Originally Posted by
wallie356
I currently have the OS installed on the 146GB drive and I used Guided LVM to partition the disk. When asked, I used 19 GB for the guided partitioning but I now get an error when installing more software because the root directory is 100% full. I'm guessing that I can increase the 19GB but just don't know how.
I haven't used LVM in a very long time. Was there any free space set aside? You could join some or all of it with the partition that is full.
How do I put the big drive on /home after I've already finished the OS and other program installs?
It sounds like you might want to divide the big array into a couple of partitions, one for /home and one for /var/lib/mysql where the database will reside. You would need to divide each disk identically, then use mdadm to create two separate RAID arrays, let's say /dev/md0 and /dev/md1. Format each of them as ext4 like this:
Code:
sudo fsck -t ext4 /dev/md0
sudo fsck -t ext4 /dev/md1
How much space you choose to allocate to the two partitions is up to you.
Now you need to mount these devices temporarily so you can transfer some files.
Code:
sudo mkdir /mnt/d0
sudo mkdir /mnt/d1
sudo mount /dev/md0 /mnt/d0
sudo mount /dev/md1 /mnt/d1
Now let's transfer the contents of /home to md0 and of /var/lib/mysql to md1.
Code:
cd /home
sudo rsync -av . /mnt/d0
# just in case
sudo service mysql stop
cd /var/lib/mysql
sudo rsync -av . /mnt/d1
Now the two RAID drives will mirror the contents of /home and /var/lib/mysql. Now we just have to mount them. First, let's move the old /home out of the way, then mount /dev/md0 as /home.
Code:
cd /
sudo mv home home.old
sudo mkdir home
sudo chown root:root home
sudo chmod 0755 home
# unmount /dev/md0 from its temporary location
sudo umount /mnt/d0
# mount /dev/md0 as /home
sudo mount /dev/md0 /home
and the same for /var/lib/mysql
Code:
cd /var/llib
sudo mv mysql mysql.old
sudo mkdir mysql
sudo chown mysql:mysql mysql
sudo chmod 0700 mysql
sudo umount /mnt/d1
sudo mount /dev/md1 /var/lib/mysql
Finally make sure the contents of your home directory is still available with "ls -a ~". Then make sure MySQL starts up by running "sudo service mysql start".
Notice that /var/lib/mysql is owned by user and group mysql with no file permissions granted to any other user.
You'll want to add entries to /etc/fstab to mount these devices automatically at boot.
Another, somewhat less complicated method is to use "symbolic links" or "symlinks." This time, I'll assume you've created just one large partition on each of the array drives, then created a single MD device called /dev/md0 that you have mounted at /media/storage.
Now you can do this:
Code:
cd /
sudo rsync -av home /media/storage
cd /var/lib
sudo rsync -av mysql /media/storage
Now there will be two directories on the array, /media/storage/home and /media/storage/mysql. Now let's link to them to replace the existing directories:
Code:
cd /
sudo mv home home.old
sudo ln -s /media/storage/home
cd /var/lib
sudo mv mysql mysql.old
sudo ln -s /media/storage/mysql
If you now type "ls /" you'll see that home is a pointer to /media/storage/home; an "ls /var/lib" should produce similar results. Now references to /home will use /media/storage/home and similarly for /var/lib/mysql. This might be an easier and more flexible method than mounting fixed partitions.
Once you're sure everything is running correctly, you can delete those home.old and mysql.old directories.
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