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08-23-2005 10:32 PM
08-23-2005 10:32 PM
We currently have a two node service-guard cluster. One acts as a primary node and the second server is a pure standby node. We intend to have an offsite DR solution whereby we only recover the primary node. The solution involves restoring the server via an ignite image and then creating the neccesary filesystems on the new external disk etc etc. The problem is obviously the ignite image will bring back the service-guard software. It is my understanding that it will just consider the failover node down and not cause me any issues. I could also in my opinion simply re-boot the server and disable service-guarc from re-starting and then remove the software. Is my thinking correct or would there be a cleaner way of doing this.
Solved! Go to Solution.
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08-23-2005 10:48 PM
08-23-2005 10:48 PM
Re: service-guard and DR
What we do is recover the applications to a single server (slightly tailored install, not ignite) with local filesystems. Creating entries in the hosts file of the DR server to point the packages back to the DR server's IP address.
It is not perfect, it does seem to work though.
Something for you to think about perhaps?
I suppose it depends on your applications and how easy they are to manage without serviceguard.
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08-23-2005 10:49 PM
08-23-2005 10:49 PM
Re: service-guard and DR
Would you clarify whether you are phisically moving your standby node or adding a new node to the cluster, so you have active/standby+dr?
Thks,
Pedro
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08-23-2005 10:56 PM
08-23-2005 10:56 PM
Re: service-guard and DR
I completely forgot about the packages being IP addressable.....one of those days. cheers
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08-23-2005 11:00 PM
08-23-2005 11:00 PM
Re: service-guard and DR
I guess you have a 2 node cluster + a DR server.
Your Idea of igniting the DR server should be fine. But you have to modify the IP address of the DR server to the floating IP of the package. Of course, you can disable cluster from this server.
If the IP is going to be entirely a different one, then you have to test how your application will respond to this change.
Your Idea is doable, but you have to test the DR setup before you actually flag that your DR solution is ready.
With regards,
Mohan.
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08-23-2005 11:55 PM
08-23-2005 11:55 PM
SolutionOK you got clean server and clean disk...Yep, you could ignite the box from the old server, but watch out for software that depends on the server IP for licensing...and your DR server must have it's IP changed (different subnet), then your going to have to address every software that is affected by things such as this. Watch for this cause if your backup software will probably need some tweeking before you can do any restores from tape.
...the whole thing with the IP on your MC/SG package becomes somewhat moot, because your probably not running MC/SG at your DR site based on what I read in your post, so your right, just turn it off.
...so what's left is ensure your software licensing, and software tweeking, for things you must absolutely have is in place (I like the ones that have back doors to extend the license for xx days...so handy till I get a fresh one). Your system files are there from the ignite you did, so your ok there.
.....,,I'm still rambling.......
Anyway, once your box is up at your DR site, your software(s) is working, all you need to do is mkdir the directories, set up your disks, create your vg's/lvols and mount them up. Now start tape restoring...while this is happening mgmt will be stressing cause it's taking too long and affecting business, and this is your golden opportunity to explain to them why it may have been worth it to look at more robust DR solutions......but be careful not to come off like an "I told you so..."
With good planning and depending on the amount of data you may be up in xx days.
Sure that others can think of plenty more,
Rgrds,
Rita
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08-23-2005 11:59 PM
08-23-2005 11:59 PM
Re: service-guard and DR
I'm afraid I can't remember the specifics.
The best way is to think about what might happen and then try it to see what differences there are between what you expected and the reality.
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08-24-2005 12:02 AM
08-24-2005 12:02 AM
Re: service-guard and DR
Cheers all anyway - Rita great Rambling!!!
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08-24-2005 12:10 AM
08-24-2005 12:10 AM
Re: service-guard and DR
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=95626
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=711300
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=768601