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Lund Performance Solutions


SOS Disk Detail

The Disk Detail Screen

The Disk Detail screen displays detailed information about a specific disk.




Figure 32.1 SOS Disk Detail screen
To access the Disk Detail screen from any SOS display screen:
  • Type s from the SOS Enter command: prompt to view the Screen Selection Menu screen.
  • From the Screen Selection Menu screen, enter D (Disk Detail).
  • At the secondary prompt:
  • Press the Enter key to display the Disk detail information for the given disk.
  • Or, select another disk from the list.
  • The Disk Detail screen will display. An example of the screen is shown in Figure 32.1.
  • Use the y command key to toggle between the normal and extended process displays.
  • Disk Detail Display Items

    DISK DETAIL

    The DISK DETAIL portion of the Disk Detail screen displays workload identification information. The data items are described in the next table.
    Table 32.1 SOS DISK I/O DETAIL data items
    Data Item
    Description
    Dev
    The device identification number for each disk on the system.
    I/O%
    The percentage of all disk I/Os on the system performed by each disk during the interval.
    Qlen
    The average number of disk requests waiting to be serviced by each disk.
    Util%
    The percentage of time each disk was in use during the interval.
    Wait Time (ms)
    The average number of milliseconds an I/O request had to wait in the disk queue before being serviced for each disk.
    Service Time (ms)
    The average number of milliseconds an I/O request takes to be serviced once it is removed from the disk queue and processed.
    Logical
    Read Rate (/s)
    Logical reads per second (see "logical I/O").
    Write Rate (/s)
    Logical writes per second performed by a process.
    Avg Read Size (kb)
    The average size of a logical read.
    Avg Write Size (kb)
    The average size of a logical write.
    Physical
    Read Rate (/s)
    Physical reads per second (see "physical I/O").
    Write Rate (/s)
    Physical writes per second performed by a process.
    Avg Read Size (kb)
    The average size of a physical read.
    Avg Write Size (kb)
    The average size of a physical write.
    Raw
    Read Rate (/s)
    Raw memory reads per second (see "raw I/O").
    Write Rate (/s)
    Raw memory writes per second performed by a process.
    Avg Read Size (kb)
    The average size of a raw memory read.
    Avg Write Size (kb)
    The average size of a raw memory write.
    Virt Mem
    Read Rate (/s)
    Virtual memory reads per second (see "virtual memory I/O").
    Write Rate (/s)
    Virtual memory writes per second performed by a process.
    Avg Read Size (kb)
    The average size of a virtual memory read.
    Avg Write Size (kb)
    The average size of a virtual memory write.
    User FS
    Read Rate (/s)
    User reads per second (see "user I/O").
    Write Rate (/s)
    User writes per second performed by a process.
    Avg Read Size (kb)
    The average size of a user read.
    Avg Write Size (kb)
    The average size of a user write.
    SYS FS
    Read Rate (/s)
    System reads per second (see "system I/O").
    Write Rate (/s)
    System writes per second performed by a process.
    Avg Read Size (kb)
    The average size of a system read.
    Avg Write Size (kb)
    The average size of a system write.

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