[CentOS] Re: LVM Resizing Problem
Ross S. W. Walker
rwalker at medallion.com
Sun May 6 15:14:50 UTC 2007
> -----Original Message-----
> From: centos-bounces at centos.org
> [mailto:centos-bounces at centos.org] On Behalf Of Scott Silva
> Sent: Friday, May 04, 2007 1:16 PM
> To: centos at centos.org
> Subject: [CentOS] Re: LVM Resizing Problem
>
> Al Sparks spake the following on 5/2/2007 6:59 PM:
> > I'm new to lvm. I decided to decrease the space of a
> logical volume.
> > So I did a:
> > $ df -m
> > Filesystem 1M-blocks Used Available Use%
> Mounted on
> > /dev/mapper/VolGroup00-LogVol00
> > 1953 251 1602 14% /
> > /dev/sda2 494 21 448 5% /boot
> > tmpfs 1014 0 1014 0% /dev/shm
> > /dev/mapper/VolGroup00-LogVol05
> > 48481 6685 39295 15% /home
> > /dev/mapper/VolGroup00-LogVol03
> > 961 18 894 2% /tmp
> > /dev/mapper/VolGroup00-LogVol01
> > 7781 2051 5329 28% /usr
> > /dev/mapper/VolGroup00-LogVol02
> > 5239 327 4642 7% /var
> >
> >
> >
> > $ sudo lvm lvreduce -L -1000M /dev/VolGroup00/LogVol05
> > Rounding up size to full physical extent 992.00 MB
> > WARNING: Reducing active and open logical volume to 47.91 GB
> > THIS MAY DESTROY YOUR DATA (filesystem etc.)
> > Do you really want to reduce LogVol05? [y/n]: y
> > Reducing logical volume LogVol05 to 47.91 GB
> > Logical volume LogVol05 successfully resized
> LVM even warned you --IN CAPS-- "THIS MAY DESTROY YOUR DATA".
> I guess it was right. I haven't had much luck with reducing a
> volume below its
> initial size. I usually make a new LV and rsync or cp -a the
> data over to it.
> I try to leave some free space just for this. Or add a drive
> temporarily.
Were the LV calculations done in the VG's extent size unit?
Most people forget LVM rounds to the closest whole extent in it's
calculations which I believe is 4MB by default, so care must be
taken to make sure any file system fits comfortably in there
first.
-Ross
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