Try this:

insert into PendingIO(

[database],

Physical_name,

io_pending,

io_pending_ms_ticks,

io_type,

num_of_reads,

num_of_writes

)

SELECT

DB_NAME(mf.database_id) AS [Database],

mf.physical_name ,

r.io_pending,

r.io_pending_ms_ticks,

r.io_type,

fs.num_of_reads,

fs.num_of_writes

FROM

sys.dm_io_pending_io_requests AS r

INNER JOIN sys.dm_io_virtual_file_stats(NULL, NULL) AS fs

ON r.io_handle = fs.file_handle

INNER JOIN sys.master_files AS mf

ON fs.database_id = mf.database_id

AND fs.file_id = mf.file_id

ORDER BY

r.io_pending,

r.io_pending_ms_ticks DESC;