Continuing the previous posts about "Battle between "Gut-feeling" and Engineering." ....
Engineer 2: Igor - if you would like to find further extensions of your equation, you might check out Volume 1 of "Breaking the Availability Barrier," which I co-authored and which is available on Amazon. Also, check out several papers I published in the Availability Digest in the Geek Corner (http://www.availabilitydigest.com/articles.htm). A subscription is free.
Engineer 2: Igor - if you would like to find further extensions of your equation, you might check out Volume 1 of "Breaking the Availability Barrier," which I co-authored and which is available on Amazon. Also, check out several papers I published in the Availability Digest in the Geek Corner (http://www.availabilitydigest.com/articles.htm). A subscription is free.
Igor Trubin: Yes, I have already looked briefly at your
book and referenced it in my blog, Very good book and I plan to read
that all.
UPDATE: After reading one of suggested above papers ( "Calculating
Availability - Redundant Systems"
Some useful
rules come out of the derivation of the availability equation.) I was able to show to my client that the following more general cluster (system) availability formula proves that for three-node cluster (n=3) the one spare node (s=1) configuration could provide approximately the same cluster availability as in the case of two spare nodes (s=2) but Capacity usage could be a critical factor as seen below.
That could be a way to save money by allocating less capacity with the same number but more reliable nodes.
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