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June 11th, 2010 11:00
Snapview questions
Hi,
About Snapview :
-In case of problem in the production system (under oracle), can we start the production directly with the last snapshot
without restoring ?
-Is it possible to get the production and the snapshot together on line with 2 oracle instances ?
-Does Snapview automaticaly take into account the consistency of the database ?
Thanks for answer
Consty
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AranH1
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June 11th, 2010 16:00
Consty,
Since a snapshot is just a bitmap image of the source device it will have the same disk signature as the source device, and will appear to be a duplicate deivce to the production host and therefore could cause problems if you tray and mount the snapshot back to the production host. Where a snapshot is used in a DR scenario is to restore to a known good point in time using the snapshot to resynch back to the production device.
Snapview devices will only be crash consistent unless you combine the snapview commands with host application commands that put the application into a hot backup state prior to creating the session and then relesing the application after the session has been created. Remeber that the snapshot session is taken from the array perspective and all it can see is blocks written and is not application aware. If you have data and log files spread over multiple LUNs for a database you can use the snapview cli to create a consistent set of sessions across all LUNs at the same time. This will give you write order consistency across that group of LUNs in your session.