Oracle Automatic Storage Management For 10G And 11G -370P, by Nitin Vengurlekar, Murali Vallath, Rich Long

By Nitin Vengurlekar, Murali Vallath, Rich Long

Construct and deal with a scalable garage infrastructure with Oracle automated garage Management
Streamline facts administration and provisioning utilizing Oracle automated garage administration (Oracle ASM) and the unique info contained during this specific Oracle Press source. Written through a group of database specialists, Oracle computerized garage administration: Under-the-Hood & functional Deployment advisor explains the right way to construct and continue a dynamic, hugely on hand Oracle database garage surroundings. inside of, you will the right way to configure garage for Oracle ASM, construct disk teams, use info striping and mirroring, and optimize functionality. you will additionally the right way to determine consistency throughout server and garage systems, maximize info redundancy, and administer Oracle ASM from the command line.
- deal with Oracle ASM cases and configure Oracle RDBMS cases to leverage Oracle ASM
- outline, observe, and deal with disk garage less than Oracle ASM
- Create exterior, normal-redundancy, and high-redundancy disk groups
- upload and take away Oracle ASM garage with out affecting RDMS example availability
- learn the way Oracle ASM offers even I/O distribution
- paintings with Oracle ASM directories, documents, templates, and aliases
- increase garage functionality and integrity utilizing the ASMLIB API
- Simplify method management with the Oracle ASM command line interface
- comprehend key inner Oracle ASM buildings and algorithms

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The NAS OS has enhanced file-level security. ■ NAS devices can front end a SAN. When a NAS device is used in this context, it is called NAS Gateway (or NAS Head). The advantage of NAS Gateways is that they provide the accessibility of NAS along with the backend storage scalability of SAN. With NAS Gateways, logical unit numbers (LUNs) are presented and “percolated” from the SAN to the NAS device; the NAS can either aggregate these LUNs (or present them as is) as a network filesystem. NAS has the following strengths: ■ It is relatively inexpensive.

The following describes the layers in greater detail: ■ The upper layer, FC-4, establishes the interface between the FC transport and upper-level applications and operating system. For storage applications, FC-4 is responsible for mapping the SCSI-3 protocol for transactions between host initiators and storage targets. 17 18 Oracle Automatic Storage Management FC Layer Layer Title Comments FC-4 Upper-layer protocol interface Encapsulation of other protocols such as SCSI-3, IP, VI, HIPPI, and so on FC-3 Common services Services for multiple ports on one node FC-2 Data delivery Framing, flow control, sequence management, exchange management, service class, topologies, and segmentation FC-1 Ordered sets/bytes encoding 8b/10b encoding and link controls FC-0 Physical interface Signaling, media specifications, receive/ transmitter specifications, optical electrical, and cable plant TABLE 1-1.

This cache hit block is returned through the fabric and eventually to the application, all without requiring physical disk access (which as we discussed earlier is the slowest part of the I/O subsystem). The cache controller is also responsible for providing prefetch of data blocks for sequentially accessed data. If the cache controller determines that the application is accessing contiguous disk blocks, the prefetch algorithms are triggered (set with thresholds) to prefetch data that are stored in the read cache, providing significant improvement into access time.

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