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DFS. GOOD FAULT TOLERANCE SOLUTION.

By REZUMA ·
Hi.
I have 15 sites connected with FR.
I have a MS sql server based application which write/read from files in server S1. Last week S1 went down for 120 min so the application did not work for 120 min and my life was miserable for the whole day.
I am trying to setup a fault tolerance system that allows the application keep working even if the server is down. I have done this before with SurviveIT, but I was wondering if I can setup DFS to replicate those file. There will only be one share that would be replicated. This 2 server would be in the same site. The DFS use the AD to replicate am i correct? Somebody told me that when the replication s happening files cant be open, is that true? is DFS a good option for fault tolerance in this case or is not the purpose of that service?

Thanks

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by BFilmFan In reply to DFS. GOOD FAULT TOLERANCE ...

You could use DFS. DFS and AD uses the File Replication Service.

You are correct that Windows 2000 DFS cannot copy open files. This is a known and documented issue. Windows 2003 has the Install Override feature which allows the files to be copied. Details here:

http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B822300

Have you considered SQL server clusters? If a single node failed, then a passive node could take over.

In addition, you could combine SMB Alias shares with clusters for enhanced reliability. Details here on SMB alias shares:

http://support.microsoft.com/default.aspx?scid=kb;en-us;281308

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by Lameei In reply to DFS. GOOD FAULT TOLERANCE ...

mon ami
for fault tolerance(FT) u need to (as i think)setup ft with hard disks.i mean you can use mirror disks.so when u lose 1 of the disks u can the 2nd disk will response automatically.but in the case of a fail in server for SQLdatabase files u can use a domain DFS and for setting it up just got to microsoft technet.com or mail me to get the detailes.
Enjoy

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