 Thread Wes James 
On Sat, May 7, 2016 at 7:57 AM, Robert Nichols 
wrote:

> On 05/06/2016 02:15 PM, Wes James wrote:
>
>> I found this:
>>
>> # lvextend -l +100%FREE /dev/myvg/testlv
>>
>> doing a search.  What's the difference between 100%VG and 100%FREE?
>>
>
> For the special case of "100%" there is no difference. For values
> less than 100% with a non-empty VG, the two are quite different,
> e.g., (50% of VG) != (50% of the free space in VG).
>

Thanks.  This is the first time I'm worked with the lvm commands.  I
thought VG was a typo for GB, but I see in the help commands for lvm:
lvdisplay and vgdisplay - vg is volume group.

-wes
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Re: [CentOS] resize lvm

2016-05-07 Thread Robert Nichols 

On 05/06/2016 02:15 PM, Wes James wrote:

I found this:

# lvextend -l +100%FREE /dev/myvg/testlv

doing a search.  What's the difference between 100%VG and 100%FREE?


For the special case of "100%" there is no difference. For values
less than 100% with a non-empty VG, the two are quite different,
e.g., (50% of VG) != (50% of the free space in VG).

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Re: [CentOS] resize lvm

2016-05-07 Thread Robert Nichols 

On 05/06/2016 01:42 PM, John R Pierce wrote:

On 5/6/2016 11:39 AM, Wes James wrote:

file -s /dev/dm-0



and it says XFS



So would I use xfs_growfs?


bingo!xfs_growfs can be used with the file system online, I'm pretty
sure resize2fs requires the file system to be offline (unmounted).


Online expansion of a filesystem is allowed by resize2fs. It is only for 
shrinking that being offline and running fsck is required.


xfs does not allow shrinking at all.

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Re: [CentOS] resize lvm

2016-05-06 Thread Wes James 
>
> From: Scott Robbins <scottr...@gmail.com>
> Date: May 06, 2016 12:32:55 PM
> To: CentOS mailing list <centos@centos.org>
> Subject: Re: [CentOS] resize lvm
>
> On Fri, May 06, 2016 at 06:19:35PM +, Wes James wrote:
>
> I have a laptop that I put centos 7 on and I started out with a 30gig
partition.  I resized the other part of the disk to allow more space for
centos.  I then created an unformated partition in the available space,  ran
>
>
>
> pvcreate /dev/sda4
>
>
>
>
> vgextend lvname /dev/sda4
>
>
>
>
> lvextend -L 184.46G /dev/lvname/root
>
>
>
> I find it easiest to do lvextend -l 100%VG /dev/lvname/rootI find it
> easiest to do lvextend -l 100%VG /dev/lvname/root.
> (Then, if practical, and since it's a laptop, I'm guessing it's not a
> production machine), reboot from a livecd or whatever and doing e2fsk -f
> /dev/lvmname/root
>
> I don't know if it will solve your issue, but may be worth trying.



I found this:

# lvextend -l +100%FREE /dev/myvg/testlv

doing a search.  What's the difference between 100%VG and 100%FREE?

Thanks,

-wes
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Re: [CentOS] resize lvm

2016-05-06 Thread Scott Robbins 
On Fri, May 06, 2016 at 11:42:18AM -0700, John R Pierce wrote:
> On 5/6/2016 11:39 AM, Wes James wrote:
> >file -s /dev/dm-0
> >
> >
> >
> >and it says XFS
> >
> >
> >
> >So would I use xfs_growfs?
> 
> bingo!xfs_growfs can be used with the file system online, I'm
> pretty sure resize2fs requires the file system to be offline
> (unmounted).

Sorry, I missed that it would most likely be xfs.  resize2fs doesn't
necessarily require it to be offline, but it does frequently (though not
always, IIRC), suggest running e2fsk first which should definitely be done
while it's unmounted.

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Re: [CentOS] resize lvm

2016-05-06 Thread Wes James 




On May 06, 2016, at 12:37 PM, John R Pierce  wrote:


On 5/6/2016 11:28 AM, John R Pierce wrote:

On 5/6/2016 11:19 AM, Wes James wrote:
sudo resize2fs /dev/lvname/root




I get:






resize2fs: Bad magic number in super-block while trying to open
/dev/lvname/root
Couldn't find valid filesystem superblock.




what file system type is this /dev/lvname/root ?

oops, left out the rest...

since you said C7, its quite likely its XFS not extXfs ... if thats the
case, then use:

xfs_growfs /dev/lvname/root





Thanks for the tip.  I looked at man xfs_growfs and found -d option and so I 
used this and it worked:


sudo xfs_growfs / -d






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Thanks!


-wes
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Re: [CentOS] resize lvm

2016-05-06 Thread James A. Peltier 


- Original Message -
| On Fri, May 06, 2016 at 06:19:35PM +, Wes James wrote:
| > I have a laptop that I put centos 7 on and I started out with a 30gig
| > partition.  I resized the other part of the disk to allow more space for
| > centos.  I then created an unformated partition in the available space,
| >   ran
| > 
| > 
| > pvcreate /dev/sda4
| > 
| > 
| > 
| > vgextend lvname /dev/sda4
| > 
| > 
| > 
| > lvextend -L 184.46G /dev/lvname/root
| 
| 
| I find it easiest to do lvextend -l 100%VG /dev/lvname/rootI find it
| easiest to do lvextend -l 100%VG /dev/lvname/root.
| (Then, if practical, and since it's a laptop, I'm guessing it's not a
| production machine), reboot from a livecd or whatever and doing e2fsk -f
| /dev/lvmname/root
| 
| I don't know if it will solve your issue, but may be worth trying.
| 
| > 
| > 
| > but when I run:
| > 
| > 
| > 
| > sudo resize2fs /dev/lvname/root
| > 
| > 
| > I get:
| > 
| > 
| > 
| > resize2fs: Bad magic number in super-block while trying to open
| > /dev/lvname/root
| > Couldn't find valid filesystem superblock.
| > 
| 
| --
| Scott Robbins
| PGP keyID EB3467D6
| ( 1B48 077D 66F6 9DB0 FDC2 A409 FA54 EB34 67D6 )
| gpg --keyserver pgp.mit.edu --recv-keys EB3467D6

if you use pass the '-r' option to lvextend it will resize the volume for you 
based on the filesystem that is on the volume.  no need to grow it manually 
afterward.


-- 
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IT Services - Research Computing Group
Simon Fraser University - Burnaby Campus
Phone   : 604-365-6432
Fax : 778-782-3045
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Re: [CentOS] resize lvm

2016-05-06 Thread John R Pierce 

On 5/6/2016 11:39 AM, Wes James wrote:

file -s /dev/dm-0



and it says XFS



So would I use xfs_growfs?


bingo!xfs_growfs can be used with the file system online, I'm pretty 
sure resize2fs requires the file system to be offline (unmounted).





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Re: [CentOS] resize lvm

2016-05-06 Thread Wes James 




On May 06, 2016, at 12:29 PM, John R Pierce  wrote:


On 5/6/2016 11:19 AM, Wes James wrote:

sudo resize2fs /dev/lvname/root




I get:






resize2fs: Bad magic number in super-block while trying to open
/dev/lvname/root
Couldn't find valid filesystem superblock.


what file system type is this /dev/lvname/root ?



I tried to find the type from blkid /dev/sda4 but that didn't give me the info 
so I tried



file -s /dev/dm-0



and it says XFS



So would I use xfs_growfs?

 


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Re: [CentOS] resize lvm

2016-05-06 Thread John R Pierce 

On 5/6/2016 11:28 AM, John R Pierce wrote:

On 5/6/2016 11:19 AM, Wes James wrote:

sudo resize2fs /dev/lvname/root


I get:



resize2fs: Bad magic number in super-block while trying to open 
/dev/lvname/root

Couldn't find valid filesystem superblock.



what file system type is this /dev/lvname/root  ?


oops, left out the rest...

since you said C7, its quite likely its XFS not extXfs ...  if thats the 
case, then use:


xfs_growfs /dev/lvname/root



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Re: [CentOS] resize lvm

2016-05-06 Thread Scott Robbins 
On Fri, May 06, 2016 at 06:19:35PM +, Wes James wrote:
> I have a laptop that I put centos 7 on and I started out with a 30gig 
> partition.  I resized the other part of the disk to allow more space for 
> centos.  I then created an unformated partition in the available space,  ran
> 
> 
> pvcreate /dev/sda4
> 
> 
> 
> vgextend lvname /dev/sda4
> 
> 
> 
> lvextend -L 184.46G /dev/lvname/root


I find it easiest to do lvextend -l 100%VG /dev/lvname/rootI find it
easiest to do lvextend -l 100%VG /dev/lvname/root.  
(Then, if practical, and since it's a laptop, I'm guessing it's not a
production machine), reboot from a livecd or whatever and doing e2fsk -f
/dev/lvmname/root

I don't know if it will solve your issue, but may be worth trying. 

> 
> 
> but when I run:
> 
> 
> 
> sudo resize2fs /dev/lvname/root
> 
> 
> I get:
> 
> 
> 
> resize2fs: Bad magic number in super-block while trying to open 
> /dev/lvname/root
> Couldn't find valid filesystem superblock.
> 

-- 
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Re: [CentOS] resize lvm

2016-05-06 Thread John R Pierce 

On 5/6/2016 11:19 AM, Wes James wrote:

sudo resize2fs /dev/lvname/root


I get:



resize2fs: Bad magic number in super-block while trying to open 
/dev/lvname/root

Couldn't find valid filesystem superblock.



what file system type is this /dev/lvname/root  ?



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[CentOS] resize lvm

2016-05-06 Thread Wes James 

I have a laptop that I put centos 7 on and I started out with a 30gig 
partition.  I resized the other part of the disk to allow more space for 
centos.  I then created an unformated partition in the available space,  ran


pvcreate /dev/sda4



vgextend lvname /dev/sda4



lvextend -L 184.46G /dev/lvname/root


but when I run:



sudo resize2fs /dev/lvname/root


I get:



resize2fs: Bad magic number in super-block while trying to open /dev/lvname/root
Couldn't find valid filesystem superblock.


How do I resize the volume?



Thanks,



-wes
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Re: [CentOS] resize LVM (ext3)

2008-10-31 Thread David Hláčik 
Thanks guys for help!

Work is done, everything went fine ..

Have a nice day,

D.

On Wed, Oct 29, 2008 at 3:24 PM, William L. Maltby
[EMAIL PROTECTED] wrote:

 On Wed, 2008-10-29 at 10:15 -0400, Filipe Brandenburger wrote:
 snip

 Reduce the filesystem to 78G or 79G with resize2fs, then reduce the LV
 to 80G, then grow the ext3 filesystem again to fill all the LV. This
 should make it safer when cutting the LV.

 That's what I always do. It eliminates small chances of my math
 disagreeing with resize2fs's math. Plus, IIRC, then the second re-size
 doesn't need a size parameter. Resize2fs will automatically grow to the
 maximum allowed by the partition/logvol.


 HTH,
 Filipe
 snip sig stuff

 HTH
 --
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[CentOS] resize LVM (ext3)

2008-10-29 Thread David Hláčik 
Hello guys,

my scenario is following


   1. I have LVM group named system
   2. I have a logical volumes
  - system/root , ext3 mounted as / (20GB)
  - system/swap, swap
  - system/home, ext3 mounted as /home (431GB)

I need to shrink system/home to 80GB (currently there is 57GB used) and use
free space to create another logical volumes.

My scenario is


   1. reduce ext3 fs size to 80GB by using resize2s
   2. reduce system/home size by using lvreduce
   3. create another logical volumes

Questions


   1. How can i be sure that i will shrink ext3 to exact size 80GB and that
   the same will lvreduce do? I do not want to cut from ext3 filesystem if i
   will reduce logical volume too much
   2. Can you please send me commands to achieve 1) and 2) part of my
   scenario?
   3. Or can i just use lvreduce and my ext3 will shrink automatically?
   4. Do i need to umount system/home when resizing?

Thanks in advance!

David
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Re: [CentOS] resize LVM (ext3)

2008-10-29 Thread Luciano Rocha 
On Wed, Oct 29, 2008 at 12:58:32PM +0100, David Hláčik wrote:
snip
1. How can i be sure that i will shrink ext3 to exact size 80GB and that

dev=/dev/system/home
resize2fs $dev 80G

Then, to be sure of the real size:
blks=$(tune2fs -l $dev | awk -F: '/Block size/ { print $2/512 }')
fssize=$(tune2fs -l $dev |
  awk -v bs=$blks -F: '/Block count/{print $2*bs}')

Now, $fssize has the complete size in bytes. Verify it:
echo $fssize

Now, for lvresize:
lvresize -L 80G system/home

Verify that the printed target size matches the wanted value.

3. Or can i just use lvreduce and my ext3 will shrink automatically?

NO! lvreduce doesn't care about what's inside, and will happily lose
data.

4. Do i need to umount system/home when resizing?

Yes, and you must do a full fsck also:

e2fsck -f /dev/system/home

Regards,
Luciano Rocha

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Re: [CentOS] resize LVM (ext3)

2008-10-29 Thread David Hláčik 


 Now, for lvresize:
 lvresize -L 80G system/home

Are you sure there should not be lvreduce -L 80G system/home ?

Thanks!

D.
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Re: [CentOS] resize LVM (ext3)

2008-10-29 Thread Luciano Rocha 
On Wed, Oct 29, 2008 at 01:38:06PM +0100, David Hláčik wrote:
 
 
  Now, for lvresize:
  lvresize -L 80G system/home
 
 Are you sure there should not be lvreduce -L 80G system/home ?

Same thing. I prefer the direction-neutral lvresize.

Regards,
Luciano Rocha

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Re: [CentOS] resize LVM (ext3)

2008-10-29 Thread Filipe Brandenburger 
Hi,

On Wed, Oct 29, 2008 at 07:58, David Hláčik [EMAIL PROTECTED] wrote:
 How can i be sure that i will shrink ext3 to exact size 80GB and that the
 same will lvreduce do? I do not want to cut from ext3 filesystem if i will
 reduce logical volume too much

Reduce the filesystem to 78G or 79G with resize2fs, then reduce the LV
to 80G, then grow the ext3 filesystem again to fill all the LV. This
should make it safer when cutting the LV.

HTH,
Filipe
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Re: [CentOS] resize LVM (ext3)

2008-10-29 Thread William L. Maltby 

On Wed, 2008-10-29 at 10:15 -0400, Filipe Brandenburger wrote:
 snip

 Reduce the filesystem to 78G or 79G with resize2fs, then reduce the LV
 to 80G, then grow the ext3 filesystem again to fill all the LV. This
 should make it safer when cutting the LV.

That's what I always do. It eliminates small chances of my math
disagreeing with resize2fs's math. Plus, IIRC, then the second re-size
doesn't need a size parameter. Resize2fs will automatically grow to the
maximum allowed by the partition/logvol.

 
 HTH,
 Filipe
 snip sig stuff

HTH
-- 
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