Is HA a subset of clustering?
In my opinion, the answer to your question is no.
High Availability (HA) is a design goal; are your systems sufficiently available for them to achieve the goals for which you purchased them? If so, then they are highly available, otherwise they are not. And every application in every enterprise has its own availability requirements. Ebay.com's e-commerce systems are more critical to its operation (and its bottom line) than its development servers, for instance.
Technologies like clustering, mirroring, replication and tape backups are just that, technologies. They are the tools that will enable you to increase your systems' availability to appropriate levels but they themselves are not HA.
I hope this helps. Feel free to follow up if you have additional questions.
Evan L. Marcus
Editor's note: Do you agree with this expert's response? If you have more to share, post it in our .HcX6azlxeJg^0@.ee83ce2!viewtype=&skip=&expand=>Administrator Central discussion forum.
Dig deeper on Primary storage capacity optimization
Related Q&A from Evan Marcus
Storage expert Evan Marcus compares software and hardware RAID and outlines the benefits and drawbacks of each.continue reading
This expert answer explains the purpose of creating LUNs and details reasons for creating multiple LUNs.continue reading
This advice details the hardware and software requirements for setting up two data servers in fail-safe cluster mode for high availability.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.