A Beginner's Guide To LVM [3/9]

from: https://www.howtoforge.com/linux_lvm_p3
Until now we have three logical volumes, but we don't have any filesystems i
4000
n them, and without a filesystem we can't save anything in them. Therefore we create an ext3 filesystem in
share, an xfs filesystem in backup, and a reiserfs filesystem in
media:

mkfs.ext3 /dev/fileserver/share
server1:~# mkfs.ext3 /dev/fileserver/share

mke2fs 1.40-WIP (14-Nov-2006)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

5242880 inodes, 10485760 blocks

524288 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=0

320 block groups

32768 blocks per group, 32768 fragments per group

16384 inodes per group

Superblock backups stored on blocks:

        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,

        4096000, 7962624

Writing inode tables: done

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 23 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.
mkfs.xfs /dev/fileserver/backup
server1:~# mkfs.xfs /dev/fileserver/backup

meta-data=/dev/fileserver/backup isize=256    agcount=8, agsize=163840 blks

         =                       sectsz=512   attr=0

data     =                       bsize=4096   blocks=1310720, imaxpct=25

         =                       sunit=0      swidth=0 blks, unwritten=1

naming   =version 2              bsize=4096

log      =internal log           bsize=4096   blocks=2560, version=1

         =                       sectsz=512   sunit=0 blks

realtime =none                   extsz=65536  blocks=0, rtextents=0
mkfs.reiserfs /dev/fileserver/media
server1:~# mkfs.reiserfs /dev/fileserver/media

mkfs.reiserfs 3.6.19 (2003 www.namesys.com)

A pair of credits:

Alexander  Lyamin  keeps our hardware  running,  and was very  generous  to our

project in many little ways.

Chris Mason wrote the journaling code for V3,  which was enormously more useful

to users than just waiting until  we could create a wandering log filesystem as

Hans would have unwisely done without him.

Jeff Mahoney optimized the bitmap  scanning code for V3,  and performed the big

endian cleanups.

Guessing about desired format.. Kernel 2.6.17-2-486 is running.

Format 3.6 with standard journal

Count of blocks on the device: 262144

Number of blocks consumed by mkreiserfs formatting process: 8219

Blocksize: 4096

Hash function used to sort names: "r5"

Journal Size 8193 blocks (first block 18)

Journal Max transaction length 1024

inode generation number: 0

UUID: 2bebf750-6e05-47b2-99b6-916fa7ea5398

ATTENTION: YOU SHOULD REBOOT AFTER FDISK!

        ALL DATA WILL BE LOST ON '/dev/fileserver/media'!

Continue (y/n):y

Initializing journal - 0%....20%....40%....60%....80%....100%

Syncing..ok

Tell your friends to use a kernel based on 2.4.18 or later, and especially not a

kernel based on 2.4.9, when you use reiserFS. Have fun.

ReiserFS is successfully created on /dev/fileserver/media.
Now we are ready to mount our logical volumes. I want to mount
share in /var/share, backup in
/var/backup, and media in
/var/media, therefore we must create these directories first:

mkdir /var/media /var/backup /var/share
Now we can mount our logical volumes:

mount /dev/fileserver/share /var/share

mount /dev/fileserver/backup /var/backup

mount /dev/fileserver/media /var/media
Now run

df -h
You should see your logical volumes in the output:

server1:~# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/sda2              19G  665M   17G   4% /

tmpfs                  78M     0   78M   0% /lib/init/rw

udev                   10M   88K   10M   1% /dev

tmpfs                  78M     0   78M   0% /dev/shm

/dev/sda1             137M   17M  114M  13% /boot

/dev/mapper/fileserver-share

                       40G  177M   38G   1% /var/share

/dev/mapper/fileserver-backup

                      5.0G  144K  5.0G   1% /var/backup

/dev/mapper/fileserver-media

                      1.0G   33M  992M   4% /var/media

Congratulations, you've just set up your first LVM system! You can now write to and read from
/var/share, /var/backup, and
/var/media as usual.

We have mounted our logical volumes manually, but of course we'd like to have them mounted automatically when the system boots. Therefore we modify
/etc/fstab:

mv /etc/fstab /etc/fstab_orig

cat /dev/null > /etc/fstab
vi /etc/fstab
Put the following into it:

# /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc defaults 0 0 /dev/sda2 / ext3 defaults,errors=remount-ro 0 1 /dev/sda1 /boot ext3 defaults 0 2 /dev/hdc /media/cdrom0 udf,iso9660 user,noauto 0 0 /dev/fd0 /media/floppy0 auto rw,user,noauto 0 0 /dev/fileserver/share /var/share ext3 rw,noatime 0 0 /dev/fileserver/backup /var/backup xfs rw,noatime 0 0 /dev/fileserver/media /var/media reiserfs rw,noatime 0 0

If you compare it to our backup of the original file, /etc/fstab_orig, you will notice that we added the lines:

/dev/fileserver/share   /var/share     ext3       rw,noatime    0 0

/dev/fileserver/backup    /var/backup      xfs        rw,noatime    0 0

/dev/fileserver/media    /var/media      reiserfs   rw,noatime    0 0
Now we reboot the system:

shutdown -r now
After the system has come up again, run

df -h
again. It should still show our logical volumes in the output:

server1:~# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/sda2              19G  665M   17G   4% /

tmpfs                  78M     0   78M   0% /lib/init/rw

udev                   10M   88K   10M   1% /dev

tmpfs                  78M     0   78M   0% /dev/shm

/dev/sda1             137M   17M  114M  13% /boot

/dev/mapper/fileserver-share

                       40G  177M   38G   1% /var/share

/dev/mapper/fileserver-backup

                      5.0G  144K  5.0G   1% /var/backup

/dev/mapper/fileserver-media

                      1.0G   33M  992M   4% /var/media