Operating System Monitor Data: File System and LAN

The operating system monitor displays the following data for hard disks, LAN, and file systems:

• For all physical hard disks on a host:
  • Device name of the hard disk
  • Hard disk usage - percentage of the time in which the hard disk is being used
  • Average queue length of an I/O request
  • Wait time in milliseconds during which a request waits in the wait queue
  • Service time in milliseconds for input/output
  • Transferred kilobytes per second
  • Number of disk operations per second
  • Disk response time in milliseconds
    Note

    In the periods  Previous Hours and  History, no values are displayed fort he physical disks.

• For all file systems on a host:
  • Name of the file system
  • Capacity of the file system in megabytes
  • Free storage space in the file system in megabytes
  • Free storage space in the file system as a percentage
    Note

    In the periods  Previous Hours and  History, only the free storage space in the file system is displayed, in megabytes and as a percentage.

• For all LAN interfaces on a host:
  • Name of the LAN interface
  • Data packets received per second
  • Data packets sent per second
  • Errors for received packets per second
  • Errors for sent packets per second
    Note

    In the periods  Previous Hours and  History, the errors for received and sent data packets are not displayed.

  • Collisions per second, in which two stations transport a packet at the same time on the same channel; this leads to the destruction of both packets and means that they must be sent again

Some values are not specified in some network interfaces; for example, there may not be a value for collisions per second in a token ring architecture. The values given here do not describe the actual network traffic. They describe the transfers performed with this interface. This means that the errors displayed here refer to the interface and not to the actual network segment.

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