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AimThe aim of this study is to explore the heart of the Grid StorageElement There are many storage management middlewares such as dCacheand CASTOR but in this paper we will only focus on Disk Pool ManagerDPM The sole purpose of this investigation is to understand howefficient is to migrate the DPM backend database technologyIntroduction ArchitectureDPM is lightweight middleware software which serves as a storagesolution for Grids As the name indicates that this component willpurely support the disk for storing it cannot support tapes or anyother mediums like the other middleware could do as such as DCACHER andCASTOR As shown in Figure 1 DPM architecture is a database centric itcontains at most two DBs and fairly simple schema There are two nodeson the server side which are known as head node and disk node Thehead node consists of SRM v1 v2 v2 1 DPM DPNS and DBs The DPMdaemon is accountable for handling file access request and monitoringthe state of the request which are stored in the DB The DPM Nameserverdaemon DPNS is liable for handling filedirectory metadata operationwhich is also storedretrieved from DB The Disk Node that holds theactual data which provides the following daemons for data transfersbetween client and disk GRIDFTP RFIO XROOTD and NFS41 The clientinteracts with both head node for metadata operation and disk nodefor data access Figure SEQ Figure ARABIC 1 DPM ArchitectureInvestigation conclusionThe DPM middleware supports many relational databases such as OracleMySQL and PostgreSQL The Oracle is an advance RDBM but its acommercial product therefore it doesnt attract many due to financialfactor so its also discarded in this study for the same reason We areleft with two non-commercial products which are MySQL and PostgreSQLto explore MySQL provides many robust features but our test-bed DPM isalready running on MYSQL Therefore we decided to explore PostgreSQLinstead which provides slightly cutting-edge and more fine-tunedfeatures especially when it comes to performance The key aim of thisstudy
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