gtpo1m29Operations

ZBUFC THRESHLD-Display or Change I/O Queue Threshold Value

Use this command to display or change the current I/O queue threshold value for all 3990 record cache subsystem (RCS) control units.

Requirements and Restrictions

This command is valid for only 3990 RCSs.

Format




value
is a decimal value, from 1-32 767, that represents the maximum queue depth for each device.

This value is used to calculate the maximum overall I/O queue threshold value that the 3990 RCS can tolerate during degraded caching operations.

If you do not specify a value, the device threshold value that is currently retained in the RCS status table (SSST) is displayed.

Additional Information

Examples

The current I/O queue threshold value for the 3990 RCS devices is displayed in the following example.

+--------------------------------------------------------------------------------+
|User:   ZBUFC THRES                                                             |
|                                                                                |
|System: BUFC0011I 08.06.02 RCS DEVICE I/O QUEUE THRESHOLD VALUE - 16384         |
+--------------------------------------------------------------------------------+

The current I/O queue threshold value for the 3990 RCS devices is changed in the following example.

+--------------------------------------------------------------------------------+
|User:   ZBUFC THRES 1234                                                        |
|                                                                                |
|System: BUFC0011I 08.06.41 RCS DEVICE I/O QUEUE THRESHOLD VALUE -  1234         |
+--------------------------------------------------------------------------------+

Related Information

See the following for more information about record caching: