In a message dated 4/19/2007 2:39:38 A.M. Central Daylight Time, [EMAIL PROTECTED] writes: >As far as I can see the CFW commands always apply to the whole subsystem, and have never applied to a single volume. >My past experience is that subsystem means the whole Storage Controller. My recent experience is with HDS only and this is how the command operates still. Should have added the 2105's doc to my post yesterday covering only 3990. The 2105 is the same - Set Subsystem Mode CCW lets you turn CFW on/off for the subsystem and DFW on/off for a device. That is all you can do with IBM and IBM-compatible DASD. There is no other CCW that is publicly documented by IBM to manipulate CFW and DFW. Other vendors controllers, however, may have the ability to manipulate CFW at a device level and DFW at the subsystem level. Check with your vendor. If they do this, then it is for sure they do not support the functions via IDCAMS, as this IBM utility uses only IBM CCWs to manipulate the various caching functions on what it expects is an IBM or IBM-compatible controller. Another vendor that supports CFW for a device or DFW for a subsystem will have to supply a vendor-specific utility program to use that non-IBM-compatible function. The meaning of the word "subsystem" varies from one controller model to another. Long ago, a subsystem was the entire controller (aka control unit) and all the devices/volumes therein. Today's subsystems may have more than one logical subsystem within the same box. To determine the definition of "subsystem" for your particular box, read the doc from that box's vendor. Some vendor's "boxes" can have thousands of devices/volumes in them, and for sure they can be configured/subdivided into many subsystems. Bill Fairchild Plainfield, IL
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