Displaying Buffer Information; Viewing The History Buffer - Cisco MDS 9000 Series Configuration Manual

Configuring FICON

Displaying Buffer Information

In Displays the History Buffer for the Specified VSAN, on page
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
---------------------------------------------
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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
Ports Address
Changed
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Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
Displaying Buffer Information
295, the Key Counter column displays the
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