How to do a quick Health Check on live Systems

Owned by Admin
Last updated: Jul 14, 2020
1 min read

This KB is geared to assist with doing a quick health Check on SoftNAS systems during meetings or assessments of overall system health

Specific Resources to check:

  • Memory
    • top <shift> <m> to sort by RAM
    • free -m
    • ps (look at VSZ and RSS values)
    • sar -r :- To Check Memory Usage
    • sar -S :- To check Swap Usage
  • CPU
    • top
    • sar -u : - Displays all CPU usage
    • uptime (look at load information)
  • IO Wait
    • iostat -x 1 (disk IO)
    • ioping -R /dev/xvdX
    • sar -b :-Overall I/O Activities
    • sar -w :- Content switch per sec
    • sar -q :- The “blocked” column displays the number of tasks that are currently blocked and waiting for I/O operation to complete.
    • sar -p -d :- Display the list of Block devices and their activity
    • iftop (look at overall network throughput)
    • sar -n DEV

  • KEYWORD can be one of the following:

    • DEV – Displays network devices vital statistics for eth0, eth1, etc.,
    • EDEV – Display network device failure statistics
    • NFS – Displays NFS client activities
    • NFSD – Displays NFS server activities
    • SOCK – Displays sockets in use for IPv4
    • IP – Displays IPv4 network traffic
    • EIP – Displays IPv4 network errors
    • ICMP – Displays ICMPv4 network traffic
    • EICMP – Displays ICMPv4 network errors
    • TCP – Displays TCPv4 network traffic
    • ETCP – Displays TCPv4 network errors
    • UDP – Displays UDPv4 network traffic
    • SOCK6, IP6, EIP6, ICMP6, UDP6 are for IPv6
    • ALL – This displays all of the above information. The output will be very long.

     

  • SAMBA (Real Time Checks)

    • What

      • wbinfo -t (test API)

      • wbinfo -g (list groups)

      • wbinfo -i <NETBIOS_NAME\user_name> (return user name in AD)

      • wbinfo -m (check domain membership(s))
  • ZFS 
    • zfs list
    • zpool status  -vv