On Mar 8, 2006, at 9:42 AM, Bruce Black wrote:
I understand the idea that
the copy is immediately available before the physical tracks are
copied
and was just wondering what kind of impact the background copy would
have on the foreground tasks running against the same physical disks.
Rex, that is an interesting question on which I have seen very
little data. All of the replication technologies which depend on a
background copy (almost all of them) have to have some impact on
performance. I am told that the background copies are generally
lower priority than host-initiated I/Os, but I have to believe that
they have some impact. If you start the copies for hundreds of
volumes simultaneously (such as when you are initiating point-in-
time backups) all that I/O has to have an impact on normal I/O.
But I have never seen any vendor or user speak of it. Hopefully
that means that it is just not noticeable.
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
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