[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Handle-info] Replication & Handle Administration

Hi Steve:
Yes, a replication server is a redundant resolver. It can not be used for administration as long as it's a secondary. The replication is done between the primary and secondary when the config files have been altered to indicate a secondary is present.
If your primary should go down then you would make your secondary the primary and then you would be able to perform admin tasks on it. This is done by changing the site information in your prefix handle(and you would most likely take the old primary out of the site info so clients don't try it).

On our long list of things-to-do-with-the-Handle-System-when-we-have-time is the concept of a multi-master. This would allow administration on any of the 'masters'.

Thanks
Jane



At 11:56 AM 7/30/2007, Steve wrote:
I am confused about the meaning of handle administration in section 7 "Replication" in the Handle_Technical_Manual.pdf document.

>From the Manual.
7 Replication
The handle server allows for automatic replication of handles to one or more mirror servers. These mirror servers can be used to provide redundancy for resolution or simply as backup for disaster recovery. In sites with multiple servers, handles are distributed evenly across the site. It should be noted that mirror servers cannot be used for handle administration.
When servers are in the same site, the handles for that service are distributed evenly across the site. Mirrors should be able to replicate from either the primary or existing mirrors.

An now some Questions:

Is a mirror server only to be used as a redundant resolver?

What does the statement "In sites with multiple servers, handles are distributed evenly across the site. It should be noted that mirror servers cannot be used for handle administration." mean? Can a mirrored handle server be used to add modify and delete handles an if not then how is it considered a backup for disaster recovery?

In a test I conducted, I added a handle to my secondary server and shortly after doing so the primary server also has the new handle. To me it appears that a secondary or mirrored server can be used for handle administration. Am I wrong in thinking this?, what am I missing?

Thanks.


--
Steve DiSorbo
System Programmer
Yale University ITS, AM&T Library Systems
Voice (203) 432-6694
Fax   (203) 436-4067
<mailto:steve.disorbo@yale.edu>steve.disorbo@yale.edu
http://www.library.yale.edu/



_______________________________________________
Handle-Info mailing list
Handle-Info@cnri.reston.va.us
http://www.handle.net/mailman/listinfo/handle-info