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ISM EXAM E20-001 Section 2

Terms in this set (155)

NAS offers the following benefits:
Supports comprehensive access to information: Enables efficient file sharing and supports many-to-one
and one-to-many configurations. The many-to-one configuration enables a NAS device to serve many clients
simultaneously. The one-to-many configuration enables one client to connect with many NAS devices
Improved efficiency: Eliminates bottlenecks that occur during file access from a general-purpose file server
because NAS uses an operating system specialized for file serving. It improves the utilization of generalpurpose
servers by relieving them of file-server operations.
Improved flexibility: Compatible for clients on both UNIX and Windows platforms using industry-standard
protocols. NAS is flexible and can serve requests from different types of clients from the same source.
Centralized storage: Centralizes data storage to minimize data duplication on client workstations, simplify
data management, and ensures greater data protection.
Simplified management: Provides a centralized console that makes it possible to manage file systems
Scalability: Scales well in accordance with different utilization profiles and types of business applications
because of the high performance and low-latency design.
High availability: Offers efficient replication and recovery options, enabling high data availability. NAS
uses redundant networking components that provide maximum connectivity options. A NAS device can use
clustering technology for failover.
Security: Ensures security, user authentication, and file locking in conjunction with industry- standard
security schemas.
Centera has is a RAIN (redundant array of independent nodes) based architecture designed for high scalability
and large content storage. The nodes run a Linux operating system and CentraStar software to implement all the
CAS functionality. Each node contains more than 1 TB of usable capacity and can be configured as access
and/or storage nodes. EMC Centera has two 24-port 2 gigabit internal switches that provide communications for
up to 16 nodes within the private LAN. Several cabinets of these nodes and switches can be connected to form
an EMC Centera cluster. The data protection in a Centera star varies depending on whether it uses content
protection parity (CPP) or content protection mirrored (CPM). In CPP, the data is fragmented into segments,
with an additional parity segment. Each segment is on a different node, similar to a file-type RAID. If a node or a
disk fails, the other nodes regenerate the missing segment on a different node. In CPM, each data object is
mirrored and each mirror resides on a different node. If a node or a disk fails, the EMC Centera software
automatically broadcasts to the node with the mirrored copy to regenerate another copy to a different node so that
two copies are always available. Both CPP and CPM provide total protection against failure using EMC
Centera's unique self-healing functions. With the self-healing feature, if any component in the node or the entire
node fails, data is regenerated to a different part of the cluster, ensuring that data is always protected.