We are currently evaluating a number of high availability products (including Veritas clustering solutions) and...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
would like to know if there are any other technologies out there as an alternative solution to clustering. Thanks.
The answer to your question is a simple one, actually. It depends. There are other technologies besides clustering that can give you high availability but it depends on what you are trying to accomplish, what types of failures you want to protect against, how high a level of availability you are trying to achieve and what your critical applications are.
For most applications, if you want to protect against a system crash, a hardware failure or some other system-wide failure, there is nothing better than failover and clustering. However, for some applications there are better technologies.
If you are putting up a Web site with a database back end for instance, the database should probably be clustered. But for the Web servers there are other technologies such as round robin DNS or redirectors like Hydra's Hydra Web, Cisco's Local Director or Veritas' Cluster Server Traffic Director. Both technologies are better than clustering at recovering from the failure of a single server, and at redirecting client requests to different hosts.
Your choice of technologies will also depend on the level of availability you need. If you are only concerned about protecting the data and not achieving high levels of uptime, then mirroring and backups are sufficient. If you are concerned about a site outage, then local clustering will not be sufficient, and you'll probably want to consider replication to a disaster recovery site. It has been my position for quite some time that high availability is what you need it to be; it's the level of availability that allows your critical systems to achieve the goals that you purchased them for in the first place. Only you know if those goals require backups, mirrored disks, clustering, or replication. And different systems have different levels of requirements.
I hope this is helpful. Please follow up if you have other 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.
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.