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Displaying LUN information

Types of information you can display  Top

You can display the following types of information about LUNs:

Displaying command-line help  Top

To display command-line help, complete the following steps.

Step

Action
1

On the storage system's command line, enter the following command:

lun help

Result

A list of all LUN subcommands is displayed:

lun help          - List LUN (logical unit of block storage) commands

lun config-check  - Check all lun/igroup/fcp settings for correctness

lun clone         - Manage LUN cloning

lun comment       - Display/Change descriptive comment string

lun create        - Create a LUN

lun destroy       - Destroy a LUN

lun map           - Map a LUN to an initiator group

lun move          - Move (rename) LUN

lun offline       - Stop block protocol access to LUN

lun online        - Restart block protocol access to LUN

lun resize        - Resize LUN

lun serial        - Display/change LUN serial number

lun set           - Manage LUN properties

lun setup         - Initialize/Configure LUNs, mapping

lun share         - Configure NAS file-sharing properties

lun show          - Display LUNs

lun snap          - Manage LUN and snapshot interactions

lun stats         - Displays or zeros read/write statistics for LUN

lun unmap         - Remove LUN mapping
2

To display the syntax for any of the subcommands, enter the following command:

lun help subcommand

Example

lun help show

Displaying statistics  Top

To display the number of data read and write operations and the number of operations per second for LUNs, complete the following step.

Step

Action
1

Enter the following command:

lun stats -z -i interval -c count -o [-a | lun_path]

-z zeros statistics

Note
The statistics start at zero at boot time.

-i interval is the interval, in seconds, at which the statistics are displayed.

-c count is the number of intervals. For example, the lun stats -i 10 -c 5 command displays statistics in ten-second intervals, for five intervals.

-o displays additional statistics, including the number of QFULL messages the storage system sends when its SCSI command queue is full and the amount of traffic received from the partner storage system.

-a shows statistics for all LUNs.

lun_path displays statistics for a specific LUN.

Example

lun stats -o -i 1

Read    Write Other QFull   Read  Write Average  Queue  Partner       Lun

  Ops   Ops    Ops           kB   kB    Latency  Length  Ops kB

    0   351     0     0      0  44992   11.35    3.00     0   0   /vol/tpcc/log_22

    0   233     0     0      0  29888   14.85    2.05     0   0   /vol/tpcc/log_22

    0   411     0     0      0  52672    8.93    2.08     0   0   /vol/tpcc/log_22

    2     1     0     0     16      8    1.00    1.00     0   0   /vol/tpcc/ctrl_0

    1     1     0     0      8      8    1.50    1.00     0   0   /vol/tpcc/ctrl_1

    0   326     0     0      0  41600   11.93    3.00     0   0   /vol/tpcc/log_22

    0   353     0     0      0  45056   10.57    2.09     0   0   /vol/tpcc/log_22

    0   282     0     0      0  36160   12.81    2.07     0   0   /vol/tpcc/log_22

Displaying LUN mapping information  Top

To display LUN mapping information, complete the following step.

Step

Action
1

On the storage system's command line, enter the following command:

lun show -m

Result


 

LUN path               Mapped to         LUN ID  Protocol


 

--------------------------------------------------------
/vol/tpcc/ctrl_0       host5                0     iSCSI


 

/vol/tpcc/ctrl_1       host5                1     iSCSI


 

/vol/tpcc/crash1       host5                2     iSCSI


 

/vol/tpcc/crash2       host5                3     iSCSI


 

/vol/tpcc/cust_0       host6                4     iSCSI


 

/vol/tpcc/cust_1       host6                5     iSCSI


 

/vol/tpcc/cust_2       host6                6     iSCSI







 




Displaying status of space reservations 
 Top



 

To display the status of space reservations for LUNs in a volume, complete the following step.

 





Step




Action







 
1



Enter the following command:

 

lun set reservation lun_path



 Example


 




 

lun set reservation /vol/lunvol/hpux/lun0


 

Space Reservation for LUN /vol/lunvol/hpux/lun0 (inode 
3903199): enabled







 




Displaying additional LUN information
 Top



 

To display additional information about LUNs, such as the serial number and ostype (displayed as Multiprotocol Type), and maps, complete the following step.

 





Step




Action







 
1



On the storage system's command line, enter the following command to display LUN status and characteristics:

 

lun show -v



 Example


 


 

/vol/tpcc_disks/cust_0_1 382m (400556032)     (r/w, online, mapped)


 

        Serial#: VqmOVYoe3BUf


 

        Share: none


 

        Space Reservation: enabled


 

        Multiprotocol Type: aix


 

        SnapValidator Offset: 1m (1048576)


 

        Maps: host5=0


 

/vol/tpcc_disks/cust_0_2 382m (400556032)     (r/w, online, mapped)


 

        Serial#: VqmOVYoe3BV6


 

        Share: none


 

        Space Reservation: enabled


 

        Multiprotocol Type: aix


 

        SnapValidator Offset:      1m (1048576)


 

        Maps: host6=1







 





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Part No. 210-01094_B0

File: c5lun-f3.htm

Last updated: 08-Dec-2005 13:25:28