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Manual: Volume Replicator 4.1 Administrator's Guide   

Using the vrstat Display Commands

This section describes the VVR commands that you can use to view statistics about the RLINKs and the volumes in an RVG, for all the hosts in an RDS. The vrstat command combines the output of commands such as
vxrlink stats, vxrlink status, vxstat, and vxmemstat in a single command to display the statistics about the RLINKs and the volumes in an RVG, for all hosts in the RDS.

The messages are displayed at a default frequency of 10 seconds, which is the frequency at which the vrstat command collects the statistics. To change the frequency of the display, set the VRAS_STATS_FREQUENCY environment variable to a required value in the /etc/vx/vras/vras_env file.

After setting the environment variable to a new value, restart the vradmind daemon by issuing the following commands:




# /sbin/init.d/vras-vradmind.sh stop 
# /sbin/init.d/vras-vradmind.sh start 

Displaying the Consolidated Statistics

To display the consolidated statistics of the RLINKs, SRL, data volumes, and memory tunables for the RDSs on a host, use the vrstat command without specifying any option.

To view the consolidated statistics:


#  vrstat

Displaying the RLINK Information for All the Hosts in the RDS

The vrstat -R command displays detailed statistics for the RLINKs on all the hosts in an RDS. This information can be used to assess connectivity and network problems between the hosts. The vrstat -R command can be executed from the Primary and the Secondary. The output of this command is a combination of the outputs of the vxrlink stats and vxrlink status commands.

To view information about all the RLINKs in an RDS:


#  vrstat -R [local_rvgname]
The argument local_rvgname is the name of the RVG on the local host and is optional. The local RVG name represents its RDS.
If you specify the local_rvgname name, the vrstat -R command displays the information for all the RLINKs for the specified RVG. Otherwise, the command displays the information for all the RLINKs for all the RDSs.

The output of this command resembles:


      Mon Oct 27 15:44:21 2003
      Replicated Data Set hr_rvg:

      Data Status:
      london: up-to-date.

      Network Statistics:
          Messages                Errors                  Flow Control
         --------                ------                  ------------
      #  Blocks  RT(msec)  Timeout  Stream  Memory Delays  NW Bytes   NW Delay  Timeout
      seattle - london
      260     133120  5       1       0       0       333     178000    1        20
      279     0       11      0       0       0       0       100000    1        30

For more information on the fields in the output, see Getting and Using Network Performance Data (vxrlink stats).

Displaying Information About All the Data Volumes for All the Hosts in the RDS

The vrstat -V command displays detailed statistics for all the data volumes associated with the specified RVG on each host in the RDS. The vrstat -V command can be executed from the Primary and the Secondary.

To view information about all the data volumes associated with an RVG in an RDS:


#  vrstat -V [local_rvgname]
The argument local_rvgname is the name of the RVG on the local host and is optional. The local RVG name represents its RDS.
If you specify the local_rvgname name, the vrstat -V command displays information about all the volumes associated with the specified RVG. Otherwise, the command displays information about all the volumes in all the RDSs.

The output of this command resembles:


      Mon Oct 27 15:49:15 2003
      Replicated Data Set hr_rvg:

      Data Volume-I/O Statistics:
      HOST        NAME      OPERATIONS            BLOCKS        AVG TIME(ms)
                     READ     WRITE     READ     WRITE     READ    WRITE
      seattle        hr_dv01        0        0    0     0   0.0     0.0
      london        hr_dv01        0      412     0   210944      0.0    12.0

      Mon Oct 27 15:49:25 2003
      Replicated Data Set hr_rvg:

      Data Volume-I/O Statistics:
      HOST        NAME       OPERATIONS            BLOCKS        AVG TIME(ms)
                     READ     WRITE     READ    WRITE     READ    WRITE
      seattle        hr_dv01        0     0     0     0   0.0     0.0
      london        hr_dv01        0     0     0     0   0.0     0.0

The output of this command includes the following details:

  • The host_name of the host for which the information is being displayed.
  • Name of the volume for which the information is being displayed.
  • The total number of read and write operations performed on a volume.
  • Number of blocks that have been read from or written to the volume.
  • Average time in milliseconds to complete the read and write operations.

Displaying Information About the SRL Volumes for All the Hosts in the RDS

The vrstat -S command displays detailed statistics about the SRL for every host within the RDS. This command can be executed from the Primary and the Secondary.

To view information on all the SRL volumes for every host in an RDS:


#  vrstat -S [local_rvgname]
The argument local_rvgname is the name of the RVG on the local host and is optional. The local RVG name represents its RDS.
If you specify the local_rvgname name, the vrstat -S command displays information about the SRL in the RDS. Otherwise, the command displays information about the SRL in all the RDSs.

The output of the vrstat command resembles:


      Mon Oct 27 15:53:11 2003
      Replicated Data Set hr_rvg:

      SRL-I/O Statistics:
      HOST        NAME          OPERATIONS           BLOCKS         AVG TIME(ms)
                                          READ     WRITE      READ     WRITE    READ  WRITE
      seattle   hr_srl           0       258         0    132885 0.0   17.6
      london    hr_srl           0         0         0         0 0.0    0.0

      Mon Oct 27 15:53:21 2003
      Replicated Data Set hr_rvg:

      SRL-I/O Statistics:
      HOST        NAME          OPERATIONS           BLOCKS         AVG TIME(ms)
                                          READ     WRITE      READ     WRITE    READ  WRITE
      seattle   hr_srl           0       143         0      73430    0.0   17.6
      london    hr_srl           0         0         0         0    0.0    0.0

The output of this command includes the following details:

  • The host_name of the host for which the information is being displayed.
  • Name of the SRL volume for which the information is being displayed.
  • The total number of read and write operations performed on a volume.
  • Number of blocks that have been read from or written to the volume.
  • Average time in milliseconds to complete the read and write operations.

Displaying Information About the Memory Tunable Parameters for All the Hosts in the RDS

The vrstat -M command displays detailed information about the memory tunable parameters. This command can be executed from the Primary and the Secondary. The output of the vrstat -M command is similar to the output displayed by the vxmemstat command.

If you specify the local_rvgname name with the vrstat -M command, it displays the information about the memory tunables for all the hosts in that RDS. Otherwise, the command displays information about the memory tunable parameters for all the hosts in all the RDSs.

To view information about the memory tunable parameters:


#  vrstat -M [local_rvgname]
The argument local_rvgname is the name of the RVG on the local host and is optional. The local RVG name represents its RDS.

The output of this command resembles:


      Mon Oct 27 15:57:15 2003
      Replicated Data Set hr_rvg:

      Memory-pool Statistics:
      Host       Pool        DG      Min      Max      In    Allocated  Max   Waiting
                     Size     Size     Use              Used         
      ------    ----------  ----    ------   ------   -----  ---------- ----- -------
      seattle   Voliomem     -       1024    12443      0     1024        0    no
      seattle   NMCOM-hr_rvg dg1     1024     4096      0     1024        0    no
      seattle   RViomem      -       1024    12443      0     1024        0    no
      seattle   WRSHIP       -       1024     4096      0     1024        0    no
      seattle   Readback     -       1024     4096      0     1024        0    no
      london    Voliomem     -       1024    12441      0     1024        0    no
      london    NMCOM-hr_rvg dg1     1024     4096      0     1024        0    no
      london    RViomem      -       1024    12441      0     1024        0    no
      london    WRSHIP       -       1024     4096      0     1024        0    no
      london    Readback     -       1024     4096      0     1024        0    no

The output of the vrstat command includes the following details:

  • The host_name of the host for which the information is being displayed.
  • Name of the memory tunable parameter.
  • Name of the disk group in which this RVG is present.
  • Minimum and maximum size for each tunable parameter.
  • The amount of the allocated space that is being used.
  • Amount of space allocated for the parameter.
  • Maximum space that has been used by a parameter.

Determining the Network Bandwidth Being Used by VVR

Use the vrstat command to determine the network bandwidth being used by VVR.

  To view the network bandwidth currently being used by VVR


 # vrstat -R local_rvgname
The argument local_rvgname is the name of the RVG on the local host and is optional. The local RVG name represents its RDS.
If you specify the local_rvgname name, the vrstat -R command displays the information about the RLINKs for the specified RVG. Otherwise, the command displays the information for all the RLINKs for all the RDSs.

Example:

To view the network bandwidth used by the RDS hr_rvg between the Primary seattle and the Secondary london, issue the following command on any host in the RDS:


 # vrstat -R hr_rvg

The output resembles:


Replicated Data Set hr_rvg:
Data Status:
london: DCM contains 1157888 Kbytes.
Network Statistics:
  Messages                Errors                  Flow Control
--------                ------                  ------------
#   Blocks RT(msec) Timeout Stream Memory Delays NW Bytes  NW Delay Timeout
seattle - london
356     182272  6       1       0       0       280     271000    1 10
339     0       15      0       0       0       0       100000    1 20
Bandwidth Utilization 72908 Kbps.
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Product: Volume Replicator Guides  
Manual: Volume Replicator 4.1 Administrator's Guide  
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