* Re: [gentoo-user] LVM: extending volume groups and logical volumes
@ 2011-12-16 7:41 99% ` J. Roeleveld
0 siblings, 0 replies; 1+ results
From: J. Roeleveld @ 2011-12-16 7:41 UTC (permalink / raw
To: gentoo-user
On Friday 16 December 2011 03:18:16 Allan Gottlieb wrote:
> I need to add space to /var (thank you, libreoffice), which is on lvm.
> Since my one volume group vg is getting low, I thought this would be a
> good time to extend it as well.
Actually, you need space in /var/tmp/portage
> Alan (McKinnon) has posted very helpful lvm bits (reprinted below).
> Following alan's bottom up creation mandate I believe the idea is
>
> phy disk: /dev/sda my only drive
> phy part: fdisk create another partition of type LVM (/dev/sda8)
> phy vol: pvcreate /dev/sda8
> vol grp: vgextend vg /dev/sda8
> log vol: lvextend --size +10G /dev/vg/var
> file sys: resize2fs /dev/vg/var
> files/dirs: not relevant
>
> Questions
>
> 1. Apparently 2.6 (hence 3.x) kernels can expand mounted file systems
> (/var is mounted as ext3).
>
> Since I can't unmount /var because it is in use, I guess that, if I
> every need to shrink /var, I would need to boot off a CD. Is that
> correct?
For shrinking, you need to umount the partition first. Online-resizing only
works when increasing the size.
> Back in the day, we had single user mode for this, but I don't see
> how to get the equivalent now.
"rc single" (See Dales email)
> Is it really safe to extend /var (i.e., /dev/vg/var) while mounted
> as ext3? It sounds frightening since daemons could start running
> and access /var.
Yes, I regularly extend filesystems while already copying data to them.
> 2. Since currently /var is entirely from /dev/sda7 (my original lvm
> partition) should I use the optional parameter to lvextend to
> force the new space for /var to come from there as well?
> lv extend --size +10G /dev/sda7
No, LVM can assign space from any disk. It will know where to go when
accessing it.
If it's just temporary for LibreOffice, I'd suggest making a temporary LV, mount
it at /var/tmp/portage and then emerging the software.
Then when finished, umount and remove the LV.
I see no need to have /var really large for normal use and have never tried
shrinking filesystems myself.
> thanks in advance
Your welcome :)
HTH,
--
Joost
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2011-12-16 2:18 [gentoo-user] LVM: extending volume groups and logical volumes Allan Gottlieb
2011-12-16 7:41 99% ` J. Roeleveld
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