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Here in my case we are using domain id as service account for my win 2k3 cluster running for sql db , same domain id is in use for other services and clusters &nbsp;in my environment ? <br />
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Please advice if i can change service account for my one cluster with out any down time ?<br />
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&nbsp;and what if i reset the password for existing one, as i don't know current password for that domain id , so what could be the best way to get this resolved ?<br />
<br />
Thanks
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Here in my case we are using domain id as service account for my win 2k3 cluster running for sql db , same domain id is in use for other services and clusters  in my environment ? 

Please advice if i can change service account for my one cluster with out any down time ?

 and what if i reset the password for existing one, as i don't know current password for that domain id , so what could be the best way to get this resolved ?

Thanks

To change Win 2k3 Cluster servcie account (domin id)

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.