Just to add briefly to everything that has been said already, certain
channel program orders may run for a long time, commit is one of them that
will force the destage of tracks to disk. If you use the synchronous
version, and it has not completed, MIH can get involved, so to prevent that
from happening, you can use the asynchronous version by requesting a number
from the storage controller. Then, using that number, you can interrogate
the status of your request. Much like getting a number at the supermarket,
then coming back and saying is order 57 ready. Before you can do that
however, you must supply the CFW ID if it is active, therefore an additional
step is required to get the CFW ID before you can request a number. That
could be why some vendors request CFW be set off. My .02.
Bill
From: John Ticic <[EMAIL PROTECTED]>
Reply-To: IBM Mainframe Discussion List <[email protected]>
To: [email protected]
Subject: Re: CACHEFASTWRITE
Date: Thu, 19 Apr 2007 09:39:05 +0200
-- snip --
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.
-- snip --
My mistake Ron. The CFW command does indeed apply to the whole subsystem
(also true for IBM ESS and DSx000).
John
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