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Disaster Recovery - SQL vs VM Disk Replication


Disaster Recovery - SQL vs VM Disk Replication

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dhubbard
dhubbard
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Points: 10 Visits: 42
We are evaluating approaches to DR. For SQL Server we have the usual log shipping, replication, and various 'AlwaysOn' methods. The other approach is to use one of the Hypervisor or SAN based disk level replication technologies.

Certainly, one advantage of the SQL approaches is the the system at the remote DR site is 'warm' or even 'hot'.

But I have not been able to find discussions on the relative efficiency of the two approaches. I would imagine that any Hypervisor or SAN based replication needs to replicate ALL the disk writes. That includes the MDF as well as the LDF writes etc., AND any Windows NTFS writes such as the system journal and file attribute structures if the file grows or shrinks. Whereas the SQL methods are really only replicating the resulting DB change, and letting the remote system apply the change.

I would think that the SQL replication could therefore use significantly less network bandwidth between the primary and DR sites.

Does anyone have any experience or opinions here???

Thanks,
Dave



Dan.Humphries
Dan.Humphries
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Group: General Forum Members
Points: 827 Visits: 1212
Not really an opinion but I would highly recommend the product Neverfail for DR. It is in my mind a great product at a fraction of the cost of most other options.

Dan

If only I could snap my figures and have all the correct indexes apear and the buffer clean and.... Start day dream here.
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