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тАО12-06-2011 06:14 PM
тАО12-06-2011 06:14 PM
Hello,
please explain application snapshot feature. Practical use and advantages.
I used a lot snapshot (checkpoints) in hyper-v for having the ability to come back to previous OS state.
Does application snapshot relates to backup? How we use it in P4000 environment?
Thx.
Solved! Go to Solution.
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тАО12-08-2011 08:13 AM
тАО12-08-2011 08:13 AM
SolutionWe just installed this same unit and I'm currently working to understand the snapshots myself. I'm a SQL Server DBA so take my comments in that context.
The application managed snapshot quiesces the application, the point in time does not. Quiesce is a fancy word for pausing writes so you get a consistent view of the data.
The snapshots are super fast, like instant, because they are just pointers back to the original data. Subsequent snapshots track any changes. Because these snapshots are simply pointers (and not a compete copy of the data), they are depenent on the original data being available. So this can protect you against logical problems (in my case, someone drops a table), however, they don't help if anything happens to the original volume or LUN. So you still need to backup to a secondary location.
Again, this is my understanding after only a month or so with the unit. Please take with a grain of salt.
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тАО12-08-2011 12:59 PM
тАО12-08-2011 12:59 PM
Re: need explanation of application snapshot
The original volume will always be protected because all new writes (which are the only things that can corrupt a volume) go to new blocks. When the next snap occurs, that is just another layer ontop of the old lun - therefore you can mount different points in time.
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тАО12-08-2011 07:01 PM - edited тАО12-08-2011 07:02 PM
тАО12-08-2011 07:01 PM - edited тАО12-08-2011 07:02 PM
Re: need explanation of application snapshot
Thanks!
Robert, I marked Henry's answer as a solution. Anyway you confirm that his answer is Almost 100% accurate.
:)