Call me amazed... but not long ago on here.. this was instantaneous..
now its some amount of time.. Did there just happen to by a hole in
the space time continuum (and only for certain people?).
Ed, let me have Scotty beam you up and explain it...
Sorry, Scottie is not available (actually he's dead) so let me try again.
The copy request is executed in moments, it appears to be complete
almost instantaneously. The hardware hides the background copy so
that you can access the copied data immediately, without waiting for
the physical copy to complete. The physical copy is the responsibility
of the disk control unit, not software, so it will complete even if the
op system is shutdown. I believe that it will even survive power
failures and most hardware failures. So there is almost no chance that
the background copy will not complete, and from the requestors point of
view, the request completed almost instantaneously.
Here's an analogy (you and I are old enough to appreciate this): back
when telegrams were common, Western Union would send a messenger to
delilver a printed copy (the "physical copy"). But when phones became
commonplace, to compete, they would often phone you to read you the
contents of a telegrram, then later they would deliver a hardcopy of the
gram. When is the gram delivered, when it was read, or when the
(background) copy is delivered?
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: [EMAIL PROTECTED]
sales info: [EMAIL PROTECTED]
tech support: [EMAIL PROTECTED]
web: www.innovationdp.fdr.com
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
