We are adding a new counter to PerfDisk:

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total_transfers             Total number of disk operations involving data
                            transfer initiated per second 
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user_read_blocks            Number of blocks transferred for user read
                            operations per second 
------------------------------------------------------------------------------
user_read_latency           Average latency per block in microseconds for
                            user read operations 
------------------------------------------------------------------------------
user_reads                  Number of disk read operations initiated each
                            second for retrieving data or metadata associated
                            with user requests 
------------------------------------------------------------------------------
user_write_blocks           Number of blocks transferred for user write
                            operations per second 
------------------------------------------------------------------------------
user_write_latency          Average latency per block in microseconds for
                            user write operations
------------------------------------------------------------------------------
user_writes                 Number of disk write operations initiated each
                            second for storing data or metadata associated
                            with user requests 

Please contact us if you require any additional counters for your environment. Counters provided by the NetApp filer can easily be displayed using  –discover=counters:

$ ./get_netapp_perfdata.pl -H filer -o disk --discover=counters