how to reduce or logical volume of ext3 filesystem in rhel3es

shellarchive · 07-02-2007, 02:24 AM

how to reduce or logical volume of ext3 filesystem in rhel3es

do we have to resize it before using lvreduce -L500 /dev/vgo/lv1.

how to use resize2fs command.
and how to know block size.

lvm howto describe the procedure as

umount /dev/vgo/lv1
resize2fs /dev/vg0/lv1 524288
mount /dev/vg0/lv1 /mnt/new

if yes then how to know the block size 524288.

please help.

WhatsHisName · 07-02-2007, 05:48 PM

Don’t know how well this lvm2 advice will work in lvm1, but ...

Say you want to reduce a logical volume from 10GB to 7.5GB and you are fairly sure that you have enough space to do it. Starting with an unmounted logical volume, you could:

Code:

# e2fsck -f dev/vg0/lv1

# resize2fs dev/vg0/lv1 7500M

# lvresize -L7.5G dev/vg0/lv1

# resize2fs dev/vg0/lv1

Once the filesystem size has been reduced followed by reducing the logical volume size, you then grow the filesystem to the full available space.

The use of rounded MB instead of GB in resize2fs is an easy way to give yourself a 2% buffer zone (i.e., the interim filesystem will be slightly smaller than the target logical volume size), remembering that 7.5GB would be 7680MB.

WhatsHisName · 07-02-2007, 05:57 PM

Forgot to mention...

It’s always a good idea to do a backup before resizing a logical volume, or before doing any filesystem manipulation.

shellarchive · 07-02-2007, 11:36 PM

thanx it worked.
And sorry it was LVM2 on Rhel4 AS.

Quote:

Originally Posted by WhatsHisName

Forgot to mention...

It’s always a good idea to do a backup before resizing a logical volume, or before doing any filesystem manipulation.