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12 Posts
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715
Do i require to freeze the i/o for spliting the BCV in DR
I have most setup on SRDF and in sync mode, the R2 devices are concurrent devices so we thinking of using DR ( R2) for BCV maintenance. logically R2 is Write disable...do i require to freeze the i/o on R1 for splitting the BCV on R2
if it is in R1 i would prefer to bringing the application or database down to split.
i need thought in this one...
my only concern is it is SYNC mode R1-R2.
if it is in R1 i would prefer to bringing the application or database down to split.
i need thought in this one...
my only concern is it is SYNC mode R1-R2.
GlenH
141 Posts
0
May 16th, 2007 15:00
To get a consistent BCV image from either the R1 or R2 side, you need to do at least one of the following:
1. use Timefinder Consistency groups and perform a -consistent split. This split will hold the writes to the R1 devices whilst the split occurs - in this way, you are getting a consistent, crash recoverable image on the BCV as no I/O is performed during the split process. The write holding is done by the symmetrix or by powerpath (if you have older microcode).
2. use some type of freeze / thaw process which essentially does the same as above but at the database layer.
3. Use a database backup technique like hot backup mode during the split process. In this way, you can make the database consistent by using the regular database roll-forward/backward on the BCV itself after the split has completed.
4. Use none of the above, but have your data solely on 1 hyper volume.
The bottom line is that just performing a regular split of a BCV without any additional "help" does not guarantee you a consistent image, but you might get "lucky" some of the time..
Glen.
Kiran3
410 Posts
0
May 10th, 2007 03:00
jford11
20 Posts
1
May 16th, 2007 05:00
A reason to NOT freeze the I/O to the R2 is that you then can maintain the integrity of your DR site.
Ryderp
13 Posts
1
May 25th, 2007 10:00