Is there a reliable method to keep a mirror copy of the EVA4000 data? I want to implement host-level mirroring or software mirroring that can do this. Can you let me know how I can do this?
In any case, you must answer a few questions before selecting the type of product that will best meet your business requirements:
What type of data are you trying to protect? Certain products are database-aware and will take into consideration logs and configuration files during creation of the copy or snapshot. These products interface with the database application to ensure data integrity and provide the ability to "roll-forward" using transaction logs.
How cluster-aware must the software be? Some of the products listed above will range from fully automated failover capability to failover with manual intervention (i.e., Datalink, XOSoft or NeverFail).
What level of granularity do you require with respect to the recovery point objective (RPO)? Some software products can "journal" the changes allowing you to "play-back" changes to a specific point-in-time. (i.e., TimeData) or allow multiple point-in-time copies (FalconStor).
By first answering these questions, you will be able to narrow down your search to the products that meet your requirements. The rest of the selection process can then focus on added functionality and cost.
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This was first published in June 2006