Displaying Buffer Information
In Displays the History Buffer for the Specified VSAN, on page 295, the Key Counter column displays the
32-bit value maintained by Cisco MDS switches. This value is incremented when any port changes state in
that VSAN. The key counter (a 32-bit value) is incremented when a FICON-related configuration is changed.
Host programs can increment this value at the start of the channel program and then perform operations on
multiple ports. The director history buffer keeps a log of which port address configuration was changed for
each key-counter value.
The director history buffer provides a mechanism to determine the change in the port state from the previous
time when a value was contained in the key counter.
Displays the History Buffer for the Specified VSAN
switch# show ficon vsan 20 director-history
Director History Buffer for vsan 20
---------------------------------------------
Key Counter Ports Address
Changed
---------------------------------------------
74556 43
74557 44
74558 45
74559 46
74560 47
74561 48
74562 49
74563 50
74564 51
74565 52
74566 53
74567 54
74568 55
74569 56
74570 57
74571 58
74572 59
74573 60
74574 61
74575 62
74576 63
74577 64
74578
74579
74580 1-3,5,10,12,14-16,34-40,43-45,47-54,56-57,59-64
74581 3,5
74582 64
74583
74584 1-3,10,12,14-16,34-40,43-45,47-54,56-57,59-64
74585 1
74586 2
74587 3
Viewing the History Buffer
In the directory history buffer, the Key Counter column displays the 32-bit value maintained by Cisco MDS
switches. This value is incremented when any port changes state in that VSAN. The key counter (a 32-bit
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
295
Configuring FICON
Displaying Buffer Information
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