Configuring Optional Features

LizardFS comes with a range of optional features whose configuration does not belong in the basic or advanced modes.

Configuring LTO handling

Installation

THe LizardFS tape server package can be installed via:

$ apt-get install lizardfs-tapeserver # Debian/Ubuntu
$ yum install lizardfs-tapeserver # CentOS/RedHat

Configuration

The configuration file for the lizardfs-tapeserver is located at /etc/mfs/lizardfs-tapeserver.cfg. The tape server needs a working mount point on your LizardFS installation. Configuration consists mainly of listing changer and volume devices of a tape library.

Example configuration:

[lizardfs-tapeserver]
# Name
name = tapesrv
# Master host network info
masterhost = 192.168.1.5
masterport = 9424
# Path to mountpoint used for file reading/writing
mountpoint = /mnt/tapemount
# Path to temporary cache for files
cachepath  = /tmp/cache
# Path to sqlite3 database
database = /opt/tape.db
# Changer devices
changers = /dev/sg3
# Drive devices
drives = /dev/st0,/dev/st1
# Volume ids
volumes = 000003,000180,000002
# Label
label = tapeserver1

Verifying your installation

Installation can be easily verified using the lizardfs-admin command:

$ lizardfs-admin list-tapeserver MASTER_ADDR MASTER_PORT

If the installation succeeded, the command above should result in listing all tape servers connected to the current master.

Verification if tape storage works properly can be achieved by the steps below:

  • create a test file

  • set tape goal to the file: mfssetgoal your_tape_goal testfile

  • wait for replication to take place, check its status with ‘mfsfileinfo’ command:

    $ mfsfileinfo testfile

  • Replication to tape is complete after tape copy status changes from Creating to Ok

  • verify that the file was actually stored on tape:

    $ tar tf /dev/your_tape_volume # will list all files present on tape
$ tar xvf /dev/your_tape_volume filename # will extract file ‘filename’ from tape

Configuring tape goals

Tape goals are configured just like regular goals, save one difference in naming. In order to create a tape goal, append a “@” sign to the end of its definition.

Example mfsgoals.cfg contents:

1 1 : _
2 2 : _ _
3 tape1 : _ _@
4 tape2: ssd _@ ts@
5 fast: ssd ssd _

The example above contains 2 tape goal definitions.

The first one (tape1), configures that there should be 2 copies of each chunk:

  • 1 on any chunkserver
  • 1 on any tape.

The second one (tape2) requires each chunk to have 3 copies:

  • 1 on chunkserver labeled “ssd”
  • 1 on any tape
  • 1 on tape labeled “ts”