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IDS 11.10 - 30 Sep 2012
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IDS Forum

Re: Implementation of Informix on 3 hdd

Posted By: ANDREW FORD
Date: Tuesday, 30 October 2012, at 9:40 a.m.

In Response To: Re: Implementation of Informix on 3 hdd (MARC SAETTEL)

I'm not even sure if you can make a RAID1 Pair with a physical HDD and a RamDisk. Even if you could, I wouldn't classify this as crash proof, more like a recipe for disaster. Consider this scenario, HDD fails and you replace it and RAID1 starts to rebuild based on mirror in the RamDisk and then you have a power outage, or lose a power supply or someone does a shutdown before the RAID1 can be restored, aren't you totally hosed now?

I don't think there is a server that is 100% crash proof (sure the disks are redundant, but are your power supplies, your NICs, etc. What if someone just makes a mistake and shuts down the wrong server, it happens), but you can make your architecture fully redundant by implementing an HDR Secondary server which is easy to do and requires very little administration. You can even take this a step further and have a 3rd RSS node in a different geographical location in case the data center that holds your Primary and Secondary instances is hit by a natural disaster and 99.99999% uptime is your goal.

I think in your situation, you are best off doing what I said earlier. Put your critical OS filesystems, your Informix logs and Informix data on the RAID1 pair and put your temp dbspaces, filesystems for PSORT_DBTEMP and non critical OS filesystems on the stand alone drive.

When the stand alone drive fails the engine will be crippled (no temp space until the problem is fixed) but it will stay online and none of your data will be lost.

Also be sure to take regular backups and continuously backup the logs in case you need to recover from a total system failure, blah, blah, blah...

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