Re: LVM resize sanity check

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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

Craig

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