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@strugglers.net> wrote:
Hi tariq,
I believe that will also reduce the LV *to* 100G. You want:
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
> )
# lvreduce -n data -L-100G
if you want to reduce it *by* 100G.
Nothing like FS/LV shrinking to keep you on your toes..
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Tariq Wali.
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