Mirroring Large Amounts Of Databases

Mar 6, 2008

I have been looking into mirroring a large amount of small databases approx 150 databases.



As I understand this won't be feasible because of the way mirroring threading works, http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=441900&SiteID=1



As I understand it for every database being mirrored sql will ping the mirror second, causing a network bottleneck?.

Also that the amount of threads generated for each mirrored database will cause also cause a bottleneck?



At the moment our database servers are under very little pressure and as an estimate use about 10% of the resources allocated to them such as CPU utilization, memory, disk IO and network. Our server hardware is Dual Quad core Xeons with 4 - 8 gig of memory and variety of 10k SCSCI raid configurations from raid 5 or 1,0 and sql 2005 32bit.



Ive done some calculations on the log file generation rate compared to network bandwidth there is more than enough network bandwidth.



Has anybody had any luck in mirroring many small databases?



My concerns is how much traffic is caused by the pinging of the mirror for each database?,

How many threads will the mirroring cause and what is the max amount of threads sql can handle?

How much memory will be consumed by each one of these mirroring threads?

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I am trying to enable database mirroring for 100 database.
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p.s. my email was incorrect in the last mail.
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