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