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July 23rd, 2012 12:00
I need some help to interpret the symstat output
Hello All,
I have a ticket to investigate on why a sun server with Oracle Database is running with poor performance . The server is using VMAX luns .
The disks are configured on R5 (7+1) .
I only count with the symstat command to try to sort out this issue.
Please see below the output of one of the Luns. ( the tendency is the same in the other Luns related with this DB) .
IO/sec KB/sec % Hits %Seq Num WP
12:30:14 READ WRITE READ WRITE RD WRT RD WRT Tracks
146D (Not Visible ) 0 0 0 0 N/A N/A N/A N/A 35
146D (Not Visible ) 0 0 0 0 N/A N/A N/A N/A 4
146D (Not Visible ) 2 2 6 1029 100 100 0 0 4
146D (Not Visible ) 3 8 5 402 67 100 0 0 9
146D (Not Visible ) 0 5 0 23 N/A 100 N/A 0 7
146D (Not Visible ) 0 11 0 46 N/A 100 N/A 0 14
146D (Not Visible ) 0 0 0 0 N/A N/A N/A N/A 16
146D (Not Visible ) 0 0 0 0 N/A N/A N/A N/A 80
146D (Not Visible ) 0 5 0 298 N/A 100 N/A 0 6
146D (Not Visible ) 0 4 0 1594 N/A 100 N/A 0 178
146D (Not Visible ) 0 5 0 1411 N/A 100 N/A 0 3
146D (Not Visible ) 0 0 0 0 N/A N/A N/A N/A 48
146D (Not Visible ) 0 5 0 571 N/A 100 N/A 0 17
146D (Not Visible ) 0 2 0 1582 N/A 100 N/A 0 32
146D (Not Visible ) 0 5 1 1315 N/A 100 N/A 0 8
146D (Not Visible ) 0 11 0 692 N/A 100 N/A 0 8
146D (Not Visible ) 0 11 0 1709 N/A 100 N/A 0 20
The tendency is the same for each one of the Luns , as you can see I have a big number on KB/sec ( Writes) and small number of IO/sec (Writes).
Based on this info does enybody could give me a Hint on this? I would appreciate If somebody could tell me any suggestion and what else I can do,
I understand is not easy to get a final conclusion on this way but any help is welcome.
Thank you