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Lund Performance Solutions

SOS NFS Summary

The NFS Summary Screen

The NFS Summary screen displays information about the network file system (NFS). A system can be a server (a system that provides its local disks to other systems), a client (a system that uses non-local disks), or both. An example of the NFS CLIENT SUMMARY display is shown in Figure 17.1.


Figure 17.1 SOS NFS Summary screen: NFS CLIENT SUMMARY
To access the NFS Summary 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 n (NFS Summary). The NFS Summary screen will display.

    • Additional Command Keys for the NFS Summary Screen

    In addition to the command keys listed in the Main Commands screen, the following commands keys can be used to modify the display of the NFS Summary screen:
  • The x command key can be used to toggle between NFS call rates and NFS call percentages. The section headings indicate which data is shown.
  • The c command key can be used to toggle between NFS client data and NFS server data. The screen title indicates which data is displayed.

    • NFS Client Summary Screen Display Items

    The NFS CLIENT SUMMARY data items are described in this section. The data items for the NFS SERVER SUMMARY are described in the next section, "NFS Server Summary Screen Display Items".

    NFS CLIENT SUMMARY

    The NFS CLIENT SUMMARY portion of the NFS Summary screen provides bad NFS call information associated with the NFS client.
    Bad NFS Calls
    The Bad NFS Calls data item represents:
  • The number of bad NFS calls accumulated during the current interval, when the screen is set to display NFS call rates (see "Additional Command Keys for the NFS Summary Screen").
  • The percentage of NFS calls that are bad NFS calls, when the screen is displaying NFS call percentages.

    • NFS V2 RATE or PERCENT

    The NFS V2 RATE/PERCENT portion of the NFS CLIENT SUMMARY provides rate and percentage information for the NFS V2 calls. To toggle between rates and percentage displays, type the x command key. Each data item is defined in the next table.
    Table 17.1 SOS (Client) NFS V2 RATE and PERCENT data items
    Data Item
    RATE Definition
    PERCENT Definition
    NULL
    The number of null calls per second.
    The percentage of all NFS V2 calls that are null calls.
    GTATTR
    The number of getattr calls per second.
    The percentage of all NFS V2 calls that are getattr calls.
    SETATTR
    The number of setattr calls per second.
    The percentage of all NFS V2 calls that are setattr calls.
    ROOT
    The number of root calls per second.
    The percentage of all NFS V2 calls that are root calls.
    LOOKUP
    The number of lookup calls per second.
    The percentage of all NFS V2 calls that are lookup calls.
    RDLINK
    The number of readlink calls per second.
    The percentage of all NFS V2 calls that are readlink calls.
    READ
    The number of read calls per second.
    The percentage of all NFS V2 calls that are read calls.
    WCACHE
    The number of writecache calls per second.
    The percentage of all NFS V2 calls that are writecache calls.
    WRITE
    The number of write calls per second.
    The percentage of all NFS V2 calls that are write calls.
    CREATE
    The number of create calls per second.
    The percentage of all NFS V2 calls that are create calls.
    REMOVE
    The number of remove calls per second.
    The percentage of all NFS V2 calls that are remove calls.
    LINK
    The number of link calls per second.
    The percentage of all NFS V2 calls that are link calls.
    SLINK
    The number of symlink calls per second.
    The percentage of all NFS V2 calls that are symlink calls.
    MKDIR
    The number of mkdir calls per second.
    The percentage of all NFS V2 calls that are mkdir calls.
    RMDIR
    The number of rmdir calls per second.
    The percentage of all NFS V2 calls that are rmdir calls.
    RDDIR
    The number of readdir calls per second.
    The percentage of all NFS V2 calls that are readdir calls.
    STATFS
    The number of statfs calls per second.
    The percentage of all NFS V2 calls that are statfs calls.

    NFS V3 RATE or PERCENT

    The NFS V3 PERCENT portion of the NFS CLIENT SUMMARY provides rate and percentage information for the NFS V3 calls. Each data item is defined in Table 17.2.
    Table 17.2 SOS (Client) NFS V3 RATE and PERCENT data items
    Data Item
    RATE Definition
    PERCENT Definition
    NULL
    The number of null calls per second.
    The percentage of all NFS V3 calls that are null calls.
    GTATTR
    The number of getattr calls per second.
    The percentage of all NFS V3 calls that are getattr calls.
    STATTR
    The number of setattr calls per second.
    The percentage of all NFS V3 calls that are setattr calls.
    LOOKUP
    The number of lookup calls per second.
    The percentage of all NFS V3 calls that are lookup calls.
    ACCESS
    The number of access calls per second.
    The percentage of all NFS V3 calls that are access calls.
    RDLINK
    The number of readlink calls per second.
    The percentage of all NFS V3 calls that are readlink calls.
    READ
    The number of read calls per second.
    The percentage of all NFS V3 calls that are read calls.
    WRITE
    The number of write calls per second.
    The percentage of all NFS V3 calls that are write calls.
    CREATE
    The number of create calls per second.
    The percentage of all NFS V3 calls that are create calls.
    MKDIR
    The number of mkdir calls per second.
    The percentage of all NFS V3 calls that are mkdir calls.
    SLINK
    The number of symlink calls per second.
    The percentage of all NFS V3 calls that are symlink calls.
    MKNOD
    The number of mknod calls per second.
    The percentage of all NFS V3 calls that are mknod calls.
    REMOVE
    The number of remove calls per second.
    The percentage of all NFS V3 calls that are remove calls.
    RMDIR
    The number of rmdir calls per second.
    The percentage of all NFS V3 calls that are rmdir calls.
    RENAME
    The number of rename calls per second.
    The percentage of all NFS V3 calls that are rename calls.
    LINK
    The number of link calls per second.
    The percentage of all NFS V3 calls that are link calls.
    RDDIR
    The number of readdir calls per second.
    The percentage of all NFS V3 calls that are readdir calls.
    RDDIRP
    The number of readdirplus calls per second.
    The percentage of all NFS V3 calls that are readdirplus calls.
    FSSTAT
    The number of fsstat calls per second.
    The percentage of all NFS V3 calls that are fsstat calls.
    FSINFO
    The number of fsinfo calls per second.
    The percentage of all NFS V3 calls that are fsinfo calls.
    PCONF
    The number of pathconf calls per second.
    The percentage of all NFS V3 calls that are pathconf calls.
    COMMIT
    The number of commit calls per second.
    The percentage of all NFS V3 calls that are commit calls.

    RPC

    The RPC portion of the NFS CLIENT SUMMARY provides remote procedure call (RPC) information. Each RPC data item is described in the following table.
    Table 17.3 SOS (Client) RPC data items
    Data Item
    Description
    Calls
    The number of client RPC calls made per second.
    Bad Calls
    The number per second of client RPC calls that returned with an error. This number includes time-outs and interruptions.
    Retrans
    The number per second of client RPC calls that were retransmitted. A call is retransmitted when no response is received from the server within the time-out period.
    Timeouts
    The number of RPC calls that timed-out per second. This number includes all retransmissions and timeouts that are counted as bad calls (with no retransmission).
    Badxids
    The number of duplicate requests per second.
    A badxid is defined in SOS as a duplicate transmission. Every outgoing NFS request is assigned a unique sequential identifier. Requests are retransmitted if the server does not respond within a set time-out period. When the server eventually does respond, it is possible for the client to respond to the same request multiple times. Each duplicate transmission is counted as a badxid. Badxids are an indication that the server is not responding quickly enough.

    NFS SERVERS

    The following data is provided for each NFS server in the NFS CLIENT SUMMARY. Each NFS SERVER data item is described in the following table.
    Table 17.4 SOS (Client) NFS SERVER data items
    Data Item
    Description
    No Resp
    The number of major timeouts incurred by NFS servers per second. (A major time-out will not result in a retransmission.)
    Rd Rate
    The number of read requests per second.
    Wr Rate
    The number of write requests per second.
    Wt Time
    The average number of milliseconds consumed while a request waited in the outgoing requests queue before processing.
    Srv Time
    The average number of milliseconds taken to process an NFS request.
    Avg QLen
    The average number of client requests waiting for server response.
    The NFS SERVER SUMMARY is discussed on 131.

    NFS Server Summary Screen Display Items

    An example of the NFS SERVER SUMMARY screen display is shown in Figure 17.2.


    Figure 17.2 SOS NFS Summary screen: NFS SERVER SUMMARY

    NFS SERVER SUMMARY

    The NFS SERVER SUMMARY portion of the NFS Summary screen provides bad NFS call information.
    Bad NFS Calls
    The Bad NFS Calls data item represents:
  • The number of bad NFS calls accumulated during the current interval.
  • The percentage of NFS calls that are bad NFS calls.

    • NFS V2 RATE or PERCENT

    The NFS V2 RATE/PERCENT portion of the NFS SERVER SUMMARY provides rate and percentage information for the NFS V2 calls. To toggle between rates and percentage displays, type the x command key. Each data item is defined in Table 17.1.
    Table 17.5 SOS (Server) NFS V2 RATE and PERCENT data items
    Data Item
    RATE Definition
    PERCENT Definition
    NULL
    The number of null calls per second.
    The percentage of all NFS V2 calls that are null calls.
    GTATTR
    The number of getattr calls per second.
    The percentage of all NFS V2 calls that are getattr calls.
    STATTR
    The number of setattr calls per second.
    The percentage of all NFS V2 calls that are setattr calls.