I am struggling with how to implement this in our enviornment and am hoping you can help.

My team uses a shared SCOM enviornment where we have two servers groups, stored in the same custom management pack, that are used for different alerting purposes. One group is for 7x24 alerting where we want to get paged at all hours of the night for those servers, and the other group is for non-7x24 alerting where we only want alerts during certain times of the day. The caveat is that we only want specific servers in our 7x24 group and are trying to use a combination of dynamic membership AND computers not in the non-7x24 group.

Here is our syntax:

         <MembershipRules>

           <MembershipRule>

             <MonitoringClass>$MPElement[Name="A304a3f11ff204a26baf2d8c642711598!System.Entity"]$</MonitoringClass>

             <RelationshipClass>$MPElement[Name="MicrosoftSystemCenterInstanceGroupLibrary7585010!Microsoft.SystemCenter.InstanceGroupContainsEntities"]$</RelationshipClass>

             <Expression>

               <And>

                 <Expression>

                   <NotContained>

                     <MonitoringClass>$MPElement[Name="UINameSpace090f65ab906f41188efc4d71f59ac31c.Group"]$</MonitoringClass>

                   </NotContained>

                 </Expression>

                 <Expression>

                   <Or>

                     <Expression>

                       <RegExExpression>

                         <ValueExpression>

                           <Property>$MPElement[Name="A304a3f11ff204a26baf2d8c642711598!System.Entity"]/DisplayName$</Property>

                         </ValueExpression>

                         <Operator>ContainsSubstring</Operator>

                         <Pattern>SRVSITE1</Pattern>

                       </RegExExpression>

                     </Expression>

                     <Expression>

                       <RegExExpression>

                         <ValueExpression>

                           <Property>$MPElement[Name="A304a3f11ff204a26baf2d8c642711598!System.Entity"]/DisplayName$</Property>

                         </ValueExpression>

                         <Operator>ContainsSubstring</Operator>

                         <Pattern>SRVSITE9</Pattern>

                       </RegExExpression>

                     </Expression>

                   </Or>

                 </Expression>

               </And>

             </Expression>

           </MembershipRule>

         </MembershipRules>

The names above have been genercised to show that we only want certain servers in the 7x24 group, even if they are not in the non-7x24 group, and not all servers in our enviornment. I thought the syntax of "not in the group" AND "any one of these OR conditions" would work but even after an hour+ the 7x24 group shows 0 members. When I reimport the old management pack it goes back to showing all of the servers the way it did previously.

I think either you can't do what I am trying to do, I shouldn't be storing both groups in the same management pack, or I am not using the syntax correctly. Can you please let me know what you think we should to get this working?

In response to Dan above. You should have both groups in the same management pack for this to work. When using a group for exclusion (non 7x24) you must make sure that you are using the OR group instead of the AND group function. Looking at your management pack XML that you posted it seems that the NotContained expression is in the wrong spot. I put together a full write up on using 7x24 and non 7x24 to exclude a group of objects from another group of objects

Hi Kevin, I know this is an old post, but I was able to successfully implement this. I want to add another group to the "NotContained" but keep getting failures when adding another UIName. Do you have any tips for me to add another UIName?

Thanks

@Eric Bonin - I was struggling to exclude with XML mod and had no issues doing via the GUI option you highlighted. Thanks!