Consistency.
Personally, I believe if you have BCM then At-Time split is the way to go.
Ron
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Bruce Black
Sent: Saturday, 18 March 2006 12:30 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: virtual
At Time splits with Shadowimage and/or TrueCopy use Timestamps to initiate
the split and create consistency. There is no blockade of writes for a few
seconds while all the volumes are split.
Ron, you are right, ShadowImage doesn't operate quite the same as IBM
FlashCopy and EMC Consistent
Bruce,
At Time splits with Shadowimage and/or TrueCopy use Timestamps to initiate
the split and create consistency. There is no blockade of writes for a few
seconds while all the volumes are split.
Ron
With normal backups, and even with normal instant replication, I/O
consistency cannot be
In a recent note, Bruce Black said:
Date: Mon, 13 Mar 2006 11:11:16 -0500
Flashcopy has a consistent flash mode that makes it unnecessary to
suspend application updates, as long as the application is a logged
system doing dependant writes ...
I'm unfamiliar with the terms, but
Does DFSMS have a new facility for dependent writes that
somehow chains the writes together? Is it as simple as doing
all the writes in a single channel program with a guarantee
that the perceived updates of the backing store are congruent
with the order of the I/O requests?
As I use the term
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