Alan Altmark wrote:
On Wednesday, 07/26/2006 at 01:27 EST, J Leslie Turriff
<[EMAIL PROTECTED]> wrote:
Okay, now, wait; are you saying that the storage device _does_ have a
mechanism for communicating with the Linux filesystem to determine what
filesystem pages are still cached in main storage and have not yet been
commited to external storage?
No. I'm saying that an application that closes or flushes all of its open
files and then tells the filesystem "commit the filesystem to disk" (e.g.
sync) is then at a known point with respect to the dasd. It is free at
that point to kick off a flashcopy via some command or utility and start
running again.
_Only_ if all users of the filesystem agree!
It seems less straightforward to me if you have more than one
application writing to the filesystem, or if your application's file are
spread across filesystems.
--
Cheers
John
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