Basic checks

  • Check if your nodes are all reachable by IP address as well as by hostname
  • Check if your network has the right throughput
  • Check if your disks are all working and do not report errors
  • Check your Chunkservers for:
    • Broken Disks
    • Slow Disks
    • permissions on your directories (the user which is running the chunkserver must be the owner of the directories)
    • network performance to other chunkserver
    • network performance to master server
    • network performance to clients
  • Check your license files for the correct name and location
  • Check your log files for errors. LizardFS is very talkative and reports a lot.

Check the speed of your network interface

Verifying what your network interface is set to is pretty simple on Linux, you can just use the ethtool program to tell you what your interface is actually set to:

ethtool <interface>


# ethtool eth0
  Settings for eth0:
      Supported ports: [ TP ]
      Supported link modes:   10baseT/Half 10baseT/Full
                              100baseT/Half 100baseT/Full
      Supported pause frame use: No
      Supports auto-negotiation: Yes
      Advertised link modes:  10baseT/Half 10baseT/Full
                              100baseT/Half 100baseT/Full
      Advertised pause frame use: No
      Advertised auto-negotiation: Yes
      Speed: 100Mb/s
      Duplex: Full
      Port: Twisted Pair
      PHYAD: 1
      Transceiver: internal
      Auto-negotiation: on
      MDI-X: on (auto)
      Supports Wake-on: pumbg
      Wake-on: g
      Current message level: 0x00000007 (7)
                             drv probe link
      Link detected: yes

As you can see, the interface reports a speed of 100Mb/s. It has Auto-negotiation enabled so is most probably connected to a 100Mb/s switch port.

Checking the throughput of your network

The best tool to verify if your network throughput is according to what you think it is would be the iperf tool. iperf allows you to verify the throughput between two machines. It is available for Linux, Windows, MacOS, FreeBSD and all other POSIX compliant systems and also most mobile phone OSes and is very easy to use.

For more information about iperf, please check out .