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Re: LVM resize sanity check



On Wed, 2008-10-22 at 09:09 -0700, Craig White wrote:
> On Wed, 2008-10-22 at 11:42 -0400, brian wrote:
> > I have a /tmp volume that I'd like to increase. I've been having a look 
> > at the LVM HOWTO [1] and various other pages online and think I've got 
> > it figured out. Those being famous last words, I thought I'd check here 
> > first.
> > 
> > # parted /dev/sda print
> > Model: ATA Maxtor 6Y080L0 (scsi)
> > Disk /dev/sda: 82.0GB
> > Sector size (logical/physical): 512B/512B
> > Partition Table: msdos
> > 
> > Number  Start   End     Size    Type     File system  Flags
> >   1      32.3kB  107MB   107MB   primary  ext3         boot
> >   2      107MB   82.0GB  81.8GB  primary               lvm
> > 
> > # df -h
> > Filesystem            Size  Used Avail Use% Mounted on
> > /dev/mapper/VolGroup00-LogVol00
> >                         19G  4.5G   14G  26% /
> > /dev/mapper/VolGroup00-LogVol02
> >                         24G  8.5G   14G  38% /home
> > /dev/sda1              99M   19M   76M  20% /boot
> > tmpfs                 744M     0  744M   0% /dev/shm
> > /dev/mapper/VolGroup00-LogVol05
> >                        4.8G  540M  4.0G  12% /usr/local
> > /dev/mapper/VolGroup00-LogVol04
> >                         19G  6.3G   12G  35% /var
> > /dev/mapper/VolGroup00-LogVol03
> >                        961M   18M  894M   2% /tmp
> > /dev/mapper/VolGroup00-LogVol06
> >                        3.8G  194M  3.4G   6% /opt
> > 
> > 
> > I'd like to reduce /var first to free up some space, then give that to 
> > /tmp using:
> > 
> > # umount /var
> > # e2fsck -f /dev/VolGroup00/LogVol04
> > # resize2fs /dev/VolGroup00/LogVol04 13G
> > # lvreduce -L-6G /dev/VolGroup00/LogVol04
> > # mount /var
> > # umount /tmp
> > # e2fsck -f /dev/VolGroup00/LogVol03
> > # lvextend -L+6G /dev/VolGroup00/LogVol03
> > # resize2fs /dev/VolGroup00/LogVol03
> > # mount /tmp
> > 
> > Does that ring any alarm bells?
> > 
> > [1] http://www.tldp.org/HOWTO/LVM-HOWTO/
> ----
> I don't know about alarm bells but I would think that you would have to 'lvmove' LogVol04 to make contiguous space for LogVol03
> 
> frequent usage of things like lvdisplay can give you some good clues on
> where things are

That was supposed to be the point of LVM.  No moving necessary.  They
are both on the Volume Group, space doesn't have to be contiguous, etc,
etc....

I would suggest that when reducing you should use the "same numbers" for
both resize2fs and lvreduce.  Don't use an absolute number for one and a
relative number for the other.

As an alternative, that might be easier, why not install
"system-config-lvm"?  It presents a graphical view of shrinking and
enlarging.....

--Rob



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