On Tue, 2004-04-27 at 14:42, Tarus Balog wrote: > Gang: > > Okay, I want to make a particular file system highly available. > > For example, suppose, just suppose, I had a directory called > "/var/opennms" that I wanted multiple machines to be able to write to. > So if I had two active machines writing to that file system, and one > died, I'd have a third machine that could come on-line and pick up > where the failed machine left off. > > It has to be fast and reliable (so nothing like NFS). Has anyone worked > with SAN equipment where we could dual attach two or more machines over > SCSI or Fiber Channel? > > How do Linux Clusters handle making data highly available. > > Relevant links and RTFM suggestions welcome.
Hi Tarus,
I'm a "performance guy" (scientific computing), not a "high availability
guy", so please take these comments with a grain of salt.
Our Linux clusters, and in fact the majority of the Linux/Unix clusters
I work on use NFS. And yes, NFS implementations on Linux have been
somewhat flaky in the past but the situation is much better these days.
We're using them on a 24/7 basis and have many more problems from "other
things" (eg. hw failures, power outages) than true NFS problems.
In any case, commercial alternatives include:
Sistina:
http://www.sistina.com/home.html
IBM's GPFS:
http://www-1.ibm.com/servers/eserver/clusters/software/gpfs.html
and, AFAIK, Coda and InterMezzo aren't "there yet" and OpenAFS is only
available for older kernels.
Good luck!
Ed
--
Edward H. Hill III, PhD
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