Database cloud storage : the essential guide to Oracle by Nitin Vengurlekar

By Nitin Vengurlekar

"A whole options consultant to Oracle automated garage administration (ASM) and total cloud garage administration. Oracle Cloud garage administration comprises the most recent details at the inner-workings of Oracle ASM and Oracle's total cloud garage administration technique. This Oracle Press advisor explains the best way to construct and deal with a scalable cloud garage infrastructure with Oracle ASM. you are going to how one can configure cloud

"Build and deal with a scalable, hugely on hand cloud garage resolution. packed with designated examples and top practices, this Oracle Press consultant explains how you can manage a whole cloud-based garage procedure utilizing Oracle automated garage administration. how to organize undefined, construct disk teams, successfully allocate space for storing, and deal with defense. Database Cloud garage: the fundamental consultant to Oracle automated garage administration indicates tips to video display your process, maximize throughput, and confirm consistency throughout servers and clusters"- Read more...

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an entire strategies advisor to Oracle Automation garage administration (ASM) and total cloud garage management. Read more...

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Whenever a cluster is reconfigured—either planned or unplanned—overhead is associated with reconfiguring management elements and updating the metadata associated with all the active members of the cluster. Larger clusters, particularly in the enterprise cloud, imply a far greater frequency of cluster reconfiguration events. indd 9 6/4/13 4:24 PM Oracle-Regular / Database Cloud Storage / Vengurlekar & Bagal / 015-2 10 Database Cloud Storage but also to limit the impact to services that might otherwise be affected by a reconfiguration event.

For example, when a user upgrades from 10g to 11gR2, they are allowed to continue storing their OCR/voting files on raw, but at a later convenient time they can migrate these Clusterware files into ASM. It is important to point out that users cannot migrate to Oracle Clusterware 12c from 10g without first moving the voting files into ASM (or shared file system), since raw disks are no longer supported even for upgraded environments in 12c. 2. Before 11gR2, the voting files were located via lookup in OCR; in 11gR2, voting files are located via a Grid Plug and Play (GPnP) query.

If all voting files are corrupted, you can restore them as described next. Furthermore, if the cluster is down and cannot restart due to lost voting files, you must start CSS in exclusive mode to replace the voting files by entering the following command: # crsctl start crs –excl (on one node only) crsctl delete css votedisk voting_disk_guid # crsctl add css votedisk path_to_voting_disk Oracle Cluster Registry (OCR) Oracle Clusterware 11gR2 provides the ability to store the OCR in ASM. Up to five OCR files can be stored in ASM, although each has to be stored in a separate disk group.

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