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тАО05-21-2007 07:50 AM
тАО05-21-2007 07:50 AM
We are looking at acquiring a "hot standby" box to keep in sync with production and use for emergencies when the RP7420 is unexpectedly down for more than 2 hours. The platform considered is an RP3440 with 4 x 1GHz cores (2 modules) and 24GB of RAM. Same A6795As and same VA7110 configuration as production.
I know the RP3440 has only 8.5GB/s memory bandwidth compared to 16GB/s for a single cell board in the RP7420. That seems to be the major difference. The question is, given the I/O-bound nature of the load (most of the time), the 11% faster cores, and no vPar overhead in the RP3440, can I expect it to carry the load well enough to keep people from complaining too much?
thanks all...
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тАО05-21-2007 09:17 AM
тАО05-21-2007 09:17 AM
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тАО05-21-2007 09:44 AM
тАО05-21-2007 09:44 AM
Re: Performance - Oracle 9i on different RPxxxx platforms
I'm not a DBA, just the Unix guy, so some of these Oracle things are not familiar to me. You have said "service guard" which I assume is an Oracle thing, but our DBA's have talked about configuring a "data guard broker". Care to give 30 seconds to 'splain the difference, and maybe why we might choose one over the other?
thanks,
Carl
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тАО05-21-2007 09:58 AM
тАО05-21-2007 09:58 AM
Re: Performance - Oracle 9i on different RPxxxx platforms
Here is where SG comes into play. Imagine that your clients do not connect to a host computer but rather to a "package". A packager has resources: IP Address, Disks, and Software -- e.g. a database instance. The package IP address and hostname are virtual and can be moved from host to host automatically. Your clients connect to host "donald" but the virtual hostname "donald" might actually reside on physical hosts "huey", "louie", or "dewey". The clients neither know nor care about which physical host they are actually running on.
Just start here:
http://docs.hp.com/en/ha.html#Serviceguard
I went 5.8 years with zero unplanned downtime on an Oracle-based ERP implementation under SG.
SG is also something nice to have on your resume.
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тАО05-21-2007 10:20 AM
тАО05-21-2007 10:20 AM
Re: Performance - Oracle 9i on different RPxxxx platforms
From a quick peek at Oracle's web site:
Oracle Data Guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect enterprise data from failures, disasters, errors, and corruptions.
http://www.oracle.com/technology/deploy/availability/htdocs/DataGuardOverview.html
Data Guard will keep all the transactions in sync between the primary and standby database. You may be licensed for this already. (It wasn't clear from the web page whether it was part of base Oracle 10g or an additional cost option.)
Although SG is a good thing to have on your resume, as A. Clay stated, I doubt seriously that'd be a selling point to management to go that route. :)
Jeff Traigle
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тАО05-21-2007 10:21 AM
тАО05-21-2007 10:21 AM
Re: Performance - Oracle 9i on different RPxxxx platforms
My architecture will definitely be "two data center" with the two locations connected at 100 Mbps. Any ballpark on the cost of admission to the SG club?
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тАО05-21-2007 10:49 AM
тАО05-21-2007 10:49 AM
Re: Performance - Oracle 9i on different RPxxxx platforms
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тАО05-21-2007 11:04 AM
тАО05-21-2007 11:04 AM
Re: Performance - Oracle 9i on different RPxxxx platforms
One of the main reason to install SG is so that you don't ever use it. You see. by the time, you have nailed all your single points of failure (SPOF's) down, SG itself very seldom comes into play. By the time, you have done this, the cost of the SG software is quite trivial.
Take a very hard look at your network costs because I have seen several cases where it was actually much cheaper to build a new data center closer to one of the existing sites than it was to maintain two existing data centers because over time, network costs tend to swamp everything else if high bandwidth over significant distance is required.
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тАО05-21-2007 11:51 AM
тАО05-21-2007 11:51 AM
Re: Performance - Oracle 9i on different RPxxxx platforms
Years ago I ran VMSclusters over 10Mbps ethernet. Shame I can't make an HP-UX cluster over 100 Mbps....
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тАО05-21-2007 03:55 PM
тАО05-21-2007 03:55 PM
Re: Performance - Oracle 9i on different RPxxxx platforms
Any high availability solution is going to be expensive and database replication and SG are not mutually exclusive. Before you do much of anything, you need to plan very carefully.