Manual recovery from a loss of the primary site
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From: SW on 1 Jul 2010 11:16 You could manually restart the cluster service in the disaster site with the /forcequorum switch (http://support.microsoft.com/kb/258078). This could bring the cluster online even if it does not have a majority of nodes. SW AJ wrote: Exchange 2010 Site Resilience 11-Feb-10 Hi Folks I have read all the whitepapers but it still is not clear. Here is what I thought was a simple question, but I dont seem to be able to find a clear answer: Say we have a single DAG with members split across 2 physical sites, lets say 2 members in the primary DC and 1 member in the secondary DC. The FSW is configured to reside in the primary DC (Highest number of users) DAC mode is enabled All DAG members will contain active databases as there will be a couple of hundred users locally based at the second DC. The second DC is not a pure DR site. When the WAN goes down I assume that the active databases at the second DC will go offline because quorom has been lost i.e. only 1 member of the DAG left. My question is how do we stop this behaviour from happening or how do we bring the offline databases back online. Obviously this is extremely undesirable behaviour and it could also be a more than a once in a lifetime event! Would I need to perform a DC *over and activate the alternate FSW? TIA AJ Previous Posts In This Thread: On Thursday, February 11, 2010 5:25 PM AJ wrote: Exchange 2010 Site Resilience Hi Folks I have read all the whitepapers but it still is not clear. Here is what I thought was a simple question, but I dont seem to be able to find a clear answer: Say we have a single DAG with members split across 2 physical sites, lets say 2 members in the primary DC and 1 member in the secondary DC. The FSW is configured to reside in the primary DC (Highest number of users) DAC mode is enabled All DAG members will contain active databases as there will be a couple of hundred users locally based at the second DC. The second DC is not a pure DR site. When the WAN goes down I assume that the active databases at the second DC will go offline because quorom has been lost i.e. only 1 member of the DAG left. My question is how do we stop this behaviour from happening or how do we bring the offline databases back online. Obviously this is extremely undesirable behaviour and it could also be a more than a once in a lifetime event! Would I need to perform a DC *over and activate the alternate FSW? TIA AJ On Friday, February 12, 2010 5:03 PM Mahmoud Magdy wrote: this is an old driven discussion from Exchange 2007, which is where to this is an old driven discussion from Exchange 2007, which is where to store the FSW. FSW could be hosted on the secondary in but if you lost the connectivity to the secondary site then your primary site will be down. the best solution is to pick a third site and create the FSW over there. or recover the FSW, check this article http://www.shudnow.net/2008/11/06/recovering-from-server-2008-ccr-cluster-failure-with-forcequorum/ On Monday, February 15, 2010 9:16 AM AJ wrote: HiThanks for the reply but it does not really answer my question and wedont Hi Thanks for the reply but it does not really answer my question and we dont have a third site. I am using Exchange 2010 and DAG and not Exchange 2007 CCR. Are you saying the commands are the same. I have an alternate FSW already configured. TIA AJ Submitted via EggHeadCafe - Software Developer Portal of Choice WCF Data Services / WCF Behaviors And Server Side Processing http://www.eggheadcafe.com/tutorials/aspnet/7597ebc9-868a-420b-96d0-119d3a501d60/wcf-data-services--wcf-behaviors-and-server-side-processing.aspx |