> -----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 ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.