CELLSRV: Is a multithreaded server. The primary Exadata Storage software component and provides the majority of Exadata storage services. It communicates with Oracle Database to serve simple block requests like database buffer cache reads and Sart Scan requests like tablespaces with projections and filters. CELLSRV also implements I/ORM and collect statistics relating to its operation.
MS: provides Exadata cell management and configuration. It works with CellCLI. It also responsible for sending alerts and collects some statistics in addition to those collected by CELLSRV.
Restart Server (RS) is used to startup / shutdown the Cell Server (CELLSRV) and Management server (MS). It also monitors these services to check whether they need to be restarted.
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