[linux-lvm] lvreduce nightmare
tariq wali
ganaiwali at gmail.com
Sun May 20 08:59:56 UTC 2012
Hi Andy,
Thanks for the mail.
I am not sure if reducing by lvreduce alone is safe and will actually
reduce the underneath file system also, look at this sequence ..
lvcreate -n test -L10G vg0
df -h /test/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg0-test 9.9G 151M 9.2G 2% /test
created some pseudo 2GB files with dd and /test now is
df -h
Filesystem Size Used *Avail* Use% Mounted on
/dev/mapper/vg0-test 9.9G 2.2G *7.2G* 24% /test
lvreduce -L -1G -n /dev/vg0/test
lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
test vg0 -wi-a- 9.00G
mount /dev/vg0/test /test/
df -h
Filesystem Size Used *Avail* Use% Mounted on
/dev/mapper/vg0-test 9.9G 2.2G *7.2G* 24% /test
you see after lvreduce 1G and mount /test again , it still shows */test as
7.2G* while as it should be *6.2G*
Tariq
On Sun, May 20, 2012 at 4:44 AM, Andy Smith <andy at strugglers.net> wrote:
> Hi tariq,
>
> On Fri, May 18, 2012 at 07:43:40PM +0530, tariq wali wrote:
> > so to i guess to do this right i should have
> >
> > resize2fs /dev/vg0/data 1.6T or (1600G)
> >
> > and then lvreduce -n data -L 100G /dev/vg0/data ( to reduce the lvm by
> 100
> > )
>
> I believe that will also reduce the LV *to* 100G. You want:
>
> # lvreduce -n data -L-100G
>
> if you want to reduce it *by* 100G.
>
> Nothing like FS/LV shrinking to keep you on your toes..
>
> Cheers,
> Andy
>
> --
> http://bitfolk.com/ -- No-nonsense VPS hosting
>
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>
--
*Tariq Wali.*
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