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jaredready
Asked: 2014-01-25 06:29:16 +0800 CST

Breaking off /tmp using LVM

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I've recently been put in charge of a RHEL6 server running our NMS. I don't know much about Linux filesystem administration. What I'm needing to do is create a partition for /tmp, instead of having it sit on /. We are using LVM to handle our partitions.

#Output of df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             4.0G  1.1G  2.7G  29% /
tmpfs                  16G  116K   16G   1% /dev/shm
/dev/sda1             504M   61M  419M  13% /boot
/dev/mapper/VolGroup00-LVusr
                      4.0G  2.8G 1003M  74% /usr
/dev/mapper/VolGroup00-LVvar
                      9.9G  4.5G  4.9G  48% /var
/dev/mapper/VolGroup00-LVopt
                      252G   11G  229G   5% /opt

#Output of cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on <REDACTED>
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=d13d3a55-39c4-4be8-81b3-3181440961ca /                       ext4    defaults        1 1
UUID=d032e7b7-f44e-499f-94e1-58064385108f /boot                   ext4    defaults        1 2
/dev/mapper/VolGroup00-LVusr /usr                    ext4    defaults        1 2
/dev/VolGroup00/LVvar           /var            ext4    defaults        1 2
/dev/mapper/VolGroup00-LVopt /opt                    ext4    defaults        1 2
/dev/mapper/VolGroup00-LVswap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
#<REDACTED>:/volumes/nxpool-01/unix-home/home /home  nfs     defaults,rsize=8192,wsize=8192,intr,vers=3     0 0

This server has 1TB of RAID5 storage, so space isn't an issue. We have ample unallocated space to hand out, I just don't know how to create the partition using LVM. I started to run into issues of automated backups using /tmp and running out of space, so backups started to fail.

Please let me know if I'm leaving out any vital information.

lvm

1 Answers

  1. Per advice given, I asked my colleague who knows more than I.

    The general outline of what needed to happen:

    • vgdisplay to see Volume groups
    • lvcreate -L <size> -n <name> <volgroup> to create a new logical volume
    • mke2f -t <fstype> <path/to/volgroup/<name>> to create a filesystem out on the logical volume
    • vim /etc/fstab and add a new entry
    • mount the new partition
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