There are certain event log message when I took SQL server group offline when no body was working for OLAP service . Event Type:Error Event Source:MSSQLServerOLAPService Event Category289) Event ID:10 Date:4/7/2008 Time:9:48:51 AM User:N/A Computer:SQLCLUS Description: Anerror occurred while closing the trace output file,\?F:sqldataMicrosoft SQLServerMSSQL.2OLAPLogFlightRecorderCurrent.trc. Here is another error 21 at the same time for logwriters . Event Type:Error Event Source:MSSQLSERVER Event Category2) Event ID:5159 Date:4/7/2008 Time:9:48:51 AM User:N/A Computer:SQLCLUS Description: Operatingsystem error 21(The device is not ready.) on file "F:sqldataMicrosoftSQL ServerMSSQL.1MSSQLDATAmodellog.ldf" duringCheckLogBlockReadComplete. ------------- Event Type:Error Event Source:MSSQLSERVER Event Category2) Event ID:9001 Date:4/7/2008 Time:9:48:49 AM User:N/A Computer:SQLCLUS Description: Thelog for database 'tempdb' is not available. Check the event log forrelated error messages. Resolve any errors and restart the database. But I can bring the resource online and i get informatonal logs . SQL protocol is named pipes . Further I can create txt file and delete the same on shared storage f: . I can create txt file on f: and delete the same on the same node . Also as explained by u i moved the group to 2nd node and then created / deleted a text file on f:. Further investigations revealed. 1. In the error logs f: is showed as "\f:" something like it .May be path is stored wrong somewhere in registry but it does not show up in cluster administration. Can I check. 2.Advanced property for SQL server network name has 'DNS registration must succeed" unchecked . According to me it must be checked . 3.While installing SQL server group , for specifying the I could not specify the private IP though I have private network configured (in fact there are 2 private network though cluster allows only one to be specified ) . For private network , role is internal communication only . Should it be mixed . 4. Service accounts and cluster admin accounts are different . Do I need to assign any specific path rights to cluster admin for SQL folders .